Issue 9, 2020

Formation of highly excited iodine atoms from multiphoton excitation of CH3I

Abstract

Mass resolved REMPI spectra, as well as CH3+and I+ ion and 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 (minor) is 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.

Graphical abstract: Formation of highly excited iodine atoms from multiphoton excitation of CH3I

Supplementary files

Article information

Article type
Paper
Submitted
18 Қар. 2019
Accepted
07 Ақп. 2020
First published
11 Ақп. 2020

Phys. Chem. Chem. Phys., 2020,22, 4984-4992

Formation of highly excited iodine atoms from multiphoton excitation of CH3I

K. Matthíasson, G. Koumarianou, M. Jiang, P. Glodic, P. C. Samartzis and Á. Kvaran, Phys. Chem. Chem. Phys., 2020, 22, 4984 DOI: 10.1039/C9CP06242D

To request permission to reproduce material from this article, please go to the Copyright Clearance Center request page.

If you are an author contributing to an RSC publication, you do not need to request permission provided correct acknowledgement is given.

If you are the author of this article, you do not need to request permission to reproduce figures and diagrams provided correct acknowledgement is given. If you want to reproduce the whole article in a third-party publication (excluding your thesis/dissertation for which permission is not required) please go to the Copyright Clearance Center request page.

Read more about how to correctly acknowledge RSC content.

Social activity

Spotlight

Advertisements