Infrared Spectroscopy of H₂S and SH in Rare-Gas Matrixes

Abstract

Infrared (IR) spectra of hydrogen sulfide (H2S), some of its complexes, and their photolysis products are studied in rare-gas matrixes (Ar, Kr and Xe) at 7.5 K. In all of these matrixes, H2S is found to undergo hindered rotation. The vibration−rotation structures of monomeric H2S are observed at 2651−2615, 2640−2600, and 2625−2580 cm-1 in Ar, Kr, and Xe matrixes, respectively. Furthermore, the H2S dimer and the H2S···H2O complex are observed in various matrixes. Upon UV-induced decomposition of H2S, IR absorptions of SH radical appear at 2607 cm-1 (Ar) and 2594 cm-1 (Kr). The SH radical is also observed to be complexed with H2S (2563, 2553, and 2550 cm-1 in Ar, Kr, and Xe, respectively) and water (2556 cm-1 in Kr).

Mechanism of Heterogeneous Reaction of Carbonyl Sulfide on Magnesium Oxide

“…The bands at 2578 cm -1 is the characteristic frequency of ν s (SH) of surface HS. 20,21 The peak at 3755 cm -1 for surface hydroxyl 22 decreased in intensity as a function of time. The bands at 1659 and 1409 cm -1 were assigned to ν as (OCO) and ν s (OCO) of surface HCO 3 -species, which were accompanied by ν(OH) and δ(OH) at 3618 and 1225 cm -1 , respectively.…”

Low-temperature thermoluminescence in solid argon: Short-range mobility of atoms

“…We used SO 2 ͑Ͼ99.9%, Fluka͒, Ar ͑Ͼ99.9999%, AGA͒, and H 2 S 2 synthesized by cracking sulfanes (H 2 S n ) as described elsewhere. 24 The gas mixture was deposited onto a CsI substrate in a closed cycle helium cryostat ͑DE-202A, APD͒, providing temperatures down to 7.5 K. The temperature was measured with a silicon diode ͑accuracy 0.5 K͒, and a resistive heater provided higher temperatures.…”

“…24,29 In the 193-nm photolysis, this absorption band disappears typically after some hundreds of pulses. S 2 molecules were found to be the major product among sulfur-containing species in 193-nm photolysis of H 2 S 2 .…”

Production of Sulfur Allotropes in Electron Irradiated Jupiter Trojans Ice Analogs

“…After two hours of irradiation, a band appears at 2507 cm −1 . One possible assignment of this band is the H 2 S 2 dimer or H 2 S 2 -H 2 S complex, based on previous assignments by Isoniemi et al (1999). The S-H stretching mode of H 2 S 2 is in the same position as the H 2 S band (in the mixture H 2 S-H 2 O) at 2550 cm −1 , precluding direct detection of H 2 S 2 .…”

“…H 2 S 2 formed early in the irradiation is likely dissociated by the irradiation and may react to form larger molecules. Isoniemi et al (1999) studied UV photolysis of H 2 S 2 ice in an Ar matrix and concluded that this photochemistry leads to the formation of the HS 2 radical and S 2 . Dissociation of H 2 S 2 presumably contributes to the production of S 2 detected by TPD.…”