Discussion
Absorption in the infrared region excites
Answer: C
Correct answer: molecular vibrations
Infrared photons carry a few kilojoules per mole, which matches the spacing of vibrational energy levels, so absorption sets bonds stretching and bending. Electronic transitions require the much larger energies of visible and ultraviolet photons, nuclear spin transitions the much smaller energies of radiofrequency, and ejecting an electron requires more energy still.
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