Photodissociation Processes Involving the SiH + Molecular Ion: New Datasets for Modeling

V. A. Srećković, H. Delibašić-Marković (), L. M. Ignjatović, V. Petrović and V. Vujčić
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V. A. Srećković: Institute of Physics Belgrade, University of Belgrade, Pregrevica 118, 11080 Belgrade, Serbia
H. Delibašić-Marković: Faculty of Science, Department of Physics, University of Kragujevac, Radoja Domanovića 12, 34000 Kragujevac, Serbia
L. M. Ignjatović: Institute of Physics Belgrade, University of Belgrade, Pregrevica 118, 11080 Belgrade, Serbia
V. Petrović: Faculty of Science, Department of Physics, University of Kragujevac, Radoja Domanovića 12, 34000 Kragujevac, Serbia
V. Vujčić: Institute of Physics Belgrade, University of Belgrade, Pregrevica 118, 11080 Belgrade, Serbia

Data, 2025, vol. 10, issue 11, 1-13

Abstract: This paper investigates the photodissociation of the S i H + molecular ion, a non-symmetric diatomic species composed of silicon and hydrogen. We provide calculated molecular data and characterize electronic states, deriving cross-sections and spectral absorption rate coefficients as functions of temperature (1000–10,000 K) and EUV and UV wavelength. The calculations are performed within a quantum–mechanical framework of bound–free radiative transitions, using ab initio electronic potentials and dipole transition functions as inputs. In addition, we present a straightforward fitting formula that enables practical interpolation of photodissociation cross-sections and spectral rate coefficients, providing a novel closed-form representation of the dataset for modeling purposes. The resulting dataset provides a consistent and accessible reference for advanced photochemical modeling in laboratory plasmas and astrophysical environments.

Keywords: atomic and molecular datasets; laboratory and astrophysical plasma; optical characteristics; absorption; photodissociation; SiH + molecular ion; spectral rate coefficients (search for similar items in EconPapers)
JEL-codes: C8 C80 C81 C82 C83 (search for similar items in EconPapers)
Date: 2025
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