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Astron. Astrophys. 329, 375-379 (1998)

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New near infrared emission bands of CO: a highly sensitive spectroscopic property of CO to probe the interstellar matter

Murthy S. Gudipati and Martin Kalb

Institut für Physikalische Chemie, Universität zu Köln, Luxemburger Straße 116, D-50939 Köln, Germany (murthy@hartree.pc.uni-koeln.de)

Received 29 April 1997 / Accepted 27 August 1997


Several new near infrared (NIR) emission bands between 7000 and 16000 cm-1 of CO isolated in Ar matrices at 20 K have been observed that are due to radiative deactivation of the e [FORMULA], d [FORMULA] and a [FORMULA] states to the a [FORMULA] state. The corresponding excitation spectra are due to the fourth positive system of CO, namely, the A [FORMULA] X [FORMULA] transition. The environment around CO, i.e., whether it is in the gas-phase or imbedded in a condensed environment, influences strongly which radiative channels get active or not and their transition energies. It is proposed that this behaviour can be taken to advantage to probe the environment of the interstellar matter.

Key words: molecular data – molecular processes – infrared: general; ISM: lines and bands – methods: laboratory

Send offprint requests to: M.S. Gudipati

© European Southern Observatory (ESO) 1998

Online publication: November 24, 1997