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Photoionization spectroscopy of the SiH free radical in the vacuum-ultraviolet range

Abstract : The first measurement of the photoelectron spectrum of the silylidyne free radical, SiH, is reported between 7and 10.5 eV. Two main photoionizing transitions involving the neutral ground state, X + 1 Σ + ← X 2 Π, and a + 3 Π← X 2 Π, are assigned using ab initio calculations. The corresponding adiabatic ionization energies are derived,IE ad (X + 1 Σ + ) = 7.934(5) eV and IE ad (a + 3 Π) = 10.205(5) eV, in good agreement with our calculated values andthe previous determination by Berkowitz et al. [Berkowitz et al., J. Chem. Phys., 1987, 86, 1235] from a photoion-ization mass spectrometric study. The photoion yield of SiH recorded in this work exhibits a dense autoionizationlandscape similar to that observed in the case of the CH free radical [Gans et al. J. Chem. Phys., 2016, 144, 204307
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https://hal.archives-ouvertes.fr/hal-03711813
Contributor : Bérenger Gans Connect in order to contact the contributor
Submitted on : Friday, July 1, 2022 - 4:37:48 PM
Last modification on : Monday, July 4, 2022 - 3:39:02 AM

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Ning Lucie Chen, Bérenger Gans, Sebastian Hartweg, Gustavo A Garcia, Séverine Boyé-Péronne, et al.. Photoionization spectroscopy of the SiH free radical in the vacuum-ultraviolet range. Journal of Chemical Physics, American Institute of Physics, 2022, 157 (1), pp.014303. ⟨10.1063/5.0094863⟩. ⟨hal-03711813⟩

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