1,721,046 research outputs found
Low-energy Electron Scattering By N2, P2, As2 And Sb2
No full textWe report elastic integral, momentum transfer and differential cross sections from 10-30 eV for electron scattering by X2 (X = N, P, As, Sb). These results were obtained at the static-exchange approximation with the Schwinger Multichannel Method with Pseudopotentials [M H F Bettega, L G Ferreira and M A P Lima 1993 Phys. Rev. A 47 1111]. Our results for N2 are in good agreement with experimental data. We also compare our results with previous calculations on XH3 (X = P, As, Sb) [M H F Bettega, M A P Lima and L G Ferreira 1996 J. Chem. Phys. 105 1029] and found, as expected, that the X2 cross sections are larger than the corresponding XH3 cross sections.31920912099Yarkony, D.R., (1995) Modern Electronic Structure Theory, , Singapore: World Scientific chaps 9 and 22Garscadden, A., (1992) Z. Phys. D, 24, p. 99Huo, W.M., Gianturco, F.A., (1995) Computational Methods for Electron-Molecule Collisions, , New York: PlenumBachelet, G., Hamann, D.R., Schlüter, M., (1982) Phys. Rev. B, 46, p. 4199Takatsuka, K., McKoy, V., (1981) Phys. Rev. A, 24, p. 2473Takatsuka, K., McKoy, V., (1984) Phys. Rev. A, 30, p. 1734Bettega, M.H.F., Ferreira, L.G., Lima, M.A.P., (1993) Phys. Rev. A, 47, p. 1111Natalense, A.P.P., Bettega, M.H.F., Ferreira, L.G., Lima, M.A.P., (1995) Phys. Rev. A, 52, pp. R1Bettega, M.H.F., Natalense, A.P.P., Lima, M.A.P., Ferreira, L.G., (1995) J. Chem. Phys., 103, p. 10566Natalense, A.P.P., Sartori, C.S., Ferreira, L.G., Lima, M.A.P., (1996) Phys. Rev. A, 54, p. 5435Do Varella, M.T.N., Bettega, M.H.F., Lima, M.A.P., (1997) Z. Phys. D, 39, p. 59Rescigno, T.N., (1996) J. Chem. Phys., 104, p. 125Rescigno, T.N., McCurdy, C.W., (1996) J. Chem. Phys., 104, p. 120Trajmar, S., Register, D.F., Chutjian, A., (1983) Phys. Rep., 97, p. 219Lane, N.F., (1980) Rev. Mod. Phys., 52, p. 29Huo, W.M., Gibson, T.L., Lima, M.A.P., McKoy, V., (1987) Phys. Rev. A, 36, p. 1632Pfingst, K., Nestmann, B.M., Peyerimhoff, S., (1994) J. Phys. B: At. Mol. Opt. Phys., 27, p. 2283Lima, M.A.P., Brescansin, L.M., Da Silva, A.J.R., Winstead, C., McKoy, V., (1990) Phys. Rev. A, 41, p. 327Bettega, M.H.F., Natalense, A.P.P., Lima, M.A.P., Ferreira, L.G., (1996) Int. J. Quantum Chem., 60, p. 821Srivastava, S.K., Chutjian, A., Trajmar, S., (1976) J. Chem. Phys., 64, p. 1340Shyn, T.W., Carignan, G.R., (1980) Phys. Rev. A, 22, p. 923Finn, T.G., Doering, J.P., (1975) J. Chem. Phys., 63, p. 4399Bettega, M.H.F., Lima, M.A.P., Ferreira, L.G., (1996) J. Chem. Phys., 105, p. 102
The Influence Of F-type Function In Positron-he/positron-h2 Scattering With The Schwinger Multichannel Method
No full textIn this paper we present results for positron-Helium and positron-H2 scattering with the inclusion of the f-type Cartesian Gaussian functions in our computer codes of the Schwinger multichannel method (SMC). The effects of this modification can be noticed in the integral cross-section for both studied targets, with our new curves being closer to the most recent experimental measurements. The inclusion of the f-type function in the scattering wave function expansion also helped us to obtain a better set of results with the SMC method for the annihilation parameter. Data for differential cross-section (DCS) for helium is presented as well as our improvement in the DCS data in the forward scattering angles for the hydrogen molecule. © 2007 Elsevier B.V. All rights reserved.2663447451Surko, C.M., Gribakin, G.F., Buckman, S.J., (2005) J. Phys. B, 