A current examine revealed in Utilized Spectroscopy presents a easy but strong technique for enhancing the precision of Raman spectroscopy measurements performed by the SHERLOC instrument on NASA’s Perseverance rover (1). The examine, titled “Calibration of Raman Bandwidths on the Scanning Liveable Environments with Raman and Luminescence for Organics and Chemical substances (SHERLOC) Deep Ultraviolet Raman and Fluorescence Instrument Aboard the Perseverance Rover,” was performed by lead creator Ryan S. Jakubek and his group on the NASA Johnson Area Middle, in Houston, Texas, and it gives an answer to an necessary problem spectroscopists face when attempting to precisely calibrate Raman spectral bandwidths (1).
These spectral bandwidths, that are influenced by each intrinsic Raman bands (IRB) and instrumental artifacts, play a key function in serving to us perceive the exact chemical composition of Martian samples. The novel method proposed by Jakubek and group entails modeling the noticed Raman bands as a convolution of a Lorentzian IRB and a Gaussian instrument slit perform (1).
Of their examine, the researchers intently examined the calibration goal information. By doing so, they have been in a position to decide that SHERLOC possesses a slit perform width of 34.1 cm–1 (1). Realizing this data influenced how they performed the remainder of their experiment. First, they have been in a position to deconvolve the IRB from the noticed Raman band, offering a clearer and extra correct illustration of the intrinsic bandwidth, free from instrumental artifacts (1). The correlation between the noticed Raman bandwidth and intrinsic Raman bandwidth was introduced in a concise desk, providing a fast estimation instrument for spectroscopists working with SHERLOC information (1).
The researchers additionally delved deeper into their examine by making use of the calibration to mannequin the SHERLOC spectrum of olivine. Olivine is a mineral wealthy in magnesium and iron, and it has been recognized on Mars via spectroscopic evaluation, providing insights into the planet’s geological historical past (1). The presence of olivine suggests previous volcanic exercise and helps scientists piece collectively the narrative of Mars’ historic floor composition.
Importantly, the researchers talk about the restrictions of the mannequin and supply a quantitative technique for calculating related errors, emphasizing the transparency and rigor utilized of their calibration method. As Mars continues to be a spotlight of scientific exploration, these developments in spectroscopic precision promise to deepen our understanding of the Purple Planet’s geology and potential habitability.
This analysis not solely contributes to the evolving discipline of planetary spectroscopy but additionally exemplifies the ingenuity and dedication of the scientific neighborhood in unraveling the mysteries of our photo voltaic system.
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(1) Jakubek, R.S.; Bhartia, R.; Uckert, Okay., et al. Calibration of Raman Bandwidths on the Scanning Liveable Environments with Raman and Luminescence for Organics and Chemical substances (SHERLOC) Deep Ultraviolet Raman and Fluorescence Instrument Aboard the Perseverance Rover. Appl. Spectrosc. 2023, ASAP. DOI: 10.1177/000370282312108