Evaluation of handheld and portable Raman spectrometers with different laser excitation wavelengths for the detection and characterization of organic minerals

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11310%2F20%3A10416756" target="_blank" >RIV/00216208:11310/20:10416756 - isvavai.cz</a>

Result on the web

<a href="https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=6ou.NnUmRy" target="_blank" >https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=6ou.NnUmRy</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.saa.2020.118818" target="_blank" >10.1016/j.saa.2020.118818</a>

Result language

angličtina

Original language name

Evaluation of handheld and portable Raman spectrometers with different laser excitation wavelengths for the detection and characterization of organic minerals

Original language description

Organic minerals occur rather rarely in some types of peat bogs, sedimentary geological environments, and hydrothermal veins. Commonly, calcium oxalates are produced by several plants, terpenoids are often associated with conifers. Because of the organic precursor, these minerals, from the smallest group of the mineralogical system, are sometimes considered as biomarkers. Potential detection of these compounds has high relevance in the fields of exobiology or geobiology. Here we show the potential of four portable Raman spectrometers, using different excitation wavelengths and technologies (operating at 532, 785, and 1064 nm together with an advanced spectrometer using the sequentially shifted excitation (SSE) technology), for the rapid and non-destructive identification of these phases. For the organic minerals investigated here, the most intense Raman bands are generally detected at the expected wavenumber positions +/- 1-4 cm(-1) in the region 100-2000 cm(-1) in the spectra obtained from all spectrometers. Additionally, two spectrometers (the 532 nm instrument and the SSE) are capable of detecting Raman bands in the higher wavenumber shift region of 2000-3500 cm(-1), allowing the more detailed characterization and differentiation of the related phases. From this work, and on the basis of the experimental data obtained, it is clear that the longer laser excitation wavelengths are more preferable for organic minerals identification due to the better mitigation of fluorescence emission. In contrast, the Raman spectrometer equipped with the shortest excitation wavelength (532 nm) gives a significantly higher spectral resolution and a more detailed discrimination of the Raman bands, provided that the conditions of general lower level of fluorescence emission are met. The results presented in the current study complement the knowledge on minerals and biomarkers of relevance for Martian environments which have been measured with mobile Raman spectrometers. The outcome creates a solid base towards the use of lightweight mobile Raman systems that can be used outdoors and on terrestrial outcrops. Moreover, these results and conclusions are of use for the further development of dedicated spectrometers destined for the instrumental suites on planetary rovers, in the frame of the forthcoming exobiology focused missions to Mars to be launched by NASA and ESA.

Czech name

—

Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

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OECD FORD branch

10505 - Geology

Project

—

Continuities

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year

2020

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

Spectrochimica Acta - Part A: Molecular and Biomolecular Spectroscopy

ISSN

1386-1425

e-ISSN

—

Volume of the periodical

243

Issue of the periodical within the volume

December

Country of publishing house

GB - UNITED KINGDOM

Number of pages

15

Pages from-to

118818

UT code for WoS article

000576843300005

EID of the result in the Scopus database

2-s2.0-85089842972