TF07 15min3:12
A MOLECULAR BEAM OPTICAL STUDY OF YCC.

J. XIN, A. J. MARR AND T. C. STEIMLE, Department of Chemistry and Biochemistry, Arizona State University, Tempe, AZ, 85287 -1604.

A weak signal near 13395 cm-1 in the low resolution laser induced fluorescence spectra of the laser ablated Y/ethylene supersonic expansion products was noted by Simard. He speculated that it may be due to yttrium dicarbide. Following up on his suggestion, we have detected by medium resolution LIF three red degraded bands at 12895 cm-1, 13395 cm-1 and 13896 cm-1 which we attribute to YCC. The resolved LIF spectra for the 12895 cm-1 and 13395 cm-1 band systems produce strong Stokes progressions with the features separated by approximately 560 cm-1. These are tentatively assigned to the Y-CC ground state stretching. Additional weaker features are also observed. The high resolution LIF spectrum of the 12895 cm-1 band system was recorded. Attempts to model the spectrum as a A4 A1-X2 A1 transition suggested by a recent ab initio calculation are being made. Progress on the analysis will be presented.