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PRESSURE-INDUCED WIDTHS AND SHIFTS OF METHANE TRANSITIONS

Please use this identifier to cite or link to this item: http://hdl.handle.net/1811/18436

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Title: PRESSURE-INDUCED WIDTHS AND SHIFTS OF METHANE TRANSITIONS
Creators: Neshyba, S. P.; Lynch, R.; Gamache, Robert R.
Issue Date: 1993
Abstract: A new implementation of linewidth $theory,^{1-3}$ which yields line-widths and shifts together, is applied to air-broadened spectroscopic lines of methane. We include long-range (electrostatic) interactions, as well as short-range ones given by atom-atom Lennard-Jones terms. The latter are derived in a spherical tensor expansion to sixth order in the intermolecular separation, using a generalised computer-assisted analytic procedure. Complex-valued integrals describing the intermolecular dynamics ("resonance functions") are evaluated analytically in the parabolic $approximation,^{3}$ and compared to results got by exact numerical solution to Hamilton's equations. Results are compared to experimental measurements, with particular attention to observed large changes in angular momentum resulting from a single $collision.^{4}$
URI: http://hdl.handle.net/1811/18436
Other Identifiers: 1993-FD-6
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