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Eden, James G. Zietkiewicz, Christopher John 2011-05-07T11:52:28Z 2011-05-07T11:52:28Z 10000-01-01 1992 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. Made available in DSpace on 2011-05-07T11:52:28Z (GMT). No. of bitstreams: 2 license.txt: 4922 bytes, checksum: 910b249b4beec47e7ab768910c8f966f (MD5) 9215921.pdf: 2988324 bytes, checksum: 9a0e56782bf67227d5a56a5e647cff45 (MD5) Previous issue date: 1992 Item marked as restricted to the 'UIUC Users [automated]' Group (id=2) by Howard Ding (hding2@illinois.edu) on 2011-05-07T14:33:39Z Item is restricted indefinitely. Restriction data tranferred 2014-07-01T11:12:30-05:00 Original Data Group with Access UIUC Users [automated] Release Date: none Reason: ETDs are only available to UIUC Users without author permission ETDs are only available to UIUC Users without author permission U of I Only AAI9215921 (UMI)AAI9215921 http://hdl.handle.net/2142/18953 eng Copyright 1992 Zietkiewicz, Christopher John Physics, Molecular Multiphoton ionization photoelectron spectroscopy of iodine-bearing molecules text Electrical and Computer Engineering Electrical Engineering University of Illinois at Urbana-Champaign Dissertation Ph.D.