A possible mechanism for sulfur mass independent fractionation in the B-X system of S2

Hull, Alexander W.

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https://hdl.handle.net/2142/100721 Copy

Description

Title

A possible mechanism for sulfur mass independent fractionation in the B-X system of S2

Author(s)

Hull, Alexander W.

Contributor(s)

• Field, Robert W.
• Ono, Shuhei

Issue Date

2018-06-22

Keyword(s)

Atmospheric science

Abstract

Here, I continue my discussion of Sulfur Mass Independent Fractionation (S-MIF) in the S2 B-X UV band system, relevant to the geologic signature of the anoxic atmosphere that existed prior to the Great Oxygen Event 2.4 billion years ago. To test a possible mechanism for the isotope effect, I implement a steady state, master equation kinetic model for every bound rovibronic state in the B/B” system. This model incorporates both rotationally inelastic and electronically inelastic collisions. The output of the model suggests that such collisions have negligible impact on average excited state lifetimes, indicating that the isotope effect is primarily spectroscopic in nature. The steady state populations that are output from the deperturbation/master equation model are useful in identifying which bright/dark state crossings are most proficient at populating long lifetime states, and thereby generating an S-MIF signature. A major conclusion from this analysis is that only a small minority of level crossings have such a capability, and, consequently, these have a dominant influence on the isotope effect averaged over the total system.

Publisher

International Symposium on Molecular Spectroscopy

Type of Resource

text

Language

eng

Permalink

http://hdl.handle.net/2142/100721

DOI

10.15278/isms.2018.FF04

Copyright and License Information

Copyright 2018 Alexander W. Hull

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