Rotational Excitation of HC_3N by H_2 and He at low temperatures

Michael Wernli (1) , Laurent Wiesenfeld (1) , Alexandre Faure (1) , Pierre Valiron (1)

1 LAOG - Laboratoire d'Astrophysique de Grenoble

Rates for rotational excitation of HC3N by collisions with He atoms and H2 molecules are computed for kinetic temperatures in the range 5-20K and 5-100K, respectively. These rates are obtained from extensive quantum and quasi-classical calculations using new accurate potential energy surfaces (PES).

Mots clés: Inelastic collisional rates; Astrochemistry; Interstellar matter; cyanopolyynes; cyanoacetylene

Domaines: Chimie-Physique [physics.chem-ph]; Astrophysique [astro-ph]; Cosmologie et astrophysique extra-galactique [astro-ph.CO]

Michael Wernli, Laurent Wiesenfeld, Alexandre Faure, Pierre Valiron. Rotational Excitation of HC_3N by H_2 and He at low temperatures. 2006. ⟨hal-00116656⟩