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Arnar Hafliðason

University of Iceland, Iceland

Title: Multiphoto-fragmentation of molecules: REMPI and VMI of HBr

Biography

Biography: Arnar Hafliðason

Abstract

Analysis of mass resolved spectra as well as velocity map images derived from resonance enhanced multiphoton ionization (REMPI) of HBr via resonance excitations to mixed Rydberg and valence (ion-pair) states allows characterization of the effect of a triplet-to-singlet1,5 and singlet-singlet2,3,4,5 state interaction on further photoexcitation and photo-ionization processes. The analysis makes use of rotational spectra line shifts, line intensity alterations, kinetic energy release spectra as well as angular distributions. Energy-level-dependent state mixing of the resonance excited states is quantified and photoexcitation processes, leading to H+ formation are characterized in terms of the states and fragmentation processes involved, depending on the state mixing

Figure 1. Schematic representation of the main channels involving excitation, fragmentation and ionization of the HBr molecule. “KERs arrows” indicate kinetic energy release of fragment species. Other arrows show excitation and ionization processes involved.