Potential Energy Curves and Ultraviolet Absorption Cross Sections of Sulfur Dimer

Sarka, Karolis; Nanbu, Shinkoh

doi:10.1021/acsearthspacechem.3c00116

Cited by 2 publications

(1 citation statement)

References 47 publications

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“…While molecular sulfur has been studied extensively by experiments − and theory − over the last decades, its photoexcitation dynamics are still unclear due to its complexity and to spin–orbit coupling between its manifold of states. Our laboratory studies of S 2 use a discharge system in which diatomic sulfur is produced in the discharge and then allowed to interact with intense laser light.…”

Section: Introductionmentioning

confidence: 99%

Multiphoton Ionization/Dissociation of Molecular Sulfur S₂ in the UV Region

Sun,

Farooq,

Chen

et al. 2024

J. Phys. Chem. A

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The multiphoton ionization/dissociation dynamics of molecular sulfur (S2) in the ultraviolet range of 205–300 nm is studied using velocity map ion imaging (VMI). In this one-color experiment, molecular sulfur (S2) is generated in a pulsed discharge and then photodissociated by UV radiation. At the three-photon level, superexcited states are accessed via two different resonant states: the B 3Σu – (v′ = 8–11) valence states at the one-photon level and a Rydberg state at the two-photon level. Among the decay processes of these superexcited states, dissociation to electronically excited S atoms is dominant as compared to autoionization to ionic states S2 + (X 2Πg) at wavelengths λ < 288 nm. The anisotropy parameter extracted from these images reflects the parallel character of these electronic transitions. In contrast, autoionization is found to be particularly efficient at S(1D) and S(1S) detection wavelengths around 288 nm. Information obtained from the kinetic energy distributions of S atoms has revealed the existence of vibrationally excited S2 + (X 2Πg (v + > 11)) that dissociates to ionic products following one-photon absorption. This work also reveals many interesting features of S2 photodynamics compared to those of electronically analogous O2.

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Section: Introductionmentioning

confidence: 99%

Multiphoton Ionization/Dissociation of Molecular Sulfur S₂ in the UV Region

Sun,

Farooq,

Chen

et al. 2024

J. Phys. Chem. A

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A HITRAN-formatted UV line list of S2-containing transitions involving X3 Σg-, B3 Σu-, and B″ 3 Πu electronic states

Gomez,

Hargreaves,

Gordon

2024

Monthly Notices of the Royal Astronomical Society

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The sulfur dimer (S2) is an important molecular constituent in cometary atmospheres and volcanic plumes on Jupiter’s moon Io. It is also expected to play an important role in the photochemistry of exoplanets. The UV spectrum of S2 contains transitions between vibronic levels above and below the dissociation limit, giving rise to a distinctive spectral signature. By using spectroscopic information from the literature, and the spectral simulation program PGOPHER, a UV line list of S2 is provided. This line list includes the primary $B\, ^{3}\Sigma ^{-}_{u}-X\, ^{3}\Sigma ^{-}_{g}$ (v′=0-27, v″=0-10) electronic transition, where vibrational bands with v′≥10 are predissociated. Intensities have been calculated from existing experimental and theoretical oscillator strengths, and semi-empirical strengths for the predissociated bands of (S2) have been derived from comparisons with experimental cross-sections. The S2 line list also includes the $B^{\prime \prime }\, ^{3}\Pi _{u}-X\, ^{3}\Sigma ^{-}_{g}$ (v′=0-19, v″=0-10) vibronic bands due to the strong interaction with the B state. In summary, we present the new HITRAN-formatted S2 line list and its validation against existing laboratory spectra. The extensive line list covers the spectral range 21 700−41 300 cm−1 (∼242 −461 nm) and can be used for modeling both absorption and emission.

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Potential Energy Curves and Ultraviolet Absorption Cross Sections of Sulfur Dimer

Cited by 2 publications

References 47 publications

Multiphoton Ionization/Dissociation of Molecular Sulfur S₂ in the UV Region

Multiphoton Ionization/Dissociation of Molecular Sulfur S₂ in the UV Region

A HITRAN-formatted UV line list of S2-containing transitions involving X3 Σg-, B3 Σu-, and B″ 3 Πu electronic states

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Potential Energy Curves and Ultraviolet Absorption Cross Sections of Sulfur Dimer

Cited by 2 publications

References 47 publications

Multiphoton Ionization/Dissociation of Molecular Sulfur S2 in the UV Region

Multiphoton Ionization/Dissociation of Molecular Sulfur S2 in the UV Region

A HITRAN-formatted UV line list of S2-containing transitions involving X3 Σg-, B3 Σu-, and B″ 3 Πu electronic states

Contact Info

Product

Resources

About

Multiphoton Ionization/Dissociation of Molecular Sulfur S₂ in the UV Region

Multiphoton Ionization/Dissociation of Molecular Sulfur S₂ in the UV Region