The infrared spectrum of H₂S from 1 to 5 μm

Abstract

The absorption spectra of H2S from 2000 to 11 147 cm−1 have been obtained with spectral resolutions of 0.006, 0.012, and 0.021 cm−1 using the Fourier transform spectrometer at Kitt Peak National Observatory. The transitions of 21 bands have been assigned for the first time and 9 others reanalyzed so that accurate energy levels, band origins, and rotational parameters could be determined. The analysis of these data revealed some remarkable features in the energy spectrum, e.g., fourfold clustering of rotational levels belonging to the symmetric and asymmetric components of local mode manifolds at a high degree of stretching excitation. This paper reports fitted vibrational parameters and predicted band origins of H232S up to 12 735 cm−1. It also presents the degenerate rotational constants and upper state energies of (301)–(202) and (311)–(212) at 1 μm as illustrations of clustering in the local mode limit.

High Resolution Fourier Transform Spectrum of H2S in the 3300–4080 cm−1Region

“…They have been examined previously with low resoracy of the lines used is 1 1 10 03 cm 01 . As compared to lution (4) and they are also mentioned in the quite recent this value the other factors having systematic influence on paper (5), where the H 2 S spectrum over a wide wavenumthe line positions are of negligible importance. The internal ber range has been studied.…”

“…Values of rotational energy levels of the states (110), (011), and (030) derived from experimental data are shown in columns 2, 6, and 10 of Table 3 together with values of N (columns 3, 7, and 11) and D (columns 4, 8, and 12). 5 The upper state energies from Table 3 were fitted and the values of spectroscopic parameters of the states (110), (011), and (030) presented in Table 4 were obtained. Values in parentheses in Table 4 are 1s statistical confidence intervals.…”

Highly Excited Motion in Molecules: Saddle-Node Bifurcations and Their Fingerprints in Vibrational Spectra

“…To solve this ambiguity, we could have chosen, as for the distinction of normal and local states, to use square brackets [...] for assigning the isomerization/ dissociation states and parentheses (...) for assigning the states belonging to the normal progressions, which evolve in a regular manner from the low-energy regime. [66][67][68] We instead add either an "I" (for "isomerization") or a "D" (for "dissociation") as an index in order to specify that this state belongs to the new progression, which follows the reaction pathway.…”

A Radiative Equilibrium Model of 51 Peg b

“…However, the total intensity of the three bands amounts to 3.6 × 10 −20 cm molecule −1 at 296 K (LechugaFossat et al 1984) over a bandwidth of ∼500 cm −1 (Bykov et al 1994), thus yielding a mean absorption 7 × 10 −23 cm 2 molecule −1 . Although this value is similar to that provided by water vapor in this spectral region, H 2 S is about 50 times less abundant than water for a solar elemental abundance and can thus be neglected.…”