38, pp. R57Sullivan, J.P., (2002) Nucl. Instr. and Meth. B, 192 (3)J.P. Sullivan et al., Absolute differential cross-section for positron scattering from helium, in: J. Walters, N.J. Mason (Eds.), Mason Programme and Book of Abstracts of the XIV International Workshop on Low Energy Positron and Positronium Physics, 2007Van Reeth, P., Humberston, J.W., (1999) J. Phys. B: At. Mol. Phys., 32, p. 3651Wu, H., Bray, I., Fursa, D.V., Stelbovics, A.T., (2004) J. Phys. B: At. Mol. Phys., 37, pp. L1Gibson, T.L., (1992) J. Phys. B: At. Mol. Opt. Phys., 25, p. 1321Armour, E.A.G., Baker, D.J., Plummer, M., (1990) J. Phys. B: At. Mol. Opt. Phys., 23, p. 3057Danby, G., Tennyson, J., (1990) J. Phys. B: At. Mol. Opt. Phys., 23, p. 1005Germano, J.S.E., Lima, M.A.P., (1993) Phys. Rev. A, 47, p. 3976C de Carvalho, C.R., Varella, M.T.d.N., Lima, M.A.P., da Silva, E.P., Germano, J.S.E., (2000) Nucl. Instr. and Meth. B, 171, p. 33C de Carvalho, C.R., Varella, M.T.d.N., Lima, M.A.P., da Silva, E.P., (2003) Phys. Rev. A, 67, p. 062706Varella, M.T.d.N., de Carvalho, C.R.C., Lima, M.A.P., (2002) Nucl. Instr. and Meth. B, 192, p. 225Mizogawa, T., Nakayama, Y., Kawaratani, T., Tosaki, M., (1985) Phys. Rev. A, 31, p. 2171Karwasz, G.P., Pliszka, D., Zecca, A., Brusa, R.S., (2005) Nucl. Instr. and Meth. B, 240 (3), p. 666Murphy, T.J., Surko, C.M., (1991) Phys. Rev. Lett., 67, p. 2954Mitroy, J., (2005) Phys. Rev. A, 72, p. 062707Lino, J.L.S., Germano, J.S.E., da Silva, E.P., Lima, M.A.P., (1998) Phys. Rev. A, 58 (5)Hoffman, K.R., (1982) Phys. Rev. A, 25, p. 1393Zhou, S., Li, H., Kauppila, W.E., Kwan, C.K., Stein, T.S., (1997) Phys. Rev. A, 55, p. 361G.P. Karwasz, private communications, 2007Karwasz, G.P., (2005) Eur. Phys. J. D, 35, p. 267Armour, E.A.G., Plummer, M., Shimamura, I., (1994) Hyperfine Interact., 89, p. 309M.T. do N. Varella, E.M. de Oliveira, M.A.P. Lima, Near-threshold vibrational excitation of molecules by positron impact: a projection operator approach, in: J. Walters, N.J. Mason (Eds.), Programme and Book of Abstracts of the XIV International Workshop on Low Energy Positron and Positronium Physics, 2007Stepanek, J., (2003) Rad. Phys. Chem., 66, p. 9
Electronic Excitation Of Xh4 (x=c,si,ge,sn,pb) By Electron Impact
No full textWe calculate integral cross sections for the electronic excitation to the 3T2 states of XH4 (X=C,Si,Ge,Sn,Pb) by electron impact. This is the lowest-lying excited state of these molecules. Our results were obtained with the Schwinger multichannel method with pseudopotentials at the two-state level of approximation. In the case of CH4 we compare our results with previous results of an all-electron calculation obtained at the same level of approximation, in which case we found an excellent agreement between the two calculations. Though these molecules are very similar, after discarding the cores, as the pseudopotential technique does, the inelastic cross sections are very distinctive and do not have a monotonic behavior with increasing proton number Z of the central atom.57649874990Takatsuka, K., McKoy, V., (1981) Phys. Rev. A, 24, p. 2473(1984) Phys. Rev. A, 30, p. 1734Bettega, M.H.F., Ferreira, L.G., Lima, M.A.P., (1993) Phys. Rev. A, 47, p. 1111Rescigno, T.N., McCurdy, C.W., (1996) J. Chem. Phys., 104, p. 120Rescigno, T.N., (1996) J. Chem. Phys., 104, p. 125Bachelet, G., Hamann, D.R., Schlüter, M., (1982) Phys. Rev. B, 26, p. 4199Winstead, C., Sun, Q., McKoy, V., Lino, J.L.S., Lima, M.A.P., (1993) J. Chem. Phys., 98, p. 