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August 29, 2014

Homework Help: Quantum Physics

Posted by Sue on Sunday, March 11, 2007 at 12:41pm.

How is it a substance can emit photons of visible light after absorbing ultra violet photons but not with infrared
radiation

The re-emitted photons must be of lessor energy (longer wavelength) than the incident photons.

In a one-photon absorption process, the absorbed photon must have more energy that the re-emitted visible photon. Infrared phtns have less energy thn visible ones because of their lower frequency.

When you irradiate a material with high-intensity infrared laser light, it IS possible to obtain visible emission, with negligible heating, because of multiple-photon absorption and scattering processes that can occur. You do not see this occur in everyday processes, but I have observed it in the laboratry. So, the premise of your question is not quite correct. Tell your teacher and score some extra brownie points.

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