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- W2345315739 abstract "It is well known that opto-acoustic (OA) spectroscopy is the most sensitive technique to detect small absorptions in the gas phase. In the condensed phases, sensi-tivity has been severely limited by the use of gas phase microphones1 for acoustic detection. In the past few years, various authors2–7 have realized that piezoelectric transducers, in direct contact with a liquid, give much higher OA detection sensitivities than conventional microphones, because of the large acoustic impedance of liquids. We have recently demonstrated,8,9 for the first time, that the combination of a pulsed dye laser, submersed piezoelectric transducer, and gated OA detection can be advantageously used to measure weak absorption spectra (linear or nonlinear absorptions) in liquids. Our pulsed OA spectroscopy method can presently provide a detection limit of 10−9 J of absorbed optical energy per cm path length, corresponding to an absorption coefficient of 10−6 cm−1 for our typical laser pulse energy of 1 mJ. Improvement by at least a factor ~10 in the detection limit seems possible. We have applied this technique to a variety of novel liquid state spectroscopy measurements including (1) determination of the absorption spectra of high harmonics (up to 8th) of the C-H stretch in organic liquids,10 (2) a first accurate determination of the visible spectra of water and heavy water,11 (3) OA Raman gain spectroscopy,12 and (4) two-photon OA absorption spectroscopy.13" @default.
- W2345315739 created "2016-06-24" @default.
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- W2345315739 date "1979-01-01" @default.
- W2345315739 modified "2023-09-24" @default.
- W2345315739 title "Pulsed Opto-Acoustic Spectroscopy of Liquids" @default.
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- W2345315739 doi "https://doi.org/10.1007/978-3-540-38950-7_80" @default.
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