Collisional excitation of HC3N by para- and ortho-H2

Abstract

New calculations for rotational excitation of cyanoacetylene by collisions with hydrogen molecules are performed to include the lowest 38 rotational levels of HC3N and kinetic temperatures to 300 K. Calculations are based on the interaction potential of Wernli et al. A&A, 464, 1147 (2007) whose accuracy is checked against spectroscopic measurements of the HC3N-H2 complex. The quantum coupled-channel approach is employed and complemented by quasi-classical trajectory calculations. Rate coefficients for ortho-H2 are provided for the first time. Hyperfine resolved rate coefficients are also deduced. Collisional propensity rules are discussed and comparisons between quantum and classical rate coefficients are presented. This collisional data should prove useful in interpreting HC3N observations in the cold and warm ISM, as well as in protoplanetary disks.

8 pages, 2 tables, 4 figures, accepted for publication in MNRAS

References in corpus (7)

• An atomic and molecular database for analysis of submillimetre line observations
• The cometary composition of a protoplanetary disk as revealed by complex cyanides
• Rotational Excitation of HC_3N by H_2 and He at low temperatures
• The IRAM-30m line survey of the Horsehead PDR: III. High abundance of complex (iso-)nitrile molecules in UV-illuminated gas
• CID: Chemistry In Disks VII. First detection of HC3N in protoplanetary disks
• Ro-vibrational relaxation of HCN in collisions with He: Rigid bender treatment of the bending-rotation interaction
• Collisional excitation of singly deuterated ammonia NH${}_2$D by H${}_2$

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