Question

Why are the I. R. spectra of homonuclear molecular note observed?
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Answer 1

Answer:

Since the electric dipole moment of the homonuclear diatomics is zero, the fundamental vibrational transition is electric-dipole-forbidden and the molecules are infrared inactive. ... The spectra of these molecules can be observed by Raman spectroscopy because the molecular vibration is Raman-allowed.

Answer 2

Answer:

A homonuclear gas (that is N2 or O2), will not show an infrared spectrum in a spectrometer. It is because their spectrum is also stefan-boltzmann, that is their spectra is also blackbody therefore they have the same spectra as the blackbody radiation within the spectrometer.

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