2026-09-21T20:50:53Z https://www.ideals.illinois.edu/oai-pmh

oai:www.ideals.illinois.edu:2142/23651 2023-07-10 col_2142_5131 col_2142_8888 com_2142_5130 com_2142_8887 com_2142_234

http://hdl.handle.net/2142/23651 eng Copyright 1994 Chojnacki, Ann Margaret Physics, Molecular Eden, James G. Chojnacki, Ann Margaret 2011-05-07T14:22:00Z 2011-05-07T14:22:00Z 10000-01-01 1994 Multiphoton ionization of the hydrogen iodide molecule has been examined by photoelectron spectroscopy. The fixed wavelength experiments, at 355 nm and optical intensities of $\sim$10$\sp{12}$ W/cm$\sp2,$ reveal clear vibrational progressions associated with the $X\sp2\Pi$ spin-orbit split ion states following three- and four-photon ionization. Analysis of these spectra yields vibrational frequencies that differ from those from single photon experiments of Bowering et al. in ref. 27. These differences are explained by a differing set of photoelectron peak assignments for the high $\nu\sp+$ members of both series. Tunable laser experiments, at optical intensities of $\sim$10$\sp{11}$ W/cm$\sp2,$ have demonstrated (2 + 1)-REMPI ionization of the HI molecule through resonances in the intermediate $b\sp3\Pi\sb2$(v = 0,1;J = 0-12) state. However, resonances with Rydberg series in the ionization continua between the $X\sp2\Pi$ manifolds seen in single photon ionization experiments by Carlson et al. in ref. 20 were not seen here. The lack of any structure in this region in the present experiments is therefore attributed to resonances with predissociated states in the continua, which are favored over those states accessed in the single photon experiments. Made available in DSpace on 2011-05-07T14:22:00Z (GMT). No. of bitstreams: 2 license.txt: 4922 bytes, checksum: 910b249b4beec47e7ab768910c8f966f (MD5) 9512333.pdf: 2665271 bytes, checksum: 080b4061c52b58c45a6e26eb37700d98 (MD5) Previous issue date: 1994 Item marked as restricted to the 'UIUC Users [automated]' Group (id=2) by Howard Ding (hding2@illinois.edu) on 2011-05-07T15:05:55Z Item is restricted indefinitely. Restriction data tranferred 2014-07-01T11:31:37-05:00 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 AAI9512333 (UMI)AAI9512333 Multiphoton ionization and photoelectron spectroscopy of hydrogen iodide with fixed wavelength and tunable laser sources text Physics, Molecular Physics, Molecular University of Illinois at Urbana-Champaign Dissertation Ph.D.