Abstract
Abstract A supersonic molecular jet apparatus has been constructed for use with a Fourier transform infrared spectrometer (Bruker IFS 120 HR) or with the millimeter-wave and diode laser spectrometers available in the Giessen laboratory. Design criteria were chosen to provide optimum conditions for obtaining spectral simplification for relatively large molecules with large amplitude motions. Use with unstable species is planned. Thus, throughput could not be too high, and temperature need not be extremely low. First results with the jet system attached to the interferometer are presented. Test measurements with CO2 show a rotational temperature of 22 K for a hole nozzle, and are used to contrast the spectra from a hole and a slit nozzle. A trial jet spectrum of OCCCO shows significant cooling of the low-lying ν7 bending mode and considerable simplification, revealing some new features not detected in an earlier room-temperature study.
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