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Two-color studies of CH3Br excitation dynamics with MPI and slice imaging

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Abstract

Two-color pump–probe experiments were performed to explore the multiphoton dynamics of CH3Br at high excitation energies of 8–10 eV, involving two-photon resonant excitations to a number of np and nd Rydberg states (pump) followed by REMPI detection (probe) of the Br, Br* and CH3(X) photoproducts. Slice images of Br+ and CH3+ ions were recorded in pump-only, probe-only and pump and probe experiments. Kinetic-energy release spectra (KERs), as well as spatial anisotropy parameters, were extracted from the images to identify the processes and the dynamics involved. Predissociation channels, following the two-photon resonant excitations and non-resonant photodissociation forming CH3(X) and Br/Br*, were identified and characterized. Furthermore, the probe excitations for CH3(X) involved near-resonant excitations to lower energy 5s Rydberg states of CH3Br. In three-photon excitation processes, a striking contrast is seen between excitations via the p/d and the s Rydberg states. Involvement of high-energy interactions between Rydberg and ion-pair states is identified.

Graphical abstract: Two-color studies of CH3Br excitation dynamics with MPI and slice imaging

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Publication details

The article was received on 12 Oct 2018, accepted on 18 Apr 2019 and first published on 23 Apr 2019


Article type: Paper
DOI: 10.1039/C8CP06376A
Phys. Chem. Chem. Phys., 2019, Advance Article

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    Two-color studies of CH3Br excitation dynamics with MPI and slice imaging

    A. Hafliðason, P. Glodic, G. Koumarianou, P. C. Samartzis and Á. Kvaran, Phys. Chem. Chem. Phys., 2019, Advance Article , DOI: 10.1039/C8CP06376A

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