EMISSION SPECTRA FOR MATRIX ISOLATED IF: OBSERVATION OF A NEW LOW LYING ELECTRONIC STATE
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Date
1986
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Ohio State University
Abstract
Laser induced fluorescence spectroscopy of IF isolated in an Argon matrix at 12K has been investigated. Following laser excitation at 355 nm, long-lived emission is observed in the near infra-red region. This emission, resolved with a monochromator, shows a vibrational progression at wavelengths of 721 nm up to 1333 nm. Spectral analysis indicates that the emission comesfrom the lowest vibrational level of a new low lying electronic state and terminates on the vibrational levels $v^{\prime\prime}=12$ up to $v^{\prime\prime}=25$ of the ground state $(X {^{1}}\Sigma^{+})$. This analysis provides an estimate for Te of about $20,800 cm^{-1}$ and an approximate equilibrium distance of 2.5 \AA. The lifetime for this emission was also measured and found to be 7 msec. Details of these experiments and a possible assignment for this new low lying electronic state will be presented.
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Work supported by AFOSR under grant 85--0210. Address of Nicola\""{i} and Heaven: Department of Chemistry, Illinois Institute of Technology, Chicago, Illinois 60616.
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