Spectroscopy of HCN in the 6000 cm−1 Region

Vibrational Energy Transfer

“…Quantum state resolved experiments on highly vibrationally excited molecules have followed two important trails, blazed by the two laser-based methods: overtone and stimulated emission pumping , (SEP). The thriving field of overtone spectroscopy and dynamics, ,− which is built entirely upon harmonically forbidden transitions, is testament to the amazing times in which we live. High spectral brightness lasers in the infrared and visible force one to consider carefully the meaning of the phrase “forbidden transition”.…”

“…There are, however, a number of molecules that are clearly tractable. One of these is HCN, and there has been some work done using overtone pumping. − Eventually one must come to grips with the fact that larger molecules have complex spectra that cannot be easily assigned. It remains a fascinating challenge for the future to see what can be learned about the collisional properties of such molecules.…”

Collision-Assisted Spectroscopy of HCN above the Isomerization Barrier

“…The lower wavelength range merely probed known states such as (2,4 0 ,0) which were previously characterized but in studies at lower energy content. 18,19,21 Separation of the frequency doubled output from the visible fundamental was accomplished with a set of four S1UV Pellin Brocca prisms or above 510 nm with a NiSO 4 /CoSO 4 liquid filter solution.…”

“…Further details of the experimental apparatus and procedure may be found in the literature. 18,19,21…”

“…Portions of its ground-state potential surface have been well characterized by numerous theoretical [1][2][3][4][5][6][7][8][9][10] and experimental investigations. [11][12][13][14][15][16][17][18][19] Of considerable interest is the accurate description of the global potential surface for HCN/HNC isomerization. Toward this end, more spectroscopic data in the region near the isomerization barrier is important.…”