Abstract
AbstractPhotoacoustic spectra of the biological molecules thymine, adenine, tyrosine, ergosterol and polyadenylic acid were obtained in the 300‐130 nm region of photon wavelength using synchrotron radiation as a light source. Photoacoustic measurements were performed with thin solid films of these molecules made by vacuum evaporation, except for polyadenylic acid whose thin films were made from the aqueous solution. It was found that the spectra exhibit absorption structures which are in good agreements with those found from conventional transmission measurements. Some of the spectra, however, exhibit a marked deviation from the transmission data in the region below 145 nm, which may be indicative of photon absorption with subsequent photoelectron emission.
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