117,454 research outputs found
LOW-TEMPERATURE COLLISIONAL BROADENING IN THE FAR-INFRARED CENTRIFUGAL DISTORTION SPECTRUM OF CH4
No full textPreviously, we could record on the AILES Beamline at the SOLEIL Synchrotron facility the first resolved centrifugal distorsion spectrum of methane (CH) in the THz region, which led to a precise determination of line intensities footnote{V. Boudon, O. Pirali, P. Roy, J.-B. Brubach, L. Manceron and J. Vander Auwera, {em J. Quant. Spectrosc. Radiate. Transfer}, {bf 111}, 1117--1129 (2010).}. Later, we could measure collisional self- and N-broadening coefficients at room temperaturefootnote{M. Sanzharov, J. Vander Auwera, O. Pirali, P. Roy, J.-B. Brubach, L. Manceron, T. Gabard and V. Boudon, {em J. Quant. Spectrosc. Radiate. Transfer}, {bf 113}, 1874--1886 (2012).}. This time, we reinvestigated this topic by measuring these broadening coefficients at low temperature (between 120~K and 160~K) for to , thanks to a cryogenic multipass cellfootnote{F. Kwabia Tchana, F. Willaert, X. Landshere, J.-M. Flaud, L. Lago, M. Chapuis, C. Herbeaux, P. Roy and L. Manceron, {em Rev. Sci. Instrum./}, {bf 84}, 093101 (2013).}. We used a 93~m total optical path length. Five pure methane pressures (from 10 to 100 mbar) and four CH/N mixtures (20~% of methane with a total pressure from 100 to 800 mbar) were used. These measurements allow us to obtain data for physical conditions approaching those of Titan's atmosphere and to estimate temperature exponents.Made available in DSpace on 2016-01-05T20:04:21Z (GMT). No. of bitstreams: 3
847.pdf: 22959 bytes, checksum: 61663efdae341a66017ea7b040f50426 (MD5)
310849.pptx: 7849321 bytes, checksum: 82aadd7ccb5a06965080ae8bcfc6aa16 (MD5)
license.txt: 4813 bytes, checksum: 715c4321821a960fa1a1e91d2ac7ebce (MD5)
Previous issue date: 2
NEW DATA AND ANALYSIS FOR SF6 ABSORPTION MODELLING IN THE 10 MICRON ATMOSPHERIC WINDOW
No full textModelling correctly the SF atmospheric absorption requires the knowledge of the spectroscopic parameters of all states involved in the many hot bands in the 10 m atmospheric window used for remote sensing. Since a direct analysis of the hot bands near the \nub{3} absorption of SF in this atmospheric window is not possible, due to their overlapping, we use another strategy, gathering information in the far and mid infrared regions on initial and final states to compute the relevant total absorption.
In this talk, we present new results of an analysis of spectra recorded at the AILES beam line at the SOLEIL Synchrotron facility. For these measurements, we used an IFS125HR interferometer in the 100 to 3200 \wn range, coupled to a cryogenic multiple pass cell. The optical path length was varied from 45 to 141 m with 223 and 153 K temperatures. New information has been obtained on the \nub{3} + \nub{5} band which, combined with improved parameters for \nub{5}, is used to model the important \nub{3}+\nub{5} - \nub{5} hot band contribution [1]. Also, data have been obtained on the \nub{3} band of the SF isotopic species present in very low abundance (0.0002) [2]. These new parameters will be included in the XTDS model [3] and VAMDC/SheCaSDa database [4], thus improving the previous SF parameters.
[1] M. Faye, L. Manceron, P. Roy, V. Boudon, M. Loete, “First analysis of the \nub{3}+\nub{5} combination band of SF observed at Doppler-limited resolution and effective model for the \nub{3}+\nub{5}-\nub{5} hot band” J. Mol. Spectrosc., in press.
[2] M. Faye, L. Manceron, P. Roy, V. Boudon, M. Loete, “First high resolution analysis of the \nub{3} band of the SF isotopologue”, J. Mol. Spectrosc., in press.
[3] C. Wenger, V. Boudon, M. Rotger, M. Sanzharov, and J.-P. Champion,”XTDS and SPVIEW: Graphical tools for Analysis and Simlation of High Resolution Molecular Spectra”, J. Mol. Spectrosc. 251, 102 (2008).
