Skip to content

Photodissociation of S2 (X3ςg -, a1Δg, and b1ςg +) in the 320-205 nm Region

Research output: Contribution to journalArticle

Original languageEnglish
Pages (from-to)6886-6896
Number of pages11
JournalJournal of Physical Chemistry A
Issue number32
Early online date19 Jul 2019
DateAccepted/In press - 3 Jul 2019
DateE-pub ahead of print - 19 Jul 2019
DatePublished (current) - 15 Aug 2019


Photodissociation of vibrationally and electronically excited sulfur dimer molecules (S2) has been studied in a combined experimental and computational quantum chemistry study in order to characterize bound-continuum transitions. Ab initio quantum chemistry calculations are carried out to predict the potential energy curves, spin-orbit coupling, transition moments, and bound-continuum spectra of S2 for comparison with the experimental data. The experiment uses velocity map imaging to measure S-atom production following S2 photoexcitation in the ultraviolet region (320-205 nm). A pulsed electric discharge in H2S produces ground-state S2 X3ςg -(v = 0-15) as well as electronically excited singlet sulfur and b1ςg +(v = 0, 1), and evidence is presented for the production and photodissociation of S2 a1Δg. In a previous paper, we reported threshold photodissociation of S2X3ςg -(v = 0) in the 282-266 nm region. In the present study, S(3PJ) fine structure branching and angular distributions for photodissociation of S2 (X3ςg -(v = 0), a1Δg and b1ςg +) via the B″3IIu, B3ςu - and 11IIu excited states are reported. In addition, photodissociation of the X3ςg -(v = 0) state of S2 to the second dissociation limit producing S(3P2) + S(1D) is characterized. The present results on S2 photodynamics are compared to those of the well-studied electronically isovalent O2 molecule.

Download statistics

No data available



  • Full-text PDF (final published version)

    Rights statement: This is the final published version of the article (version of record). It first appeared online via American Chemical Society at . Please refer to any applicable terms of use of the publisher.

    Final published version, 2.44 MB, PDF document

    Licence: CC BY-NC-ND


View research connections

Related faculties, schools or groups