A 1B1 Ryberg state of the H2S molecule

Gallo, Alejandro; Innes, K. K.

doi:10.1016/0022-2852(75)90173-3

Cited by 20 publications

(11 citation statements)

References 10 publications

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“…4). Elemental sulfur produced at 139.1-nm wavelength also shows a mass-independent composition in both 33 S and 36 S and is similar to measurements at 121.6 nm (Fig. 4).…”

Section: Resultssupporting

confidence: 62%

“…The sulfur isotopic composition (δ 33 S, δ 34 S, and δ 36 S) of product elemental sulfur is enriched with respect to initial H 2 S (except for two samples at 90-and 139.1-nm photolysis products, respectively) and shown in a combined three-isotope plot ( Fig. 3 and Table S1).…”

Section: Resultsmentioning

confidence: 99%

“…The range of heavy isotope fractionation (δ 34 S) in different types of achondrites is small compared to ordinary and enstatite chondrites (17). Mass-independent sulfur isotopic compositions (enrichment in 33 S) have been reported in achondritic meteorites, such as Ureilites, Oldhamite (CaS) in the Norton county, Aubrite, and Acapulcoite-Lodranites (17,18) (Fig. 2B).…”

Section: Sulfur In Achondritic Meteoritesmentioning

confidence: 99%

“…2B). In another enigmatic achondrite group, Ureilites, a range of 33 S anomalies has been observed that extends from 0.02‰ to 0.1‰ (Fig. 2B) (18,19).…”

Section: Sulfur In Achondritic Meteoritesmentioning

confidence: 99%

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Sulfur isotopic fractionation in vacuum UV photodissociation of hydrogen sulfide and its potential relevance to meteorite analysis

Chakraborty

Jackson

Ahmed

et al. 2013

Proc. Natl. Acad. Sci. U.S.A.

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Select meteoritic classes possess mass-independent sulfur isotopic compositions in sulfide and organic phases. Photochemistry in the solar nebula has been attributed as a source of these anomalies. Hydrogen sulfide (H 2 S) is the most abundant gas-phase species in the solar nebula, and hence, photodissociation of H 2 S by solar vacuum UV (VUV) photons (especially by Lyman-α radiation) is a relevant process. Because of experimental difficulties associated with accessing VUV radiation, there is a paucity of data and a lack of theoretical basis to test the hypothesis of a photochemical origin of mass-independent sulfur. Here, we present multiisotopic measurements of elemental sulfur produced during the VUV photolysis of H 2 S. Mass-independent sulfur isotopic compositions are observed. The observed isotopic fractionation patterns are wavelengthdependent. VUV photodissociation of H 2 S takes place through several predissociative channels, and the measured mass-independent fractionation is most likely a manifestation of these processes. Meteorite sulfur data are discussed in light of the present experiments, and suggestions are made to guide future experiments and models.chondrites | achondrites | isotope

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“…4). Elemental sulfur produced at 139.1-nm wavelength also shows a mass-independent composition in both 33 S and 36 S and is similar to measurements at 121.6 nm (Fig. 4).…”

Section: Resultssupporting

confidence: 62%

Section: Resultsmentioning

confidence: 99%

Section: Sulfur In Achondritic Meteoritesmentioning

confidence: 99%

“…2B). In another enigmatic achondrite group, Ureilites, a range of 33 S anomalies has been observed that extends from 0.02‰ to 0.1‰ (Fig. 2B) (18,19).…”

Section: Sulfur In Achondritic Meteoritesmentioning

confidence: 99%

See 2 more Smart Citations

Sulfur isotopic fractionation in vacuum UV photodissociation of hydrogen sulfide and its potential relevance to meteorite analysis

Chakraborty

Jackson

Ahmed

et al. 2013

Proc. Natl. Acad. Sci. U.S.A.

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show abstract

“…The VUV-absorption cross section of H 2 S is almost constant in the 120−143 nm (10.33−8.67 eV) range and decreases in the 143−173 nm (8.67−7.16 eV) range, with a maximum at 200 nm (6.19 eV) according to Feng et al (1999). The 1 B 1 ← 1 A 1 molecular transition was identified at 139.1 nm (8.91 eV) by Price & Simpson (1938) and confirmed by Gallo & Innes (1975).…”

Section: Solid Hydrogen Sulfidementioning

confidence: 79%

Vacuum-UV spectroscopy of interstellar ice analogs

Cruz-Díaz

Muñoz

Chen

et al. 2014

A&A

110

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Context. The vacuum-UV (VUV) absorption cross sections of most molecular solids present in interstellar ice mantles with the exception of H 2 O, NH 3 , and CO 2 have not been reported yet. Models of ice photoprocessing depend on the VUV absorption cross section of the ice to estimate the penetration depth and radiation dose, and in the past, gas phase cross section values were used as an approximation. Aims. We aim to estimate the VUV absorption cross section of molecular ice components. Methods. Pure ices composed of CO, H 2 O, CH 3 OH, NH 3 , or H 2 S were deposited at 8 K. The column density of the ice samples was measured in situ by infrared spectroscopy in transmittance. VUV spectra of the ice samples were collected in the 120−160 nm (10.33−7.74 eV) range using a commercial microwave-discharged hydrogen flow lamp. Results. We provide VUV absorption cross sections of the reported molecular ices. Our results agree with those previously reported for H 2 O and NH 3 ices. Vacuum-UV absorption cross section of CH 3 OH, CO, and H 2 S in solid phase are reported for the first time. H 2 S presents the highest absorption in the 120−160 nm range. Conclusions. Our method allows fast and readily available VUV spectroscopy of ices without the need to use a synchrotron beamline. We found that the ice absorption cross sections can be very different from the gas-phase values, and therefore, our data will significantly improve models that simulate the VUV photoprocessing and photodesorption of ice mantles. Photodesorption rates of pure ices, expressed in molecules per absorbed photon, can be derived from our data.

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Molecular Photodissociation Dynamics Revealed by Multiphoton Ionisation Spectroscopy

Ashfold

Bayley

Dixon

et al. 1985

Ber Bunsenges Phys Chem

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This article highlights the utility of multiphoton ionisation Spectroscopy to studies of the predissociation dynamics of Rydberg states in small polyatomic molecules. Predissociation from various of the excited states of H2O, H2S and their respective deuterated analogues is demonstrated to be a sensitive function of parent rotational level and to be critically affected by H ↔ D isotopic substitution and by accidental near resonances with more heavily predissociated “doorway” states which provide more efficient coupling into the background continuum of dissociative levels.

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A 1B1 Ryberg state of the H2S molecule

Cited by 20 publications

References 10 publications

Sulfur isotopic fractionation in vacuum UV photodissociation of hydrogen sulfide and its potential relevance to meteorite analysis

Sulfur isotopic fractionation in vacuum UV photodissociation of hydrogen sulfide and its potential relevance to meteorite analysis

Vacuum-UV spectroscopy of interstellar ice analogs

Molecular Photodissociation Dynamics Revealed by Multiphoton Ionisation Spectroscopy

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