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Issue 46, 2019
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The absolute photoionization cross section of the mercapto radical (SH) from threshold up to 15.0 eV

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Abstract

We present the absolute photoionization cross-section of the mercapto radical, SH, recorded from its first ionization energy at 10.4 eV up to a photon energy of 15 eV. The absolute scale was calibrated at the fixed photon energy of 11.2 eV using the known values of H2S and S as references. SH and S were produced in a microwave discharge flow-tube reactor by hydrogen abstraction of the H2S precursor. The measured photoionization cross-section of SH dramatically differs from the one currently employed to model the presence of this species in a number of astronomical environments, where SH along with its ionic counterpart SH+ have been detected. The cation spectroscopy and fragmentation of H2S, SH and S in the 9.2–15.0 eV energy range obtained using threshold photoelectron techniques is also presented and discussed in the context of existing literature.

Graphical abstract: The absolute photoionization cross section of the mercapto radical (SH) from threshold up to 15.0 eV

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Article information


Submitted
25 Oct 2019
Accepted
11 Nov 2019
First published
12 Nov 2019

Phys. Chem. Chem. Phys., 2019,21, 25907-25915
Article type
Paper

The absolute photoionization cross section of the mercapto radical (SH) from threshold up to 15.0 eV

H. R. Hrodmarsson, G. A. Garcia, L. Nahon, J. Loison and B. Gans, Phys. Chem. Chem. Phys., 2019, 21, 25907
DOI: 10.1039/C9CP05809E

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