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## Main Question or Discussion Point

Dear all,

Any quantum mechanical software (e.g., Gaussian03) can compute the fundamental frequencies (3N-6) and force constant for each frequency..

I don't understand exactly about force constant..??

For a particular mode of vibration what does this force constant mean?

For a molecular with 2 atoms we can tell force constant is between two atoms..but for polyatomic molecules is there any good way to understand??

thanks

Any quantum mechanical software (e.g., Gaussian03) can compute the fundamental frequencies (3N-6) and force constant for each frequency..

I don't understand exactly about force constant..??

For a particular mode of vibration what does this force constant mean?

For a molecular with 2 atoms we can tell force constant is between two atoms..but for polyatomic molecules is there any good way to understand??

thanks