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[×ÊÔ´] Vibrational Analysis in Gaussian

Joseph W. Ochterski, Ph.D.
help@gaussian.com
October 29, 1999
Abstract
One of the most commonly asked questions about Gaussian is \What is the de nition
of reduced mass that Gaussian uses, and why is is di erent than what I calculate
for diatomics by hand?" The purpose of this document is to describe how Gaussian calculates
the reduced mass, frequencies, force constants, and normal coordinates which
are printed out at the end of a frequency calculation.
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