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P.","year":"1993"},{"key":"ja010703wb00026\/ja010703wb00026_2","doi-asserted-by":"crossref","first-page":"1","DOI":"10.1016\/0022-328X(91)83081-E","volume":"403","author":"Leal J. P.","year":"1991","journal-title":"J. Organomet. Chem."},{"key":"ja010703wb00027\/ja010703wb00027_1","unstructured":"An important requirement of the PAC technique is that the thermoelastic properties of the solution used in the calibration and those of the sample solution, namely their adiabatic expansion coefficient\u03c7(eq 8), should be identical. Since the solutions used are normally very diluted, it is generally assumed that both will have\u03c7equal to that of the pure solvent. There has been a nagging doubt as to whether this assumption is valid for the experiments based on the approach illustrated in Scheme 1, due to the fact that the sample solution contains ca. 7% (v\/v) of di-tert-butylperoxide, whereas the calibration contains none. The same doubt applies to the experiments reported in this paper. We are currently investigating this matter by determining experimental values of\u03c7for the solutions involved. However, all the available evidence seems to corroborate the assumption:\u2009 (1) the shape and time-of-flight of the photoacoustic waveform are the same for calibration and experiment; (2) increasing the amount of peroxide in the sample solution does not noticeably affect the time-of-flight of the photoacoustic waveform; (3) a plot of the photoacoustic signal versus the amount of peroxide added during the experiment remains linear even beyond 12% (v\/v) of peroxide in solution (ref 8, see also Clark, K. 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