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Article Dans Une Revue Journal of Chemical Physics Année : 2017

Extracting spectroscopic molecular parameters from short pulse photo-electron angular distributions

Résumé

Using a quantum wave packet simulation including the nuclear and electronic degrees of freedom, we investigate the femtosecond and picosecond energy- and angle-resolved photoelectron spectra of the E(Σg+1) electronic state of Li2. We find that the angular distributions of the emitted photoelectrons depend strongly on the pulse duration in the regime of ultrashort laser pulses. This effect is illustrated by the extraction of a time-dependent asymmetry parameter whose variation with pulse duration can be explained by an incoherent average over different ion rotational quantum numbers. We then derive for the variation of the asymmetry parameter a simple analytical formula, which can be used to extract the asymptotic CW asymmetry parameters of individual transitions from measurements performed with ultra-short pulses.
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Dates et versions

hal-04380121 , version 1 (02-02-2024)

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R. Chamakhi, R. Puthumpally-Joseph, M. Telmini, Eric Charron. Extracting spectroscopic molecular parameters from short pulse photo-electron angular distributions. Journal of Chemical Physics, 2017, 147 (14), pp.144304. ⟨10.1063/1.4998818⟩. ⟨hal-04380121⟩
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