ABSTRACT

A. N. Dharamsi and A. Hassam, "On the feasibility of non-thermal optoacoustic spectroscopy of solids", Applied Spectroscopy, 43,p345, 1989.

In conventional spectroscopy an incident laser beam is absorbed by the sample, the radiant energy is converted to heat, and the sample undergoes a thermal expansion, generating an acoustic wave that is detected. The incident light is from either a CW modulated or a pulsed laser. laser. We discuss the feasibility of a variation of conventional optoacoustic spectroscopy, which can be used to investigate solids. A major difference between conventional optoacoustic spectroscopy and the method discussed here is that in the latter the incident radiant energy is converted directly into acoustic energy. The acoustic wave is not the result of thermal expansion, but is, rather, the result of electronic dilation or photostriction.


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