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oai:www.ideals.illinois.edu:2142/21418 2023-07-10 col_2142_5131 col_2142_8888 com_2142_5130 com_2142_8887 com_2142_234

Eden, James G. Schloss, James Harold 2011-05-07T13:08:05Z 2011-05-07T13:08:05Z 10000-01-01 1989 The photoassociation spectrum of Kr-F collision pairs in thermal equilibrium (293$\sp\circ$K) to KrF(B) has been observed using a laser-induced fluorescence technique with a tunable probe over the wavelength range 219 nm $\leq$ $\lambda$ $\leq$ 250 nm. The spectrum was then analyzed by numerical calculation of the Franck-Condon factors for the bound $\gets$ free transitions. The numerical calculation provided information on the KrF(X) and KrF(B) potential as well as the KrF(B $\to$ X) electronic dipole moment. Saturation intensities for photoassociation produced population were determined at 248 nm for gas mixtures with Kr partial pressures in the range 125 Torr $\leq$ p$\sb{\rm Kr}$ $\leq$ 1000 Torr and 1 Torr of F$\sb2$. Two-photon absorption of Kr/F$\sb2$ mixtures was also observed over the wavelength range 220 nm $\leq$ $\lambda$ $\leq$ 250 nm. The mechanism of the two-photon absorption is determined to be photodissociation of F$\sb2$ followed by photoassociation of non-thermalized Kr-F collision pairs. The spectral dependence of the yield of KrF(B) following photodissociation of Kr$\sb2$F(4$\sp2\Gamma$) was observed over the wavelength range 0.27 $\mu$m $\leq$ $\lambda$ $\leq$ 1.0 $\mu$m. Kr$\sb2$F(4$\sp2\Gamma$) was formed via two-photon excitation of a Kr/F$\sb2$ gas mixture with an ArF laser. A frequency doubled dye then excited Kr$\sb2$F(4$\sp2\Gamma$), and the intensity of the KrF(B $\to$ X) emission was monitored as a function of the excitation wavelength. This excitation spectrum was compared to the absorption spectrum of Kr$\sb2$F(4$\sp2\Gamma$) (as measured by suppression of the Kr$\sb2$F(4$\sp2\Gamma$ $\to$ 1$\sp2\Gamma$) emission) to determine the wavelength dependence of the quantum yield of KrF(B). Made available in DSpace on 2011-05-07T13:08:05Z (GMT). No. of bitstreams: 2 license.txt: 4922 bytes, checksum: 910b249b4beec47e7ab768910c8f966f (MD5) 9011006.pdf: 3563996 bytes, checksum: 343e31becfdf99e049107407fc358952 (MD5) Previous issue date: 1989 Item marked as restricted to the 'UIUC Users [automated]' Group (id=2) by Howard Ding (hding2@illinois.edu) on 2011-05-07T14:50:38Z Item is restricted indefinitely. Restriction data tranferred 2014-07-01T11:23:09-05:00 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 AAI9011006 (UMI)AAI9011006 http://hdl.handle.net/2142/21418 eng Copyright 1989 Schloss, James Harold Physics, Molecular Physics, Optics Photoassociation of krypton and fluorine collision pairs text Electrical and Computer Engineering Electrical Engineering University of Illinois at Urbana-Champaign Dissertation Ph.D.