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FAR INFRARED FOURIER TRANSFORM SPECTROSCOPY IN EMISSION
Olivier Pirali, M. Vervloët
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Abstract
We are currently developing sources allowing gas phase molecular emission to be recorded by FTS in the Far Infrared region. Our preliminary results were presented last $year^{a}$. Improvements of the efficiency of our sources result in the observation of lower frequency molecular emission. We illustrate this with two examples. By recording the thermal vibration-rotation emission spectra of few PAH's using a new technique, the emission spectrum of anthracene was extended (for the first time to our knowledge) to its lowest frequency component located at around $87 cm^{-1}$. By using a radiofrequency discharge through a flowing mixture of $C_{2}H_{4}$ and $N_{2}$, rotational emission of HCN was detected in the spectral range $30 - 180 cm^{-1}$. Rotational lines in pure bending motion were assigned up to the vibrational level (050). Results on HCN will be compared to those obtained by submillimeter-wave $spectroscopy^{b}$ and infrared $spectroscopy^{c}$.