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Limitations Arising from Two-Photon Absorption of Solvent in Pulsed-Laser Thermal Lens Detection: Determination of the Two-Photon Absorption Coefficient of Ethanol at 266 nm

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Abstract:

Two-photon absorption of the solvent under pulsed-laser excitation at 266 nm produces a high background thermal lens signal interfering with the analyte signal. Discrimination of both solvent and analyte signals along with calibration of the photothermal response has allowed the determination of the two-photon absorption coefficient of ethanol. The obtained value, 3.0 × 10−10 cm W−1, is close to the literature values obtained from transmittance measurements using picosecond or femtosecond laser pulses.

Keywords: ETHANOL; PULSED LASER; THERMAL LENS SPECTROMETRY; TWO-PHOTON ABSORPTION COEFFICIENT

Document Type: Research Article

DOI: http://dx.doi.org/10.1366/000370206775382802

Affiliations: Laboratoire des Sciences Analytiques, UMR 5180, Bât.-308D, Domaine Scientifique de la Doua, Université Claude Bernard-Lyon 1, 69622 Villeurbanne Cedex, France

Publication date: January 1, 2006

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