Rovibrational analysis of the v15 band in the HCN---HF hydrogen bonded cluster

High-resolution infrared spectroscopy of weakly bound molecular complexes

“…Cooled White cell techniques have been extended into regions of the spectrum less convenient for tunable IR lasers by use of interferometric, Fourier transform methods. [72][73][74][75][76][77][78][79][80][81][82] The limiting resolution of an FTIR instrument scales as the length traveled by the interferometric mirrors and consequently cannot begin to challenge the >102-m coherence lengths routinely achievable by frequency-stabilized CW lasers. However, for Doppler-limited, pressureor predissociationbroadened spectra lines, this limitation of FTIR methods may not be important.…”

The Vibrational Spectroscopy and Dynamics of Weakly Bound Neutral Complexes

“…Several factors limit the general application of this method, namely: (i) the limited resolution resulting from the use of the spectrometer; (ii) the low equilibrium concentration of the species of interest; (iii) the high temperature of the gas (relative to that obtained from free jet expansions), which makes the spectrum more congested; and (iv) obscuration of the spectrum of interest by the often overwhelming intensity of the monomer absorptions. With the advent of high-resolution Fourier transfonn infrared (FIIR) spectrometers (24,25) and widely tunable infrared laser sources (26,27), the resolution of these gas cell experiments has been greatly improved, thus alleviating at least some of the problems. The resolution obtained in these experitnents is typically limited by a combination of Doppler and pressure broadening (26).…”

The isomers of HF–HCN formed in helium nanodroplets: Infrared spectroscopy and ab initio calculations

“…4 -6 Due to the complex tunneling motions associated with this system, the wave functions sample significant regions of the potential surface. 7,8 The linear HCN-HF complex has also been studied extensively in the gas phase, using a wide variety of methods, including microwave, 9 far-infrared 10 and mid-infrared and near-infrared [11][12][13][14][15][16][17][18][19][20][21][22][23] spectroscopies. All of the fundamental vibrational frequencies have been experimentally determined and many vibrational hot and combination bands have also been observed, including those for many of the isotopomers.…”