# Example: Analytic Frequencies: CH4¶

Download CH4_SecDeriv.run

#! /bin/sh

# In this example we perform a geometry optimization immediately followed by
# calculation of frequencies. This is done by setting the task to
# GeometryOptimization and by requesting the normal modes in Properties block

# Note: when using this feature, one might improve the precision if one uses
# NumericalQuality Good. In order to save time this is not done in this example.

\$AMSBIN/ams <<eor
System
atoms
C  0.0                 0.0                 0.0
H  0.6264250420707439  0.6264250420707439  0.6264250420707439
H  0.6264250420707439 -0.6264250420707439 -0.6264250420707439
H -0.6264250420707439  0.6264250420707439 -0.6264250420707439
H -0.6264250420707439 -0.6264250420707439  0.6264250420707439
end
end

GeometryOptimization
Convergence
End
End

Properties
NormalModes Yes
End