Time-Resolved Impulse Photoacoustic Measurements by Step-Scan FT-IR Spectrometry

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An impulse/response approach for measuring photoacoustic spectra is described. Instead of the usual modulation from either a chopper or an interferometric phase modulation, a radiation pulse is used to generate the photoacoustic (PA) signal at each step of a step-scan FT-IR spectrometer. The signal from the PA cell is recorded as a time-resolved sequence. The time-dependent photoacoustic signal reveals depth-profiling information for solid samples. Examples of time-resolved impulse photoacoustic spectra (TRIPAS) of gas and solid samples are presented.

Keywords: Depth-profiling; Photoacoustic; Step-scan FT-IR; Time-resolved

Document Type: Rapid Communication

DOI: http://dx.doi.org/10.1366/0003702963905457

Affiliations: 1: Du Pont, Agricultural Products, Experimental Station, Wilmington, Delaware 19800-0323 2: Manning Applied Technology, 121 Sweet Avenue, Moscow, Idaho 83843

Publication date: July 1, 1996

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