2132Winstead, C., Pritchard, H.P., McKoy, V., (1994) J. Chem. Phys., 101, p. 338Gil, T.L., Lengsfiel, B.H., McCurdy, C.W., Rescigno, T.N., (1994) Phys. Rev. A, 49, p. 2551Lima, M.A.P., Brescansin, L.M., Da Silva, A.J.R., Winstead, C., McKoy, V., (1990) Phys. Rev. A, 41, p. 327Bettega, M.H.F., Natalense, A.P.P., Lima, M.A.P., Ferreira, L.G., (1996) Int. J. Quantum Chem., 60, p. 821Goddard III, W.A., Hunt, W.J., (1974) Chem. Phys. Lett., 24, p. 464Bettega, M.H.F., Natalense, A.P.P., Lima, M.A.P., Ferreira, L.G., (1995) J. Chem. Phys., 103, p. 10566Brongersma, H.H., Oosterhoff, L.J., (1969) Chem. Phys. Lett., 3, p. 437Curtis, M.G., Walker, I.C., (1989) J. Chem. Soc., Faraday Trans., 85, p. 65
Elastic Cross Sections And Annihilation Parameter For E+-h2 Scattering Using The Schwinger Multichannel Method
No full textWe report detailed results for positron-H2 collisions obtained with the Schwinger multichannel method. Our calculations include annihilation parameter, differential, integral, and momentum transfer cross sections for energies below the positronium formation threshold. The calculations were carried out in the static-pluspolarization approximation with symmetry-resolved cross sections. Energy (temperature) dependence and symmetry-resolved contributions for the annihilation parameter Zeff are also reported. Our ab initio integral cross sections are found to be in good agreement with the experimental data.58535023506Stein, T.S., Harte, M., Jiang, J., Kauppila, W.E., Kwan, C.K., Li, H., Przybyla, D.A., Zhou, S., unpublishedPrzybyla, D.A., (1997) Phys. Rev. A, 55, p. 4244Murphy, T.J., Surko, C.M., (1991) Phys. Rev. Lett., 67, p. 2954Laricchia, G., (1995) The Physics of Electronic and Atomic Collisions, p. 385. , edited by L. J. Dube, B. A. Mitchell, W. McConkey, and E. Brion, AIP Conf. Proc. No. 360 AIP, New YorkDay, D.J., Larricchia, G., Charlton, M., (1992) Hyperfine Interact., 73, p. 2017Danby, G., Tennyson, J., (1990) J. Phys. B, 23, p. 1005(1990) J. Phys. B, 23, p. 2471McCurdy, C.E., Rescigno, T.N., Schneider, B.I., (1987) Phys. Rev. A, 36, p. 2061Gibson, T.L., (1992) J. Phys. B, 25, p. 1321Germano, J.S.E., Lima, M.A.P., (1993) Phys. Rev. A, 47, p. 3976Lino, J.L.S., Germano, J.S.E., Lima, M.A.P., (1994) J. Phys. B, 27, p. 1881Da Silva, E.P., Germano, J.S.E., Lima, M.A.P., (1994) Phys. Rev. A, 49, pp. R1527Da Silva, E.P., Germano, J.S.E., Lima, M.A.P., (1996) Phys. Rev. Lett., 77, p. 1028Takatsuka, K., McKoy, V., (1981) Phys. Rev. A, 24, p. 2473Kolos, W., Wolniewicz, L., (1965) J. Chem. Phys., 43, p. 2429Charlton, M., Griffith, T.C., Heyland, G.R., Wright, G.L., (1983) J. Phys. B, 16, p. 323Armour, E.A.G., Plummer, M., (1990) J. Phys. B, 23, p. 3057Hoffman, K.R., Dababneh, M.S., Hsieh, Y.F., Kauppila, W.E., Pol, V., Smart, J.H., Stein, S., (1982) Phys. Rev. A, 25, p. 1393Da Silva, E.P., Germano, J.S.E., Lino, J.L.S., Carvalho, C.R.C., Natalense, A.P.P., Lima, M.A.P., (1998) Nucl. Instrum. Methods Res. B, 143, p. 14
Low-energy Positron Scattering By Co2
Get PDFIn this work we present results of integral (ICS) and differential (DCS) cross sections for positron- CO2 scattering at low incident energies. Our ICS shows a significant improvement toward the experimental data, especially below 2 eV, and all the way up to the positronium formation threshold (7.8 eV), in comparison to our previous calculations. Our calculated DCSs show a better resemblance in shape with the quasielastic experimental points of the Detroit group, but the agreement is still not fully satisfactory, indicating