Pulsed‐Laser Excited Differential Photothermal Deflection Spectrometry

Document Type

Article

Journal/Book Title

Applied Spectroscopy

Publication Date

1992

Volume

46

First Page

1335

Abstract

This paper describes a differential photothermal optical absorbance apparatus that uses two excitation beams at different wave-lengths. A single probe beam monitors the difference in heats generated by the two wavelengths. The theory is developed for the operational principles of the apparatus, and theoretical signals are compared with those obtained with a conventional absorption spectrophotometer. The differential photothermal apparatus has a theoretical advantage over conventional spectrophotometry for samples with less than unit absorbance. Experiments are described which verify the operating principles and demonstrate the flexibility of the apparatus.

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