[4] http://vamdc.icb.cnrs.fr/PHP/shecasda.ph
New data and analysis for SF6 absorption modelling in the 10 micron atmospheric window
No full textMade available in DSpace on 2018-08-17T16:08:59Z (GMT). No. of bitstreams: 2
3064.pdf: 21168 bytes, checksum: 83b104f43500925c4e27f126a89eda8f (MD5)
license.txt: 4802 bytes, checksum: 58353f9dd6876860dd5221f3d7872a95 (MD5)
Previous issue date: 6Made available in DSpace on 2018-12-12T22:38:06Z (GMT). No. of bitstreams: 4
3064.pdf.txt: 2355 bytes, checksum: 0ecbe3f175c43040f14d18bcbff88b15 (MD5)
license.txt: 4802 bytes, checksum: 58353f9dd6876860dd5221f3d7872a95 (MD5)
3064.pdf: 21168 bytes, checksum: 83b104f43500925c4e27f126a89eda8f (MD5)
1124488.pptx: 4454435 bytes, checksum: fd6bdb8df33ef9e8cd505d36b8bc0eac (MD5)
Previous issue date: 6Modelling correctly the SF6 atmospheric absorption requires the knowledge of the spectroscopic parameters of all states involved in the many hot bands in the 10 µm atmospheric window used for remote sensing. Since a direct analysis of the hot bands near the ν3 absorption of SF6 in this atmospheric window is not possible, due to their overlapping, we use another strategy, gathering information in the far and mid infrared regions on initial and final states to compute the relevant total absorption. In this talk, we present new results of an analysis of spectra recorded at the AILES beam line at the SOLEIL Synchrotron facility. For these measurements, we used an IFS125HR interferometer in the 100 to 3200 cm−1 range, coupled to a cryogenic multiple pass cell. The optical path length was varied from 45 to 141 m with 223 and 153 K temperatures. New information has been obtained on the ν3 + ν5 band which, combined with improved parameters for ν5, is used to model the important ν3+ν5 - ν5 hot band contribution [1]. Also, data have been obtained on the ν3 band of the 36SF6 isotopic species present in very low abundance (0.0002) [2]. These new parameters will be included in the XTDS model [3] and VAMDC/SheCaSDa database [4], thus improving the previous SF6 parameters.
[1] M. Faye, L. Manceron, P. Roy, V. Boudon, M. Loete, “First analysis of the ν3+ν5 combination band of SF6 observed at Doppler-limited resolution and effective model for the ν3+ν5-ν5 hot band” J. Mol. Spectrosc., in press.
[2] M. Faye, L. Manceron, P. Roy, V. Boudon, M. Loete, “First high resolution analysis of the ν3 band of the 36SF6 isotopologue”, J. Mol. Spectrosc., in press.
[3] C. Wenger, V. Boudon, M. Rotger, M. Sanzharov, and J.-P. Champion,”XTDS and SPVIEW: Graphical tools for Analysis and Simlation of High Resolution Molecular Spectra”, J. Mol. Spectrosc. 251, 102 (2008).
[4] http://vamdc.icb.cnrs.fr/PHP/shecasda.ph
HIGH RESOLUTION IR SPECTROSCOPY AND ANALYSIS OF THE BENDING DYAD OF RuO4
No full textRuO is a heavy tetrahedral molecule of interest in several fields. Due to its chemical toxicity and radiological impact of its 103 and 106 isotopologues, the possible remote sensing of this compound in the atmosphere in case of possible severe nuclear accident has renewed interest in its spectroscopic properties. We investigate here, for the first time at high resolution, the bending modes region in the far infrared. High resolution FTIR spectra have been recorded near room temperature, using a specially constructed cell and an isotopically pure sample of RuO. New assignments and effective Hamiltonian parameter fits for the main isotopologue (RuO) have been performed, treating the whole \nub{2}-\nub{4} bending mode dyad. We provide precise effective Hamiltonian parameters, including band centers and Coriolis interaction parameters [1].
