A variety of ab initio methods have been used to calculate the and state spectroscopic parameters of the free radicals. The theoretical methods and basis sets were tested on GeCH, for which extensive experimental data are available, and found to give predictions sufficiently reliable to guide experimental searches for spectra. In all cases, the linear species was found to be the global minimum on the potential energy surface, with the bent isomer as a local minimum much higher in energy. In both the ground and excited states, the GeC moiety is very similar to that of GeCH, with a double bond in the lower state and a triple bond in the excited state, indicating that halogenation does not radically perturb the energetics or structure of germanium methylidyne. Ground state radicals have suitable rotational constants for microwave studies, although they suffer from only modest dipole moments. Matrix infrared experiments are most likely to detect the fundamentals in the region or the fundamentals at the transition between the mid- and far-infrared regions. We have used the ab initio values for the Renner-Teller parameter, the average bending frequency, and the spin-orbit coupling constant to calculate the ground state energy levels, which will be helpful in the interpretation of single vibronic level emission spectra, if they can be observed. The electronic absorption spectra of the spin component of the bands of all three radicals have been calculated assuming typical jet-expansion conditions and should be useful in future laser-induced fluorescence, resonance enhanced multiphoton ionization, or cavity ringdown searches for the electronic band systems.
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14 April 2006
Research Article|
April 13 2006
In search of the germanium halomethylidyne (; ) free radicals: Ab initio studies of their spectroscopic signatures
Brandon S. Tackett;
Brandon S. Tackett
Department of Chemistry,
University of Kentucky
, Lexington, Kentucky 40506-0055
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Dennis J. Clouthier
Dennis J. Clouthier
a)
Department of Chemistry,
University of Kentucky
, Lexington, Kentucky 40506-0055
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a)
Author to whom correspondence should be addressed. Electronic mail: dclaser@uky.edu
J. Chem. Phys. 124, 144308 (2006)
Article history
Received:
January 13 2006
Accepted:
February 22 2006
Citation
Brandon S. Tackett, Dennis J. Clouthier; In search of the germanium halomethylidyne (; ) free radicals: Ab initio studies of their spectroscopic signatures. J. Chem. Phys. 14 April 2006; 124 (14): 144308. https://doi.org/10.1063/1.2187474
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