The hindered rotor density-of-states interpolation function

Creators: McClurg, Richard B.¹; Flagan, Richard C.¹; Goddard, William A., III¹

1. California Institute of Technology

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Abstract

We construct an approximation to the partition function for hindered rotors based entirely on their asymptotic behavior and no fitting parameters. The approximant is shown to be quite accurate in all temperature ranges. Explicit auxiliary functions are derived for the Helmholtz free energy, internal energy, heat capacity, and entropy. We apply this function to estimating the heat capacity and unimolecular dissociation rate for ethane.

Additional Information

Copyright © 1997 American Institute of Physics. (Received 30 October 1996; accepted 17 January 1997) This research was funded by the NSF (CHE 95-22179 and ASC 92-17368). The facilities of the MSC are also supported by grants from DOE-BCTR, Chevron Petroleum Technology, Asahi Chemial, Aramco, Owens Corning, Chevron Chemical Co., Asahi Glass, Chevron Research and Technology Co., BP Chemical, Hercules, Avery Dennison, and Beckman Institute. Erratum: "The hindered rotor density of states interpolation function" [J. Chem. Phys. 106, 6675 (1997)] Richard B. McClurg. J. Chem. Phys. 111, 7165 (1999)

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