# FAR INFRARED FOURIER TRANSFORM SPECTROSCOPY IN EMISSION

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 Title: FAR INFRARED FOURIER TRANSFORM SPECTROSCOPY IN EMISSION Creators: Pirali, O.; Vervloet, M. Issue Date: 2004 Publisher: Ohio State University 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 $spectroscopy^{c}$. Description: $^{a}$O. Pirali and M. Vervloet, $58^{th}$ International Symposium on Molecular Spectroscopy, paper WE06 (2003). $^{b}$Zelinger, T. Amano, V. Ahrens, S. Br\""{u}nken, F. Lewen, H.S.P. M\""{u}ller, and G. Winnewisser, J. Molec. Spectrosc., 220, 223 (2003). $^{c}$A. G. Maki, G. Ch. Mellau, S. Klee, M. Winnewisser, and W. Quapp, J. Molec. Spectrosc., 202, 67 (2000). Author Institution: Laboratoire de Photophysique Mol\'{e}culaire du CNRS, Universit\'{e} Paris-Sud URI: http://hdl.handle.net/1811/21363 Other Identifiers: 2004-TA-02