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Title: Rotational excitation of methanol by helium at interstellar temperatures
Author: Pottage, James
Awarding Body: Durham University
Current Institution: Durham University
Date of Award: 2002
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Calculations have been performed to obtain accurate cross-sections and thermally averaged rate coefficients for the rotational excitation of methanol by helium, using the Coupled States quantum-mechanical approach. Transitions within the ground and first torsionally excited states of A and E- type methanol were considered. The 'propensity rules' governing the collisional transitions were examined and compared with the results of microwave double resonance experiments. Predictions are made of line intensity ratios which are sensitive to the density of the He perturber and which lend themselves to the determination of the perturber densities in astrophysically interesting regions of molecular clouds.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available
Keywords: Atomic physics & molecular physics Atoms Molecules