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Title:Multiphoton ionization photoelectron spectroscopy of iodine-bearing molecules
Author(s):Zietkiewicz, Christopher John
Doctoral Committee Chair(s):Eden, James G.
Department / Program:Electrical and Computer Engineering
Discipline:Electrical Engineering
Degree Granting Institution:University of Illinois at Urbana-Champaign
Subject(s):Physics, Molecular
Abstract:Multiphoton ionization of iodine-bearing molecules has been studied, under collision-free conditions, by observing the kinetic energy of the ejected photoelectrons. These experiments have demonstrated that, for photoionization of I$\sb2$, CF$\sb3$I and HI at 532 nm, the scission of the R-I bond (R=I, CF$\sb3$, HI) is favored over direct ionization of the molecule at intensities in the range of 10$\sp{12}$-10$\sp{13}$W/cm$\sp2$. For the parent molecules studied, we have observed that the atomic iodine photofragment is predominantly formed in the $\sp2$P$\sb{3/2}$ and $\sp2$P$\sb{1/2}$ spin-orbit terms of the atomic iodine ground state. Subsequent 5-photon ionization at 532 nm from the $\sp2$P$\sb{3/2}$ and $\sp2$P$\sb{1/2}$ ground states of the fragment preferably produces ions in the $\sp3$P$\sb2$ and $\sp3$P$\sb1$ levels of the ion ground state. These results are consistent with production of the atomic iodine fragment prior to ionization of the parent molecule. Above-threshold ionization is observed for atomic iodine excited from both the $\sp2$P$\sb{3/2}$ and $\sp2$P$\sb{1/2}$ ground states.
Only weak evidence was found for molecular ionization of I$\sb2$ at the extremes of intensities studied. For HI, however, the production of the v$\sp\prime$ = 0,1 levels of the $\sp2\Pi\sb{1/2}$ state of the ion and the v$\sp\prime$ = 0,1,2,3,4 levels of the $\sp2\Pi\sb{3/2}$ state of the molecule is reported.
Issue Date:1992
Rights Information:Copyright 1992 Zietkiewicz, Christopher John
Date Available in IDEALS:2011-05-07
Identifier in Online Catalog:AAI9215921
OCLC Identifier:(UMI)AAI9215921

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