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Durham e-Theses
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Rotational excitation of methanol by helium at interstellar temperatures

Pottage, James (2002) Rotational excitation of methanol by helium at interstellar temperatures. Doctoral thesis, Durham University.



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.

Item Type:Thesis (Doctoral)
Award:Doctor of Philosophy
Thesis Date:2002
Copyright:Copyright of this thesis is held by the author
Deposited On:26 Jun 2012 15:22

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