Abstract
Two-photon dissociation of carbon monoxide near 193 nm with a tunable ArF* laser to yield excited C(2 1D) atoms is reported. The atoms are detected by subsequent absorption of a third laser photon to C(3 1P°) followed by emission of 248 nm fluorescence to C(2 1S). The process is found to be isotopically sensitive; the C(2 1D) yield from 13C 16O and 12C 18O is a factor of 6 greater than from 12C 16O. The isotope effect is attributable to an enhancement in the two-photon matrix element due to the shift in the near resonant a 2Π, v=2 intermediate state. C2 Swan band emission is also observed, arising from association of the free carbon atoms, and exhibits a corresponding isotope effect. Finally, collisional processes are observed involving excited carbon atoms and electrons, using two-photon ionization of a small quantity of added xenon atoms as a new technique for producing a controlled density of free electrons.
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