Multiphoton ionization photoelectron spectroscopy of iodine-bearing molecules
Zietkiewicz, Christopher John
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https://hdl.handle.net/2142/18953
Description
Title
Multiphoton ionization photoelectron spectroscopy of iodine-bearing molecules
Author(s)
Zietkiewicz, Christopher John
Issue Date
1992
Doctoral Committee Chair(s)
Eden, James G.
Department of Study
Electrical and Computer Engineering
Discipline
Electrical Engineering
Degree Granting Institution
University of Illinois at Urbana-Champaign
Degree Name
Ph.D.
Degree Level
Dissertation
Keyword(s)
Physics, Molecular
Language
eng
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.
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