期刊
JOURNAL OF CHEMICAL PHYSICS
卷 155, 期 7, 页码 -出版社
AMER INST PHYSICS
DOI: 10.1063/5.0060310
关键词
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资金
- KU Leuven Research Council [C14/16/063]
- FWO (Research Foundation-Flanders) [12V4419N, 12V4422N]
- Chinese Scholarship Council (CSC)
- National Research Council Joint Laboratories program [SAC.AD002.026]
- University de Lyon [ANR-16-IDEX-0005]
- University Claude Bernard Lyon 1 through the BQR Accueil EC 2019 grant
This work presents simultaneous spectroscopy of specific heat and thermal expansivity of glycerol using a wideband time-resolved thermal lens technique. An analytical model accurately describes TL transients in a relaxing system subjected to impulsive laser heating. The results extend specific heat and thermal expansion spectroscopy by nearly three and eight decades, respectively, allowing for assessment of relaxation strength and frequency up to sub-100 MHz.
This work reports results on the simultaneous spectroscopy of the specific heat and thermal expansivity of glycerol by making use of a wideband time-resolved thermal lens (TL) technique. An analytical model is presented which describes TL transients in a relaxing system subjected to impulsive laser heating. Experimentally, a set of TL waveforms, from 1 ns to 20 ms, has been recorded for a glycerol sample upon supercooling, from 300 to 200 K. The satisfactory fitting of the TL signals to the model allows the assessment of relaxation strength and relaxation frequency of the two quantities up to sub-100 MHz, extending the specific heat and thermal expansion spectroscopy by nearly three and eight decades, respectively. Fragility values, extracted from the relaxation behavior of the specific heat and the thermal expansion coefficient, are found to be similar, despite a substantial difference in relaxation strength.
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