Abstract
Good agreement between theory and experiment is found for photoacoustic (PA) signal enhancement by volatile liquids adsorbed on solid samples in a microphonic cell illuminated with visible light. When the same solid samples are illuminated with synchrotron X-radiation significantly smaller PA signal enhancements are observed than are predicted by theory because of radiolysis of the liquid vapors. The introduction of the volatile liquids is nevertheless valuable for the X-ray photoacoustic measurements because it raises the signal above the threshold for detectability.
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