a need for further theoretical and experimental investigation. © 2008 The American Physical Society.775Wahl, R.L., (2002) Principles and Practice of Positron Emission Tomography, , Lippincott, Williams and Wilkins, PhiladelphiaGuessoum, N., Ramaty, R., Lengenfeltter, R.E., (1991) Astrophys. J., 378, p. 170. , ASJOAB 0004-637X 10.1086/170417Surko, C.M., Gribakin, G.F., Buckman, S.J., (2005) J. Phys. B, 38, p. 57. , JPAPEH 0953-4075 10.1088/0953-4075/38/6/R01Germano, J.S.E., Lima, M.A.P., (1993) Phys. Rev. A, 47, p. 3976. , PLRAAN 1050-2947 10.1103/PhysRevA.47.3976Da Silva, E.P., Germano, J.S.E., Lima, M.A.P., (1994) Phys. Rev. A, 49, p. 1527. , PLRAAN 1050-2947 10.1103/PhysRevA.49.R1527Arretche, F., Da Costa, R.F., D'A. Sanchez, S., Hisi, A.N.S., De Oliveira, E.M., Do Varella N, M.T., Lima, M.A.P., (2006) Nucl. Instrum. Methods Phys. Res. B, 247, p. 13. , NIMBEU 0168-583X 10.1016/j.nimb.2006.01.032De Carvalho, C.R.C., Do Varella N, M.T., Lima, M.A.P., Da Silva, E.P., Germano, J.S.E., (2000) Nucl. Instrum. Methods Phys. Res. B, 171, p. 33. , NIMBEU 0168-583X 10.1016/S0168-583X(00)00036-7D'A. Sanchez, S., Arretche, F., Do Varella N, M.T., Lima, M.A.P., (2004) Phys. Scr., 110, p. 276. , PHSTBO 0031-8949 10.1238/Physica.Topical.110a00276Hoffman, K.R., Dababneh, M.S., Hsieh, Y.-F., Kauppila, W.E., Pol, V., Smart, J.H., Stein, T.S., (1982) Phys. Rev. A, 25, p. 1393. , PLRAAN 1050-2947 10.1103/PhysRevA.25.1393Przybyla, D.A., Addo-Asah, W., Kaupilla, W.E., Kwan, C.K., Stein, T.S., (1999) Phys. Rev. A, 60, p. 359. , PLRAAN 1050-2947 10.1103/PhysRevA.60.359Bettega, M.H.F., Winstead, C., McKoy, V., (2006) Phys. Rev. A, 74, p. 022711. , PLRAAN 1050-2947 10.1103/PhysRevA.74.022711Rescigno, T.N., Byrum, D.A., Isaacs, W.A., McCurdy, C.W., (1999) Phys. Rev. A, 60, p. 2186. , PLRAAN 1050-2947 10.1103/PhysRevA.60.2186Winstead, C., McKoy, V., (1998) Phys. Rev. A, 57, p. 3589. , PLRAAN 1050-2947 10.1103/PhysRevA.57.3589Chaudhuri, P., Do Varella N, M.T., De Carvalho, C.R.C., Lima, M.A.P., (2004) Phys. Rev. A, 69, p. 042703. , PLRAAN 1050-2947 10.1103/PhysRevA.69.042703Lee, C.H., Winstead, C., McKoy, V., (1999) J. Chem. Phys., 111, p. 5056. , JCPSA6 0021-9606 10.1063/1.479761Kroin, T., Michelin, S.E., Mazon, K.T., Almeida, D.P., Lee, M.T., (1999) J. Mol. Struct.: THEOCHEM, 464, p. 49. , THEODJ 0166-1280 10.1016/S0166-1280(98)00534-XGianturco, F.A., Paioletti, P., (1997) Phys. Rev. A, 55, p. 3491. , PLRAAN 1050-2947 10.1103/PhysRevA.55.3491(1997) CRC Handbook of Chemistry and Physics, , 78th ed., edited by David R. Lide (CRC, Boca RatonSueoka, O., Hamada, A., (1993) J. Phys. Soc. Jpn., 62, p. 2669. , JUPSAU 0031-9015 10.1143/JPSJ.62.2669Zecca, A., Perazzolli, C., Moser, N., Sanyal, D., Chakrabarti, M., Brunger, M.J., (2006) Phys. Rev. A, 74, p. 012707. , PLRAAN 1050-2947 10.1103/PhysRevA.74.012707Morrison, M.A., (1982) Phys. Rev. A, 25, p. 1445. , PLRAAN 1050-2947 10.1103/PhysRevA.25.144
25-state Calculation For E--na2 Scattering
No full textWe use the Schwinger multichannel method with pseudopotentials to study low energy e--Na2 scattering. Our cross sections, for impact energies from 0 to 10 eV, include polarization effects and up to 25 open channels related to all electronic states lying below 3.5 eV. Our results predict prominent threshold effects due to a very intense coupling between the B1Πu state and the elastic channel in an energy region where there is no experimental data. Our total 25-state cross sections are in very good agreement with available experimental data for energies