Raman spectra of organic acids obtained using a portable instrument at -5 °C in a mountain area at 2000 m ASL

Raman spectra of organic acids obtained using a portable instrument at -5 °C in a mountain area at 2000 m above sea level

Journal of Raman Spectroscopy, 2010, 41, 440-444
J. Jehlicka, P. Vitek, H. G. M. Edwards

Abstract: Well-resolved Raman spectra of organic acids were obtained with 785 nm excitation using a portable Raman instrument (Ahura First Defender XL) under low-temperature -5 °C atmospheric conditions at an altitude of 2000 m (Axamer Lizum, Innental, Austria). The portable Raman spectrometer tested in this setting permits fast and unambiguous detection of solid forms of these organic acids (formic, acetic, valeric, hexanoic, heptanoic, isophthalic, ascorbic and mellitic) under field conditions. This demonstrates the possibility to use a miniaturized Raman spectrometer as a key instrument for investigating the presence of organic compounds and biomolecules under low temperature conditions. These results are important for future missions focusing not only on Mars, where Raman spectroscopy will be a key non-destructive analytical tool for the in situ identification of organic compounds relevant to life detection on planetary surfaces or near sub-surfaces.