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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 Degree: Ph.D. Genre: Dissertation 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 Type: Text Language: English URI: http://hdl.handle.net/2142/18953 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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