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Calibration of Raman Bandwidths on the Scanning Habitable Environments with Raman and Luminescence for Organics and
Ryan S Jakubek1, Rohit Bhartia2, Kyle Uckert3
1Jacobs, NASA Johnson Space Center, Houston, Texas, USA.
Applied Spectroscopy
|November 15, 2023
Summary
We developed a simple calibration method to accurately measure Raman bandwidths for the SHERLOC instrument on the Perseverance rover. This technique removes instrumental effects, revealing intrinsic sample properties for better analysis.
Area of Science:
- Planetary Science
- Spectroscopy
- Instrument Calibration
Background:
- Raman spectroscopy is crucial for analyzing planetary samples.
- Instrumental artifacts can distort observed Raman bandwidths, complicating analysis.
- Accurate calibration is needed to understand intrinsic sample properties.
Purpose of the Study:
- To develop a simple method for calibrating Raman bandwidths for the SHERLOC instrument.
- To separate intrinsic Raman band (IRB) width from instrumental effects.
- To enable accurate correlation of bandwidth to sample properties.
Main Methods:
- Modeled observed Raman bands as a convolution of Lorentzian IRB and Gaussian slit function.
- Used calibration target data to determine SHERLOC's slit function width.
- Developed a quantitative error calculation method for the calibration.
Main Results:
- Calculated SHERLOC's slit function width to be 34.1 cm⁻¹.
- Provided a method to deconvolve IRB from observed bands.
- Presented a table for quick estimation of intrinsic Raman bandwidths.
Conclusions:
- The developed method allows for accurate determination of intrinsic Raman bandwidths.
- This calibration enhances the analysis of SHERLOC data, including sulfates and olivine.
- The findings improve the interpretation of chemical and mineralogical data from Mars.
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