Spectral Background Calibration of Scanning Habitable Environments with Raman and Luminescence for Organics and Chemicals (SHERLOC) Spectrometer Onboard the Perseverance Rover Enables Identification of a Ubiquitous Martian Spectral Component.

IF 2.2 3区 化学 Q2 INSTRUMENTS & INSTRUMENTATION Applied Spectroscopy Pub Date : 2024-10-03 DOI:10.1177/00037028241280081
Ryan S Jakubek, Andrea Corpolongo, Rohit Bhartia, Richard V Morris, Kyle Uckert, Sanford A Asher, Aaron S Burton, Marc D Fries, Kevin Hand, William F Hug, Carina Lee, Francis M McCubbin, Eva L Scheller, Sunanda Sharma, Sandra Siljeström, Andrew Steele
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Abstract

The Perseverance rover landed at Jezero crater, Mars, on 18 February 2021, with a payload of scientific instruments to examine Mars' past habitability, look for signs of past life, and process samples for future return to Earth. The instrument payload includes the Scanning Habitable Environments with Raman and Luminescence for Organics and Chemicals (SHERLOC) deep ultraviolet Raman and fluorescence imaging spectrometer designed to detect, characterize, and map the presence of organics and minerals on the Martian surface. Operation and engineering constraints sometimes result in the acquisition of spectra with features near the detection limit. It is therefore important to separate instrumental (background) spectral components and spectral components inherent to Martian surface materials. For SHERLOC, the instrumental background is assessed by collecting spectra in the stowed-arm configuration where the instrument is pointed at the Martian nighttime sky with no surface sample present in its optical path. These measurements reveal weak Raman and fluorescence background spectral signatures as well as charged-coupled device pixels prone to erroneous intensity spikes separate from cosmic rays. We quantitatively describe these features and provide a subtraction procedure to remove the spectral background from surface spectra. By identifying and accounting for the SHERLOC Raman background features within the median Raman spectra of Martian target scans, we find that the undefined silicate spectral feature interpreted to be either amorphous silicate or plagioclase feldspar is ubiquitously found in every Mars target Raman scan collected through Sol 751.

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毅力号漫游者上的有机物和化学物质拉曼及发光扫描宜居环境(SHERLOC)光谱仪的光谱背景校准,确定了一种普遍存在的火星光谱成分。
毅力号 "漫游车于2021年2月18日在火星杰泽罗陨石坑着陆,其有效载荷包括一套科学仪器,用于检查火星过去的宜居性,寻找过去生命的迹象,并处理样本以便将来返回地球。仪器有效载荷包括有机物和化学品拉曼和荧光扫描宜居环境(SHERLOC)深紫外拉曼和荧光成像光谱仪,旨在探测、描述和绘制火星表面有机物和矿物的存在。操作和工程限制有时会导致采集到的光谱特征接近探测极限。因此,必须将仪器(背景)光谱成分和火星表面材料固有的光谱成分区分开来。对于 SHERLOC 来说,仪器背景是通过在收放臂配置下采集光谱来评估的,在收放臂配置下,仪器指向火星夜空,其光路中没有表面样本。这些测量结果显示了微弱的拉曼和荧光背景光谱特征,以及容易出现与宇宙射线分离的错误强度峰值的带电耦合器件像素。我们对这些特征进行了定量描述,并提供了一种从表面光谱中去除光谱背景的减法程序。通过识别和计算火星目标拉曼光谱中位数扫描中的 SHERLOC 拉曼背景特征,我们发现在至 751 日收集的每一个火星目标拉曼光谱扫描中都普遍存在未定义的硅酸盐光谱特征,这种特征被解释为无定形硅酸盐或斜长石。
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来源期刊
Applied Spectroscopy
Applied Spectroscopy 工程技术-光谱学
CiteScore
6.60
自引率
5.70%
发文量
139
审稿时长
3.5 months
期刊介绍: Applied Spectroscopy is one of the world''s leading spectroscopy journals, publishing high-quality peer-reviewed articles, both fundamental and applied, covering all aspects of spectroscopy. Established in 1951, the journal is owned by the Society for Applied Spectroscopy and is published monthly. The journal is dedicated to fulfilling the mission of the Society to “…advance and disseminate knowledge and information concerning the art and science of spectroscopy and other allied sciences.”
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