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Astron. Astrophys. 338, 243-261 (1998)

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A MonteCarlo model of the rotation of a big, isolated molecule in the ISM

G. Mulas 1, 2, 3

1 European Southern Observatory, Karl Schwarzschild Strasse 2, D-85748 Garching, Germany
2 Osservatorio Astronomico di Cagliari, Str. 54, Loc. Poggio dei Pini, I-09012 Capoterra (CA), Italy
3 Dipartimento di Scienze Fisiche dell'Università di Cagliari, Via Ospedale 72, I-09124 Cagliari, Italy

Received 10 March 1998 / Accepted 12 May 1998


In the diffuse interstellar medium a molecule experiences isolation conditions that cannot (yet?) be achieved in the laboratory. In such conditions its rotation is dominated by the interaction with the radiation field through a complex statistical equilibrium. This problem has been analyzed numerically with MonteCarlo techniques, for a simplified PAH molecule model. As a possible application, the result has been used to calculate rotational profiles of absorption bands, suitable for direct comparison with observed molecular bands profiles.

Key words: line: profiles – ISM: general – molecules – infrared: ISM: lines and bands

Send offprint requests to: G. Mulas
Correspondence to: gmulas@eso.org, gmulas@ca.astro.it

© European Southern Observatory (ESO) 1998

Online publication: September 8, 1998