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oai:www.ideals.illinois.edu:2142/19911 2023-07-10 col_2142_5131 col_2142_8859 com_2142_5130 com_2142_8858 com_2142_234

9780591254761 AAI9717339 (UMI)AAI9717339 http://hdl.handle.net/2142/19911 eng Copyright 1996 Tran, Hao Chi Tran, Hao Chi 2011-05-07T12:22:36Z 2011-05-07T12:22:36Z 10000-01-01 1997 The $\rm B\sp1\Sigma\sbsp{u}{+}$ state of $\rm Cd\sb2,$ correlated with $\rm Cd(\sp1S)+Cd(5p\ \sp1P\sb1),$ was studied by laser excitation spectroscopy from the lowest metastable state, $\rm a\sp3\Pi\sb{g}.$ The excitation spectrum of the $\rm B\sp1\Sigma\sbsp{u}{+}\gets a\sp3\Pi\sb{g}$ transition in the 555-725 nm spectral range is presented. Birge-Sponner analysis of the $\rm v\sp{\prime\prime}$ = 0,1 vibrational progressions yielded spectroscopic constants for both the $\rm a\sp3\Pi\sb{g}$ and $\rm B\sp1\Sigma\sbsp{u}{+}$ state potentials. Iterative trial and error simulation of the excitation spectrum established the difference between the internuclear separations $\rm (\Delta R\sb{e})$ of the two states. The ultraviolet emission spectra of the $\rm B\sp1\Sigma\sbsp{u}{+}\to X\sp1\Sigma\sbsp{g}{+}$ (bound$\to$free) transition are presented with comparison to the best calculated spectra to determine the $\rm\Delta R\sb{e}$ between the $\rm B\sp1\Sigma\sbsp{u}{+}$ and $\rm X\sp1\Sigma\sbsp{g}{+}$ states. $\rm GO\sbsp{u}{+}\to XO\sbsp{g}{+}$ bound-free emission spectra of $\rm Hg\sb2$ from several different vibrational levels were analyzed to determine the (1) $\rm\Delta R\sb{e}$ between the $\rm GO\sbsp{u}{+}$ and $\rm XO\sbsp{g}{+}$ states, and (2) the region of internuclear separative over which the mostly dissociative ground state is bound. Photoassociative excitation spectrum is shown for the 265-285 nm spectral region which corroborates the emission data concerning the ground state. Gain on the $\rm GO\sbsp{u}{+}\to XO\sbsp{g}{+}$ transition was observed at ${\sim}227$ nm when a prepared population of $\rm Hg\sb2$ in the metastable $\rm AO\sbsp{g}{+}$ state is pumped with 564.3 nm radiation. This represents an anti-Stokes shift of ${\sim}3.3$ eV of the pump radiation and confirms the reality of a population inversion between the $\rm AO\sbsp{g}{+}$ (storage) state and the dissociative $\rm XO\sbsp{g}{+}$ ground state. Made available in DSpace on 2011-05-07T12:22:36Z (GMT). No. of bitstreams: 2 license.txt: 4922 bytes, checksum: 910b249b4beec47e7ab768910c8f966f (MD5) 9717339.pdf: 2079604 bytes, checksum: bca41d15a1abaca90f5a9cfe8c518fa4 (MD5) Previous issue date: 1996 Item marked as restricted to the 'UIUC Users [automated]' Group (id=2) by Howard Ding (hding2@illinois.edu) on 2011-05-07T14:40:16Z Item is restricted indefinitely. Restriction data tranferred 2014-07-01T11:17:12-05:00 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 Physics, Molecular Group IIB dimers: Spectroscopy of molecular cadmium and gain demonstration in molecular mercury text Physics Physics University of Illinois at Urbana-Champaign Dissertation Ph.D.