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Formation of highly excited iodine atoms from multiphoton excitation of CH3I

Abstract

Mass resolved REMPI spectra, as well as CH3+and I+ ion photoelectron images, were recorded for two-photon resonant excitations of CH3I via s, p and d Rydberg states (CH3I**) in the excitation region of 55 700 to 70 000 cm-1. Photoelectron (PE) and ion kinetic energy release spectra (KERs) were derived from the images. The data revealed that after the two-photon resonant excitation, an additional photon is absorbed to form one or more superexcited state(s) (CH3I#), followed by branching into three pathways. The major one is the dissociation of CH3I# to form excited Rydberg states of iodine atoms (I**) along with CH3(X), a phenomenon not commonly observed in methyl halides. The second (minor) pathway involves autoionization of CH3I# towards CH3I+(X), which absorbs another photon to form CH3+ along with I/I* and the third one is dissociation CH3I# dissociation towards the ion pair, CH3+ + I-, prior to I- electron ejection. Furthermore, one-photon non-resonant dissociation of CH3I to form CH3(X) and I/I* prior to three-photon ionization of the fragments is also detected.

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Supplementary files

Article information


Submitted
18 Nov 2019
Accepted
07 Feb 2020
First published
11 Feb 2020

Phys. Chem. Chem. Phys., 2020, Accepted Manuscript
Article type
Paper

Formation of highly excited iodine atoms from multiphoton excitation of CH3I

K. Matthíasson, G. Koumarianou, M. Jiang, P. Glodic, P. C. Samartzis and A. Kvaran, Phys. Chem. Chem. Phys., 2020, Accepted Manuscript , DOI: 10.1039/C9CP06242D

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