below about 4 eV.811838323835Takatsuka, K., McKoy, V., (1981) Phys. Rev. A, 24, p. 2473(1984) Phys. Rev. A, 30, p. 1734Sun, Q., Winstead, C., McKoy, V., (1992) Phys. Rev. A, 46, p. 6987. , and references thereinBettega, M.H.F., Ferreira, L.G., Lima, M.A.P., (1993) Phys. Rev. A, 47, p. 1111Natalense, A.P.P., Bettega, M.H.F., Ferreira, L.G., Lima, M.A.P., (1995) Phys. Rev. A, 52, pp. R1Bettega, M.H.F., Natalense, A.P.P., Lima, M.A.P., Ferreira, L.G., (1995) J. Chem. Phys., 103, p. 10566Li-Li, Rice, S.F., Field, R.W., (1985) J. Chem. Phys., 82, p. 1178Kolos, W., Wolniewicz, L., (1965) J. Chem. Phys., 43, p. 2419McHugh, K.M., Eaton, J.G., Lee, G.H., Sarkas, H.W., Kidder, L.H., Snodgrass, J.T., Manaa, M.R., Bowen, K.H., (1989) J. Chem. Phys., 91, p. 3792Lima, M.A.P., Gibson, T.L., McKoy, V., Huo, W.M., (1988) Phys. Rev. A, 38, p. 4527Kaldor, U., (1991) Isr. J. Chem., 31, p. 345Ceperley, D.M., Alder, B.J., (1980) Phys. Rev. Lett., 45, p. 566Bachelet, G.B., Hamann, D.R., Schlüter, M., (1982) Phys. Rev. B, 26, p. 4199Bettega, M.H.F., Natalense, A.P.P., Lima, M.A.P., Ferreira, L.G., (1996) Int. J. Quantum Chem., 60, p. 821Goddard III, W.A., Hunt, W.J., (1974) Chem. Phys. Lett., 24, p. 464Huber, K.P., Herzberg, G., (1979) Molecular Spectra and Molecular Structure IV. Constants of Diatomic Molecules, p. 432. , Van Nostrand Reinhold, TorontoBranchett, S.E., Tennyson, J., (1990) Phys. Rev. Lett., 64, p. 2889Sun, Q., Winstead, C., McKoy, V., (1992) Phys. Rev. A, 46, p. 6987Gil, T.J., Lengsfield, B.H., McCurdy, C.W., Rescigno, T.N., (1994) Phys. Rev. A, 49, p. 2551Trail, W.K., Morrison, M.A., Zhou, H.-L., Whitten, B.L., Bartschat, K., MacAdam, K.B., Goforth, T.L., Norcross, D.W., (1994) Phys. Rev. A, 49, p. 3620Miller, T.M., Kasdan, A., (1973) J. Chem. Phys., 59, p. 3913Bray, I., (1994) Phys. Rev. A, 49, p. 106
Electronic Excitation Of H2 By Electron Impact Using Soft Norm-conserving Pseudopotentials
Get PDFWe calculate electronic excitation cross sections for the b 3∑u + a 3∑g + c 3∏u, and d 3∏u states of H2 by electron impact. Our results were obtained with the Schwinger multichannel method with pseudopotentials and real potentials at the two-channel level of approximation. Pseudo-H atoms are used to generate H2 molecules with almost the same low-energy spectrum as the real molecules. We show that the dynamics of the electronic excitation process of the pseudomolecules by electron impact is very similar to the real case. Our results support the idea that pseudopotentials can be used to obtain reliable molecular electronic excitation cross sections by low-energy electron impact, confirming the expectations of previous studies with CH2O and HBr.54654355437Takatsuka, K., McKoy, V., (1981) Phys. Rev. A, 24, p. 2473(1984) Phys. Rev. A, 30, p. 1734Bettega, M.H.F., Ferreira, L.G., Lima, M.A.P., (1993) Phys. Rev. A, 47, p. 1111Natalense, A.P.P., Bettega, M.H.F., Ferreira, L.G., Lima, M.A.P., (1995) Phys. Rev. A, 52, pp. R1Bettega, M.H.F., Natalense, A.P.P., Lima, M.A.P., Ferreira, L.G., (1995) J. Chem. Phys., 103, p. 10566Rescigno, T.N., McCurdy, C.W., (1996) J. Chem. Phys., 104, p. 120Rescigno, T.N., (1996) J. Chem. Phys., 104, p. 125Hamann, D.R., Schlüter, M., Chiang, C., (1979) Phys. Rev. Lett., 43, p. 1494Christiansen, P.A., Lee, Y.S., Pitzer, K.S., (1979) J. Chem. Phys., 71, p. 4445Topp, W.C., Hopfield, J.J., (1973) Phys. Rev. B, 7, p. 1295Bachelet, G.B., Hamann, D.R., Schlüter, M., (1982) Phys. Rev. B, 26, p. 4199Bettega, M.H.F., Natalense, A.P.P., Lima, M.A.P., Ferreira, L.G., (1996) Int. J. Quantum Chem., 60, p. 821Goddard III, W.A., Hunt, W.J., (1974) Chem. Phys. Lett., 24, p. 464Kolos, W., Wolniewicz, L., (1965) J. Chem. Phys., 43, p. 2429Kolos, W., Wolniewicz, L., (1968) J. Chem. Phys., 48, p. 3672Browne, J.C., (1964) J. Chem. Phys., 40, p. 43Lee, M.T., Machado, L.E., Brescansin, L.M., Meneses, G.D., (1991) J. Phys. B, 24, p. 509Lima, M.A.P., Gibson, T.L., McKoy, V., Huo, W.M., (1988) Phys. Rev. A, 38, p. 4527. , and references cited therei
