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Vibrational effects in the photo-ion yield spectrum of the SiH 2 + molecular ion following 2p inner-shell excitation

Kennedy, E T ; Mosnier, J P ; Van Kampen, P ; Bizau, J M ; Cubaynes, D ; Guilbaud, S ; Carniato, S ; Puglisi, A ; Sisourat, N

Journal of physics. Conference series, 2019, Vol.1289 (1), p.12003 [Periódico revisado por pares]

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Título:
Vibrational effects in the photo-ion yield spectrum of the SiH 2 + molecular ion following 2p inner-shell excitation
Autor: Kennedy, E T ; Mosnier, J P ; Van Kampen, P ; Bizau, J M ; Cubaynes, D ; Guilbaud, S ; Carniato, S ; Puglisi, A ; Sisourat, N
É parte de: Journal of physics. Conference series, 2019, Vol.1289 (1), p.12003
Descrição: Abstract We report on complementary theoretical and laboratory investigations of the 2p ion yield cross sections for the molecular-ion series SiH n + (n = 1, 2, 3), in the 95-108 eV photon energy range, below the L-shell threshold. The experiments used an electron cyclotron resonance (ECR) plasma molecular-ion source coupled with monochromatised synchrotron radiation in a merged-beam configuration. The experimental spectra are compared with total photoabsorption cross-sectional profiles calculated using an ab initio configuration interaction method inclusive of spin-orbit coupling and the vibrational dynamics. The experimental results show vibrationally resolved resonances for SiH 2 + in the 98-102 eV range. The calculations indicate twenty four core-excited states below the energy of 102 eV, of which only four contribute significantly to the observed spectrum. These states correspond to the excitation of an atomic-like 2p electron to the SiH 2 + (5a 1 ) valence orbital.
Idioma: Inglês

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