Free-jet infrared absorption spectroscopy of stable and unstable molecular species
- 1 January 1988
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in Faraday Discussions of the Chemical Society
- Vol. 86, 1-12
- https://doi.org/10.1039/dc9888600001
Abstract
High-resolution vibration–rotation spectra of stable and unstable molecular species have been studied at low rotational and vibrational temperatures. Infrared absorption in a pulsed supersonic free jet has been measured by a frequency-tunable diode laser in a single- or multi-pass configuration. The modulated infrared absorption is detected by a lock-in amplifier or a two-channel boxcar integrator. The ν3 band of SiCl4 at 624 cm–1 is studied as one of the series of work on heavy non-polar inorganic compounds. Five spectroscopic constants are determined accurately for the ν3 band of 28Si35Cl4. Weakly bound molecular complexes are studied in the middle infrared region as unstable molecular species. Well resolved ro-vibrational spectra are observed in (N2O)2, C2H2·Ar, (C2H2)2, (C2H2)3, BF3·X (X = Ne, Ar, Kr), C6H6·X (X = Ar, Kr), and (NO)2 with Doppler-limited resolution. Infrared–microwave double resonance in a free jet is discussed for microwave spectroscopy of van der Waals complexes in vibrationally excited states.Keywords
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