Pulsed Photothermal Deflection Spectroscopy with Optically Dense Samples

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Abstract:

The pulsed photothermal deflection spectroscopy (PTDS) method to determine the large optical absorption coefficient from the transverse PTDS magnitude and to measure spectroscopic data of optically dense sample from the normal-to-transverse magnitude ratio of the PTDS signal is presented and has been examined both theoretically and experimentally. Saturation at high absorption, effects of thermal inhomogeneity of the sample, and energy or power fluctuation of both the excitation and probe beams are avoided by this method. Together with the transverse PTDS technique, the dynamic range of spectroscopic measurement is over 9 to 10 orders of magnitude. This technique can be used with sample which is transparent or semitransparent to the probe beam.

Keywords: Dyes; Normal-to-transverse magnitude ratio; Optically dense sample; Pulsed photothermal deflection spectroscopy

Document Type: Research Article

DOI: http://dx.doi.org/10.1366/0003702953963436

Affiliations: 1: Department of Chemistry, Wuhan University, Wuhan, Hubei 430072 Peoples' Republic of China 2: Center of Analysis and Testing, Wuhan University, Wuhan, Hubei 430072 Peoples' Republic of China

Publication date: March 1, 1995

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