Positron Impact Electronic Excitation Of N2
No full textWe present the results of scattering cross sections for positron impact excitation of electronic states of nitrogen molecule (N2) using the Schwinger multichannel method (SMC). All calculated cross sections took three collision channels into account (X1Σg and degenerate a1Πg states). Present theoretical results for excitation to the a1Πg states failed to reproduce the near-threshold structure observed in the recent and the only available experimental data [Sullivan et al., Phys. Rev. Lett. 87 (2001) 073201-1]. Scattering calculations from the a1Πg states (elastic and superelastic) are also reported. A spurious resonant structure found in the excitation to the a1Πg states was detected in a square integrable basis set calculation designed to reproduce the first Born approximation (FBA). Such spurious structure was removed by taking out the trial configuration state functions in which the positron was weakly coupled to the target. This may be a promising technique to separate unphysical resonances from the physical ones. We also observe that a combination between SMC scattering amplitudes (l≤2) with FBA ones (l≥3) significantly improved the cross sections at higher energies. © 2004 Elsevier B.V. All rights reserved.2211-46975Gilbert, S.J., Sullivan, J.P., Greaves, R., Surko, C.M., (2000) Nucl. Instr. and Meth. B, 171, p. 81Sullivan, J.P., Marler, J.P., Gilbert, S.J., Buckman, S.J., Surko, C.M., (2001) Phys. Rev. Lett., 87, pp. 073201-073211Sullivan, J.P., Gilbert, S.J., Surko, C.M., (2001) Phys. Rev. Lett., 86, p. 1494Surko, C.M., (2001) New Directions in Antimatter Chemistry and Physics, p. 345. , Kluwar Academic PublishersMurphy, T.J., Surko, C.M., (1992) Phys. Rev. A, 46, p. 5695Greaves, R.G., Tinkle, M.D., Surko, C.M., (1994) Phys. Plasmas, 1, p. 1439Germano, J.S.E., Lima, M.A.P., (1993) Phys. Rev. A, 47, p. 3976Da Silva, E.P., Germano, J.S.E., Lima, M.A.P., (1994) Phys. Rev. A, 49, pp. R1527Da Silva, E.P., Germano, J.S.E., Lima, M.A.P., (1996) Phys. Rev. Lett., 77, p. 1028Da Silva, E.P., Germano, J.S.E., Lino, J.L.S., De Carvalho, C.R.C., Natalense, A.P.P., Lima, M.A.P., (1998) Nucl. Instr. and Meth. B, 143, p. 140De Carvalho, C.R.C., Varella, M.T.D.N., Da Silva, E.P., Germano, J.S.E., Lima, M.A.P., (2000) Nucl. Instr. and Meth. B, 171, p. 33Hunt, W.J., Goddard III, W.A., (1974) Chem. Phys. Lett., 24, p. 464Sullivan, J.P., Gilbert, S.J., Buckman, S.J., Surko, C.M., (2001) J. Phys. B, 34, pp. L467Bromley, M.W.J., Mitroy, J., (2003) Phys. Rev. A, 67, p. 062709Rescigno, T.N., (2003), private communicationSzabo, A., Ostlund, N.S., (1989) Modern Quantum Chemistry: Introduction to Advanced Electronic Structure Theory, , New York: McGraw-Hil
Positron Interactions With Molecules
