Collisional excitation of vinylidene (H2CC) |
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Authors: | MK Sharma Monika Sharma UP Verma Suresh Chandra |
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Institution: | 1. School of Studies in Physics, Jiwaji University, Gwalior 474 011, M.P., India;2. Department of Physics, Lovely Professional University, Phagwara 144411, Punjab, India |
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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 50 K. 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 q(L,M,M′|E) as a function of energy E of the colliding partner. After averaging the parameters q(L,M,M′|E) over a Maxwellian distribution, the parameters Q(L,M,M′|T) as a function of the kinetic temperature T in the cloud are obtained. Finally, the collisional rate coefficients have been calculated. |
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Keywords: | ISM: molecules H2CC molecule Collisional rate coefficients Radiative transfer |
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