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Biochemistry, Biophysics, and Structural Biology Commons

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2002

Ames Laboratory Publications

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Full-Text Articles in Biochemistry, Biophysics, and Structural Biology

Quantitative Depth Profiling Using Saturation-Equalized Photoacoustic Spectra, Roger W. Jones, John F. Mcclelland Apr 2002

Quantitative Depth Profiling Using Saturation-Equalized Photoacoustic Spectra, Roger W. Jones, John F. Mcclelland

Ames Laboratory Publications

Depth profiling using photoacoustic spectra taken at multiple scanning speeds or modulation frequencies is normally impaired by the increase in spectral saturation that occurs with decreasing speed or frequency. Photothermal depth profiling in general is also impeded by the ill conditioned nature of the mathematical problem of determining a depth profile from photothermal data. This paper describes a method for reducing the saturation level in low-speed or low-frequency spectra to the level at high speed or frequency so that all spectra have the same saturation. The conversion method requires only magnitude spectra, so it is applicable to both conventional and ...