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Fourier-transform-spectroscopic photoabsorption cross sections and oscillator strengths for the S2B3Σu−−X3Σg− system
Ist Teil von
The Journal of chemical physics, 2018-06, Vol.148 (24), p.244302-244302
Erscheinungsjahr
2018
Link zum Volltext
Quelle
American Institute of Physics (AIP) Journals
Beschreibungen/Notizen
Photoabsorption cross sections and oscillator strengths for the strong, predissociating vibrational bands,
v
≥
11
, in the
S
2
B
3
Σ
u
−
−
X
3
Σ
g
−
(
v
,
0
)
system are reported. Absorption measurements were undertaken on S
2
vapor produced by a radio-frequency discharge through H
2
S seeded in helium, and also in a two-temperature sulfur furnace, at temperatures of 370 K and 823 K, respectively. S
2
column densities were determined in each source by combining experimental line strengths in low-
v
non-predissociating
B
−
X
bands (
v
< 7) with calculated line
f
-values based on measured radiative lifetimes and calculated branching ratios. The broad-band capabilities of two vacuum-ultraviolet Fourier-transform spectrometers, used with instrumental resolutions of 0.22 cm
−1
and 0.12 cm
−1
, respectively, allowed for simultaneous recordings of both non-predissociating and predissociating bands, thus placing the predissociating-band cross sections on a common absolute scale. Uncertainties in the final cross section datasets are estimated to be 15% for the 370-K vapor and 10% for the 823-K vapor. The experimental cross sections are used to inform a detailed predissociation model of the
B
(
v
) levels in Paper II [Lewis
et al.
, J. Chem. Phys.
148
, 244303 (2018)]. For astrophysical and other applications, this model can be adjusted simply to provide isotopologue-specific cross sections for a range of relevant temperatures.