No full textIn this work, we report elastic integral cross sections for low energy positron scattering by carbon monoxide and model calculations for vibrationally enhanced positron annhilation on molecules. The former studies employed the Schwinger Multichannel method in the static plus polarization approximation with two different basis sets to access numerical convergence. In the annihilation studies, the role of multimode vibrational couplings was surveyed with the help of an analytically solvable model based on the Feshbach projection operator formalism.388PART 1Surko, C.M., Gribakin, G.F., Buckman, S.J., (2005) J. Phys. B: At. Mol. Phys., 38, p. 567. , 0953-4075Schultz, P.J., Lynn, K.G., (1998) Rev. Mod. Phys., 60 (3), p. 701. , 10.1103/RevModPhys.60.701 0034-6861Wahl, R.L., Buchanan, J.W., (2002) Principles and Practice of Positron Emission Tomography, , (Philadelphia, PA, Lippincott Williams and Wilkins)Amoretti, M., (2002) Nature, 419 (6906), p. 456. , 10.1038/nature01096 0028-0836Gabrielse, G., (2008) Phys. Rev. Lett., 100 (11), p. 113001. , 10.1103/PhysRevLett.100.113001 0031-9007Andresen, G.B., (2010) Nature, 468 (7324), p. 673. , 10.1038/nature09610 0028-0836Cassidy, D.B., Mills, A.P., (2007) Nature, 449 (7159), p. 195. , 10.1038/nature06094 0028-0836Surko, C.M., (2007) Nature, 449 (7159), p. 153. , 10.1038/449153a 0028-0836Hamada, A., Sueoka, O., (1994) J. Phys. B: At. Mol. Opt. Phys., 27 (20), p. 5055. , 10.1088/0953-4075/27/20/019 0953-4075Sullivan, J.P., (2011) J. Phys. B: At. Mol. Phys., 44 (3), p. 035201. , 0953-4075 035201Przybyla, D.A., Addo-Asah, W., Kauppila, W.E., Kwan, C.K., Stein, T.S., (1999) Phys. Rev., 60 (1), p. 359. , 10.1103/PhysRevA.60.359 1050-2947 ASanchez, S.D., Arretche, F., Lima, M.A.P., (2008) Phys. Rev., 77 (5), p. 054703. , 10.1103/PhysRevA.77.054703 1050-2947 AZecca, A., Chiari, L., Sarkar, A., Lima, M.A.P., Bettega, M.H.F., Nixon, K.L., Brunger, M.J., (2008) Phys. Rev., 78 (4), p. 042707. , 10.1103/PhysRevA.78.042707 1050-2947 ASanchez, S.A., Lima, M.A.P., (2008) Nucl. Instrum. Meth. Phys. Res., 266 (3), p. 447. , 10.1016/j.nimb.2007.12.022 0168-583X BArretche, F., Mazon, K., Michelin, S., Fujimoto, M., Iga, I., Lee, M.-T., (2008) Nucl. Instrum. Meth., 266 (3), p. 441. , 10.1016/j.nimb.2007.12.021 0168-583X BGribakin, G.F., Young, J.A., Surko, C.M., (2010) Rev. Mod. Phys., 82 (3), p. 2557. , 10.1103/RevModPhys.82.2557 0034-6861Nishimura, T., Gianturco, F.A., (2005) Phys. Rev., 72 (2), p. 022706. , 10.1103/PhysRevA.72.022706 1050-2947 ASanchez, S.A., Lima, M.A.P., Varella, M.T.D.N., (2009) Phys. Rev., 80 (5), p. 052710. , 10.1103/PhysRevA.80.052710 1050-2947 AGribakin, G.F., Lee, C.M.R., (2006) Phys. Rev. Lett., 97 (19), p. 193201. , 10.1103/PhysRevLett.97.193201 0031-9007Varella, M.T.D.N., Lima, M.A.P., (2007) Phys. Rev., 76 (5), p. 052701. , 10.1103/PhysRevA.76.052701 1050-2947 AVarella, M.T.D.N., (2008) Nucl. Instrum. Meth., 266 (3), p. 435. , 10.1016/j.nimb.2007.12.020 0168-583X BSanchez, S.A., Lima, M.A.P., Varella, M.T.D.N., (2011) Phys. Rev. Lett., 107 (10), p. 103201. , 10.1103/PhysRevLett.107.103201 0031-9007O'Malley, T.F., (1966) Phys. Rev., 150 (1), p. 14. , 10.1103/PhysRev.150.14 0031-899XDubé, L., Herzenberg, A., (1979) Phys. Rev., 20 (1), p. 194. , 10.1103/PhysRevA.20.194 0556-2791 AHazi, A.U., (1981) Phys. Rev., 23 (3), p. 1089. , 10.1103/PhysRevA.23.1089 0556-2791 ADomcke, W., (1991) Phys. Rep., 208 (2), p. 97. , 10.1016/0370-1573(91)90125-6 0370-1573Germano, J.S.E., Lima, M.A.P., (1993) Phys Rev., 47 (5), p. 3976. , 10.1103/PhysRevA.47.3976 1050-2947 ASzabo, A., Ostlund, N.S., (1989) Modern Quantum Chemistry: Introduction to Advanced Electronic Structure Theory, , (Dover Publication Inc., New York)Colemann, P.G., Griffith, T.C., Heyland, G.R., (1974) Appl. Phys., 4 (1), p. 89. , 10.1007/BF00884160 0340-3793Gianturco, F.A., Mukherjee, T., Paioletti, P., (1997) Phys. Rev., 56 (5), p. 3638. , 10.1103/PhysRevA.56.3638 1050-2947 AKwan Ch, K., (1983) Phys. Rev., 27 (3), p. 1328. , 10.1103/PhysRevA.27.1328 0556-2791 ASueoka, O., Hamada, A., (1993) J. Phys. Soc. Japan., 62 (8), p. 2669. , 10.1143/JPSJ.62.2669 0031-9015Young, J.A., (2008) Phys. Rev., 77, pp. 060702R. , AYoung, J.A., Surko, C.M., (2008) Phys. Rev., 78 (3), p. 032702. , 10.1103/PhysRevA.78.032702 1050-2947
