return to home page


Transition State Vibrational Frequencies

H + CH4 = H2 + CH3

The one imaginary frequency is shown. Click on an entry for all the vibrational frequencies.
Vibrational frequency in cm-1
Methods with predefined basis sets
semi-empirical AM1 563i

Vibrational frequency in cm-1
Methods with standard basis sets
3-21G 6-31G* 6-31+G** 6-311+G(3df,2p) cc-pVDZ cc-pVTZ aug-cc-pVDZ
hartree fock HF 2202i 2244i 2232i 2200i 2126i 2195i 2131i
density functional B3LYP 1073i 1147i 1158i 1136i 994i 1133i 970i
mPW1PW91 1034i 1137i 1133i 1101i 973i   973i
Moller Plesset perturbation MP2 1962i 1864i 1757i 1665i 1558i 1642i 1548i
Quadratic configuration interaction QCISD   1754i 1663i 1566i     1451i
Coupled Cluster CCD   1900i 1796i 1710i   1696i 1591i
CCSD   1768i          
For descriptions of the methods (AM1, HF, MP2, ...) and basis sets (3-21G, 3-21G*, 6-31G, ...) see the glossary in section I.C. Predefined means the basis set used is determined by the method.