Photoassociation of krypton and fluorine collision pairs
Schloss, James Harold
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https://hdl.handle.net/2142/21418
Description
Title
Photoassociation of krypton and fluorine collision pairs
Author(s)
Schloss, James Harold
Issue Date
1989
Doctoral Committee Chair(s)
Eden, James G.
Department of Study
Electrical and Computer Engineering
Discipline
Electrical Engineering
Degree Granting Institution
University of Illinois at Urbana-Champaign
Degree Name
Ph.D.
Degree Level
Dissertation
Keyword(s)
Physics, Molecular
Physics, Optics
Language
eng
Abstract
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).
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