Abstract
Eleven far i.r. laser lines, generated by optical pumping with a CO 2 laser, have been assigned with the aid of available spectroscopic data and an accurate calculation of the vibration—rotation spectrum around 10 μm. The absorbing i.r. transitions coincident with the laser are in the ν 2 and ν 5 bands of 28SiH 3F which are strongly perturbed by Coriolis and l-type doubling effects. Predicted far i.r. transition wavenumbers are in close agreement with experiment and with predictions derived from a recent extensive FTIR and laser study in the 10 μm region.
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