Shifted excitation Raman difference spectroscopy: A promising tool for the investigation of soil

L.S. Theurer, M. Maiwald, B. Sumpf

Published in:

Eur. J. Soil Sci., vol. 72, no. 1, pp. 120-124 (2021).

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Abstract:

In this paper we demonstrate shifted excitation Raman difference spectroscopy (SERDS) for soil analysis as a proof of concept. Confocal Raman microscopy is performed for sample analysis as well as for qualitative comparison with our SERDS experiments. Raman spectra of a soil sample show huge background signals, which mask weak Raman peaks. SERDS clearly separates the Raman signals from background signals with a 10-fold improvement of the signal-to-background noise ratio. Thus, besides hydroxyapatite, additional Raman bands from quartz and feldspar could be extracted. The results demonstrate SERDS as a promising tool for soil analysis.

Lasers Sensors Lab, Ferdinand-Braun-Institut, Leibniz-Institut für Höchstfrequenztechnik, Gustav-Kirchhoff-Str. 4, 12489 Berlin, Germany

Keywords:

diode laser, optical sensor, phosphate, Raman spectroscopy, soil analysis