Color center laser spectroscopy of ν2 HCN---HF.

A continuously tunable single frequency color center laser spectrometer has been applied to analyze the rovibrational gas phase spectra of the fundamental ν2 (C–H stretching vibration) and its hot bands ν2+ν4-ν4 and ν2+ν17-ν17 in the linear dimer HCN---HF. The l-type doubling constants q″v and qv of the Π←Π band are both determined to be 12.4(8) MHz and anharmonic cross terms X024 and X027 are evaluated as -0.1656(17) and +0.1310(35), respectively from the available data. Excited state amplitude lifetimes in the ν2 band are demonstrated to be 1.3(4)×10-8 s. [ABSTRACT FROM AUTHOR]