Quantum Chemistry 5.6 - Diatomic Infrared Spectra

[@shankarnarayan1234]

You are seriously underrated, many textbooks take chapters to teach all this but still manage to confuse students, while u tackled this in a matter of few mins in a simple way Thanks a lot!!

[@TheLastWizardOfTheCentury-u7o]

Thanks, applications really help to visualize the concept a bit.

[@TMPChem]

Glad to provide a different perspective to help things along.

[@krzysztofnapiontek8971]

Constant k is not derivated here. It is parameter tuned to match experimental data. Is there a better model which can be derivated only from physical properties?

[@amyliu2394]

Thank you so much

[@akashsuryawanshi6267]

you sir, are the god.

[@rustman1984]

Wouldn't the units for Nu be 1/(rad*s)?

[@TMPChem]

The units for omega would be, but not for nu (angular velocity vs. frequency, respectively), but radians are unitless, thus including them is redundant unless done so for clarity or some other special purpose. The SI units of radians are meters per meter (ratio of a unit circle's arc length relative to radius), and thus cancel out to become unitless.

[@Lintze]

You cannot see the 19F-19F vibrational transitions in infrared since it does not have a dipole moment

[@TMPChem]

Correct, which is why it was a bad example to choose. Tried to go with something besides the standard choices of HF, HCl, or CO. Ended up picking something with no net dipole moment. Yikes. Though the frequency can still be observed in a Raman vibrational spectrum, so I suppose the problem could be re-branded as "what would we derive as the spring constant for F-F from IR spectroscopy if this molecule had a net dipole moment". The peak still exists in principle, it just unfortunately has an intensity of zero.