1,721,107 research outputs found
The infrared spectrum of 12C2HD: the stretching-bending combination bands in the 1800-4700 cm-1 region
No full textThe experimental equilibrium structure of acetylene
Full text linkThe empirical equil. structure of acetylene has been derived by exploiting the very precise exptl. rotational consts. available in the literature for the 10 isotopologues relative to all the possible combinations of H, D, 12C and 13C atoms. The geometry obtained when data for all species are fitted together is: re(CH) = 106.167(14) pm and re(CC) = 120.2866(72) pm. This detn. shows some systematic residuals due to the singly D-substituted isotopologues. If we exclude such species from the fit, we obtain our most precise evaluation: re(CH) = 106.1689(23) pm and re(CC) = 120.2817(12) pm. The possibility of a breakdown of the Born-Oppenheimer approxn. has also been tested
First laboratory measurement of the J=1-0 transitions of (ArH+)-Ar-36 and (Arh+)-Ar-38: new, improved rest frequences for astronomical searchers
No full textThe recent detections of 36ArH+ and 38ArH+ in the interstellar medium have triggered interest in argonium. This
molecular cation has proved to be widespread in our galaxy in the diffuse medium and may serve as a very specific
tracer of atomic gas and as a proxy for the cosmic-ray ionization rate. Pure rotational transitions of the two
isotopologues detected in the ISM have never been recorded in the laboratory until this work. Here, we report on
the first detection of the J = 1 - 0 transition of both 36ArH+ and 38ArH+ produced in a low-pressure glow
discharge. All of the rotational and ro-vibrational transition frequencies available have been analyzed in global
multi-isotopologues fit to give a comprehensive set of isotopic independent spectroscopic parameters. These data
allow us to compute an improved set of rotational and ro-vibrational rest frequencies to assist astronomical
searches of ArH+
HIGH-RESOLUTION FT-IR SPECTROSCOPY OF DIFLUOROMETHANE IN THE 7.4-11 MICROMETRE ATMOSPHERIC WINDOW
No full textThe spectroscopic analysis of the v2 = 1, v5 = 1, and v3 = v6 = 1 infrared vibration system of H3SiI
No full textThe ν2 (A1)/ν5 (E)/ν3 + ν6 (E) band system of H283SiI was investigated using Fourier transform IR spectra recorded from 820 to 1100 cm- 1 at a resoln. of 2.0 × 10- 3 cm- 1. In total, 11,903 transitions were assigned. Addnl. 1466 transitions reaching the v3 = v6 = 1 state were obtained from the ν3 + ν6 - ν6 and ν3 + ν6 - ν3 hot bands near 360 and 590 cm- 1, resp. Moreover, 30 highly accurate CO2 laser sideband transitions of the rQ0 branch of ν5 (J.M. Frye, W. Schupita, and G. Magerl, J. Mol. Spectrosc. 128, 427 (1988)) were implemented in the data set with J max ' spm = 140 and K max ' spm = 21. To adequately reproduce the complex pattern of interacting levels the Hamiltonian employed included 14 off-diagonal terms. These comprise x,y Coriolis ro-vibration resonances, between ν2/ν5, ν2/ν3 + ν6 and ν5/ν3 + ν6, and the anharmonic Fermi resonance between ν5/ν3 + ν6. All these resonances strongly perturb the v2 = 1, v5 = 1, and v3 = v6 = 1 excited states whose rounded deperturbed vibrational term values are 904.5, 941.1, and 953.7 cm- 1, resp. In addn., the Δl = Δk = ± 2 l-resonance was found to be active within the v3 = v6 = 1 state and between v5 = 1 and v3 = v6 = 1; the Δl = ± 2 , Δk = ∓ 1 l-resonance within the v5 = 1 state and between v5 = 1 and v3 = v6 = 1 was established, as well as the Δl = ± 1 , Δk = ∓ 2 α resonance between v2 = 1 and v5 = 1. A std. deviation of the fit, 0.48 × 10- 3 cm- 1, resulted which is ca. three times the estd. precision of exptl. wavenumbers. Improved J-dependent ground state parameters of H3SiI were obtained by fitting 5420 combination differences, σ(fit) = 0.22 × 10- 3 cm- 1
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe 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
Variations on the Author
Full text link“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
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