[1] S. Reymond-Laruinaz, M. Faye, V. Boudon, D. Doizi, L. Manceron, “High-resolution Infrared Spectroscopy and analysis of the \nub{2}-\nub{4} bending dyad of Ruthenium Tetroxide”, J. Mol. Spectrosc. 336 (2017) 29
High resolution IR spectroscopy and analysis of the bending dyad of RuO4
No full textMade available in DSpace on 2018-08-17T16:08:55Z (GMT). No. of bitstreams: 2
3035.pdf: 18448 bytes, checksum: 203a99e6849905fd801710a23f67f5e9 (MD5)
license.txt: 4802 bytes, checksum: 58353f9dd6876860dd5221f3d7872a95 (MD5)
Previous issue date: 6Made available in DSpace on 2018-12-12T22:37:17Z (GMT). No. of bitstreams: 4
3035.pdf.txt: 1577 bytes, checksum: 18550e6aac6c0d54386b62e0cf1e5493 (MD5)
license.txt: 4802 bytes, checksum: 58353f9dd6876860dd5221f3d7872a95 (MD5)
3035.pdf: 18448 bytes, checksum: 203a99e6849905fd801710a23f67f5e9 (MD5)
1113845.pptx: 2682059 bytes, checksum: 4156df895df951c07f68f7261814bf1d (MD5)
Previous issue date: 6RuO4 is a heavy tetrahedral molecule of interest in several fields. Due to its chemical toxicity and radiological impact of its 103 and 106 isotopologues, the possible remote sensing of this compound in the atmosphere in case of possible severe nuclear accident has renewed interest in its spectroscopic properties. We investigate here, for the first time at high resolution, the bending modes region in the far infrared. High resolution FTIR spectra have been recorded near room temperature, using a specially constructed cell and an isotopically pure sample of 102RuO4. New assignments and effective Hamiltonian parameter fits for the main isotopologue (102RuO4) have been performed, treating the whole ν2-ν4 bending mode dyad. We provide precise effective Hamiltonian parameters, including band centers and Coriolis interaction parameters [1].
[1] S. Reymond-Laruinaz, M. Faye, V. Boudon, D. Doizi, L. Manceron, “High-resolution Infrared Spectroscopy and analysis of the ν2-ν4 bending dyad of Ruthenium Tetroxide”, J. Mol. Spectrosc. 336 (2017) 29
LINE INTENSITY MEASUREMENTS AND ANALYSIS IN THE ν3 BAND OF RUTHENIUM TETROXIDE
No full textRuthenium tetroxide (RuO) is a heavy tetrahedral molecule characterized by an unusual volatility near ambient temperature. Because of its chemical toxicity and the radiological impact of its Ru and Ru isotopologues, the possible remote sensing of this compound in the atmosphere has renewed interest in its spectroscopic properties. In a recent study, the strong fundamental band associated with the excitation of the infrared active stretching mode of RuO, observed near 10 m, was re-investigated at high-resolution (0.001 cm) with the help of a Ru isotopically pure sample.\footnote{S. Reymond-Laruinaz, V. Boudon, L. Manceron, L. Lago, D. Doizi, J Mol Spectrosc 315 (2015) 46--54.} Building upon that work, the present contribution is the first investigation dealing with high-resolution line-by-line intensity measurements for the fundamental band of RuO. It relies on high resolution Fourier transform infrared spectra specifically recorded at room temperature at the AILES beam line of SOLEIL using synchrotron radiation, a specially constructed cell and an isotopically pure sample of RuO. Relying on an effective Hamiltonian and associated effective dipole moment, the measured line intensities were assigned and dipole moment parameters determined. A HITRAN-formatted frequency and intensity line list was generated
Going Beyond Counting First Authors in Author Co-citation Analysis
No full textThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Square Dancing with the Stars to Enhance Dynamic Hirschman Linkages?
No full textIn this Presidential Address, the author takes the reader on a reconnaissance of his life and time as a regional scientist. He points out scenery he found scintillating along the way, hoping that some may pick up the banner and chew on a few of the ideas for a while. He suggests a revisit to Albert O. Hirschman’s notion of key sectors and more empirical analysis related to Marcus Berliant’s and Masahisa Fujita’s notion of knowledge creation and transfer.Presidential Address, San Antonio, Texas, March 29, 2014 (53rd Meetings of the Southern Regional Science Association
Appropriate Similarity Measures for Author Cocitation Analysis
No full textWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
Letter from unknown writer to Jesse L. Boyce
No full textLetter to Jesse L. Boyce from unknown author (possibly Jack) about the investigation into the powder magazine located in the Grand Canyon. Some personal news is included in the letter such as the writer's marriage to the daughter of C.A. Taylor, former Supervisor of Cochise County
- …