Excitation Of The A1Πg And B3Π G Electronic States Of The Nitrogen Molecule By Electron Impact
No full textAb initio calculations were performed for the excitations of the a 1Πg and B3Πg and B 3Πg electronic states of the N2 molecule by impact of low-energy electrons. The scattering amplitudes were obtained by means of the Schwinger multichannel method within the scope of the minimal orbital basis for the single configuration interactions (MOB-SCI) approach. Through the use of the MOB-SCI strategy, we have investigated the coupling effects among ground state, first singlet, and first triplet excited states of the Πg symmetry. Integral and differential cross sections are shown for impact energies from near threshold up to 30 eV. Present results are compared with SMC two-state calculations and also with available theoretical and experimental data. © 2006 Wiley Periodicals, Inc.1061326642676Garscadden, A., (1992) Z Phys D, 24, p. 97Christophorou, L.G., Olthoff, J.K., (2002) Appl Surf Sci, 192, p. 309Christophorou, L.G., Olthoff, J.K., (2004) Fundamental Interactions with Plasma Processing Gases, , Kluwer Academic/Plenum: New YorkBecker, K.H., Elementary processes in plasmas (2001) Low Temperature Plasma Physics, , Hippler, R.Pfau, S.Schmidt, M.Schoenbach, K. H., Eds.Wiley-VHC: BerlinHuo, W.M., Kim, Y.K., (1999) IEEE Trans Plasma Sci, 27, p. 1225Brunger, M.J., Buckman, S.J., (2002) Phys Rep, 357, p. 215Takatsuka, K., McKoy, V., (1981) Phys Rev A, 24, p. 2473Takatsuka, K., McKoy, V., (1984) Phys Rev A, 30, p. 1734Da Costa, R.F., Da Paixão, F.J., Lima, M.A.P., (2004) J Phys B At Mol Opt Phys, 37, pp. L129Da Costa, R.F., Da Paixão, F.J., Lima, M.A.P., (2005) J Phys B At Mol Opt Phys, 38, p. 4363Lima, M.A.P., McKoy, V., (1988) Phys Rev A, 38, p. 501Lima, M.A.P., Brescansin, L.M., Da Silva, A.J.R., Winstead, C., McKoy, V., (1990) Phys Rev A, 41, p. 327Lippmann, B.A., Schwinger, J., (1950) Phys Rev, 79, p. 469Lane, N.F., (1980) Rev Mod Phys, 52, p. 29Moncrieff, D., Kobus, J., Wilson, S., (1995) J Phys B At Mol Opt Phys, 28, p. 4555Goddard III, W.A., Hunt, W.J., (1974) Chem Phys Lett, 24, p. 464Chaudhuri, F., Varella, M.T.N., Carvalho, C.R.C., Lima, M.A.P., (2004) Nucl Instrum Methods Phys Res, 221, p. 69Chaudhuri, P., Varella, M.T.N., Carvalho, C.R.C., Lima, M.A.P., (2004) Phys Rev A, 69, p. 042703Gillan, C.J., Tennyson, J., McLaughlin, B.M., Burke, P.G., (1996) J Phys B At Mol Opt Phys, 29, p. 1531Campbell, L., Brunger, M.J., Nolan, A.M., Kelly, L.J., Wedding, A.B., Harrison, J., Teubner, P.J.O., McLaughlin, B., (2001) J Phys B At Mol Opt Phys, 34, p. 1185Trajmar, S., Register, D.F., Chutjian, A., (1983) J Phys Rep, 5, p. 97Mason, N.J., Newell, W.R., (1987) J Phys B At Mol Opt Phys, 20, p. 3913Shemansky, D.E., Ajello, J.M., Hall, D.T., (1985) Astrophys J, 296, p. 765Finn, T.G., Doering, J.P., (1976) J Chem Phys, 64, p. 4490Khakoo, M.A., Johnson, P.V., Ozkay, I., Yan, P., Trajmar, S., Kanik, I., (2005) Phys Rev A, 71, p. 062703Brunger, M.J., Teubner, P.J.O., (1990) Phys Rev A, 41, p. 141
- …
