Knowledge Bank

A weak signal near 13395 cm $\mathrm{<mrow\; data-mjx-texclass="ORD">-1</mrow>}$ in the low resolution laser induced fluorescence spectra of the laser ablated Y/ethylene supersonic expension products was noted by $Simarda$. He speculated that it may be due to ytcrium dicarbide. Following up on his suggestion, we have detected by medium resolution LIF three red degraded hands at 12895 cm $\mathrm{<mrow\; data-mjx-texclass="ORD">-1</mrow>}$, 13395 cm $\mathrm{<mrow\; data-mjx-texclass="ORD">-1</mrow>}$ and 13896 cm $\mathrm{<mrow\; data-mjx-texclass="ORD">-1</mrow>}$ which we attribute to YCC. The resolved LIF spectra for the $12895cm-1$ and $13395cm-1$ band systems produce strong Strokes progressions with the features separated by approximately $560cm-1$. 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 $\mathrm{<mrow\; data-mjx-texclass="ORD">-1</mrow>}$ band system was recorded. Attempts to model the spectrum as a $A~4A1-X~2A1$ transition suggested by a recent ab initio $calculationb$ are being made. Progress on the analysis will be presented.