Quantitative studies of the photoabsorption of carbonyl sulphide in the valence-shell, S 2p, 2s and C 1s inner-shell regions (4–360 eV) by dipole electron impact spectroscopies
Electronic excitation spectra and absolute photoabsorption oscillator strengths (cross-sections) have been measured in the UV, VUV and soft X-ray energy regions for the valence- and inner- (S 2p, 2s, C 1s) shell photoabsorption of carbonyl sulphide (OCS) from 5 to 360 eV using low-resolution (∼1 eV...
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Published in | Chemical physics Vol. 252; no. 3; pp. 359 - 378 |
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Main Authors | , , |
Format | Journal Article |
Language | English |
Published |
Elsevier B.V
01.02.2000
|
Online Access | Get full text |
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Summary: | Electronic excitation spectra and absolute photoabsorption oscillator strengths (cross-sections) have been measured in the UV, VUV and soft X-ray energy regions for the valence- and inner- (S 2p,
2s, C 1s) shell photoabsorption of carbonyl sulphide (OCS) from 5 to 360 eV using low-resolution (∼1 eV fwhm) dipole (e,
e) spectroscopy. The absolute oscillator strength scale has been determined using valence-shell TRK (i.e.,
S(0)) sum-rule normalization. The discrete structures, as well as the continuum structures, in the valence region also have been studied at high resolution (∼0.05 eV fwhm) from 4 to 32 eV. The presently reported high- and low-resolution absolute photoabsorption oscillator strengths are compared with previously published data (from the direct photoabsorption measurements) in those limited energy regions where such data exist. Evaluation of the
S(−2) sum using the presently reported absolute differential photoabsorption oscillator strength data gives a static dipole polarizability for carbonyl sulphide in excellent agreement (within 2%) with previously reported polarizability values. Other dipole sums
S(
u) (
u=−1,
−3
to
−6,
−8,
−10) and logarithmic dipole sums
L(
u) (
u=−1 to −6) are also determined from the presently reported absolute differential photoabsorption oscillator strength data. |
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ISSN: | 0301-0104 |
DOI: | 10.1016/S0301-0104(99)00363-8 |