Abstract Though H2CO, H2CS, H2CCC, H2CCCC, H2CCO have been identified in cool interstellar molecular clouds, identification of H2CC is still awaited. To analyze its spectrum, collisional rate coefficients are required. We have calculated collisional rate coefficients for rotational transitions between 23 levels of ortho and para H2CC for kinetic temperatures 10, 20, 30, 40, and 50K. The scattering problem is analyzed using the computer code MOLSCAT where the colliding partner is He atom. The interaction between H2CC and He has been calculated with GAUSSIAN 2003. For the interaction potential obtained with GAUSSIAN 2003, MOLSCAT is used to derive the parameters as a function of energy E of the colliding partner. After averaging the parameters over a Maxwellian distribution, the parameters as a function of the kinetic temperature T in the cloud are obtained. Finally, the collisional rate coefficients have been calculated. We have also calculated radiative transition probabilities for the transitions between the rotational levels. Finally, for ortho-H2CC, we have solved a set of statistical equilibrium equations coupled with the equations of radiative transfer and found that the H2CC may be identified through anomalous absorption of its transition at 4.89GHz.
Collisional excitation of vinylidene (H2CC)
Advances in Space Research ; 54 , 9 ; 1963-1971
2014-07-23
9 pages
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
Collisional excitation of vinylidene (H2CC)
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