Thermal effects of the excitation laser power on carbonaceous meteorite Northwest Africa 6603 by Raman spectroscopy: an undergraduate research project

IF 1.1 4区 化学 Q3 SPECTROSCOPY
Mohamed U. Zakariya, Conan Bock, R. Kayastha, A. Dall’Asén
{"title":"Thermal effects of the excitation laser power on carbonaceous meteorite Northwest Africa 6603 by Raman spectroscopy: an undergraduate research project","authors":"Mohamed U. Zakariya, Conan Bock, R. Kayastha, A. Dall’Asén","doi":"10.1080/00387010.2023.2193628","DOIUrl":null,"url":null,"abstract":"Abstract Raman spectroscopy has been used extensively on meteoritic samples since it is a nondestructive tool that provides information about their structure and mineralogical composition, which can give important clues about planet formation. However, the power of the excitation laser used in this technique can alter the properties of the samples due to thermal effects. In this undergraduate research work, the laser-induced thermal effects produced on the carbonaceous chondritic meteorite Northwest Africa 6603 were studied in detail by analyzing the low- and high-resolution Raman spectra parameters of the minerals found in the inclusions and matrix of this sample as a function of the excitation power. Olivine (forsterite), graphitic carbon, pyroxene (enstatite), hematite and gehlenite were the minerals identified in the studied regions. The Raman parameters of these minerals were affected by the laser power to a greater or lesser extent, indicating an increase in structural disorder. In general, the alterations observed were permanent (reverse changes were not observed). These thermal effects were correlated with the topography of the irradiated regions by analyzing their changes using optical microscopy. The micrographs of a few regions showed changes on their topography after irradiating the regions with the maximum applied power (e.g., more depressed areas). These findings exhibited strong evidence of the thermal effects induced by the laser power on the materials found in this fragment, which must be considered to avoid alterations of the physical and chemical properties of the meteoritic samples. In addition, this work presents the first study done on the mineralogical composition of Northwest Africa 6603 using Raman spectroscopy. Furthermore, from an educational standpoint, this project exposed the involved undergraduate physics students to numerous research steps (e.g., experiment preparation, data acquisition/analysis, and manuscript preparation) which provided them with a broad spectrum of valuable scientific and technical tools for their future careers.","PeriodicalId":21953,"journal":{"name":"Spectroscopy Letters","volume":"56 1","pages":"183 - 193"},"PeriodicalIF":1.1000,"publicationDate":"2023-03-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Spectroscopy Letters","FirstCategoryId":"92","ListUrlMain":"https://doi.org/10.1080/00387010.2023.2193628","RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q3","JCRName":"SPECTROSCOPY","Score":null,"Total":0}
引用次数: 0

Abstract

Abstract Raman spectroscopy has been used extensively on meteoritic samples since it is a nondestructive tool that provides information about their structure and mineralogical composition, which can give important clues about planet formation. However, the power of the excitation laser used in this technique can alter the properties of the samples due to thermal effects. In this undergraduate research work, the laser-induced thermal effects produced on the carbonaceous chondritic meteorite Northwest Africa 6603 were studied in detail by analyzing the low- and high-resolution Raman spectra parameters of the minerals found in the inclusions and matrix of this sample as a function of the excitation power. Olivine (forsterite), graphitic carbon, pyroxene (enstatite), hematite and gehlenite were the minerals identified in the studied regions. The Raman parameters of these minerals were affected by the laser power to a greater or lesser extent, indicating an increase in structural disorder. In general, the alterations observed were permanent (reverse changes were not observed). These thermal effects were correlated with the topography of the irradiated regions by analyzing their changes using optical microscopy. The micrographs of a few regions showed changes on their topography after irradiating the regions with the maximum applied power (e.g., more depressed areas). These findings exhibited strong evidence of the thermal effects induced by the laser power on the materials found in this fragment, which must be considered to avoid alterations of the physical and chemical properties of the meteoritic samples. In addition, this work presents the first study done on the mineralogical composition of Northwest Africa 6603 using Raman spectroscopy. Furthermore, from an educational standpoint, this project exposed the involved undergraduate physics students to numerous research steps (e.g., experiment preparation, data acquisition/analysis, and manuscript preparation) which provided them with a broad spectrum of valuable scientific and technical tools for their future careers.
喇曼光谱法研究激发激光功率对西北非洲6603碳质陨石的热效应
摘要拉曼光谱作为一种无损工具,可以提供有关陨石结构和矿物成分的信息,为行星形成提供重要线索,因此在陨石样品上得到了广泛应用。然而,由于热效应,该技术中使用的激发激光的功率可能会改变样品的性质。在这项本科生研究工作中,通过分析在该样品的包裹体和基质中发现的矿物的低分辨率和高分辨率拉曼光谱参数作为激发功率的函数,详细研究了激光对碳质球粒陨石西北非洲6603产生的热效应。橄榄石(镁橄榄石)、石墨碳、辉石(顽火辉石)、赤铁矿和葛莱石是研究区域内确定的矿物。这些矿物的拉曼参数或多或少受到激光功率的影响,表明结构无序性增加。一般来说,观察到的变化是永久性的(没有观察到反向变化)。通过使用光学显微镜分析这些热效应的变化,将这些热效应与辐照区域的形貌相关联。一些区域的显微照片显示,在用最大施加功率照射这些区域后,它们的形貌发生了变化(例如,更凹陷的区域)。这些发现有力地证明了激光功率对碎片中发现的材料产生的热效应,必须考虑这一点,以避免陨石样品的物理和化学性质发生变化。此外,这项工作首次使用拉曼光谱对西北非洲6603的矿物学成分进行了研究。此外,从教育的角度来看,该项目让物理学本科生接触到了许多研究步骤(如实验准备、数据采集/分析和手稿准备),为他们未来的职业生涯提供了广泛的有价值的科学和技术工具。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
求助全文
约1分钟内获得全文 求助全文
来源期刊
Spectroscopy Letters
Spectroscopy Letters 物理-光谱学
CiteScore
2.90
自引率
5.90%
发文量
50
审稿时长
1.3 months
期刊介绍: Spectroscopy Letters provides vital coverage of all types of spectroscopy across all the disciplines where they are used—including novel work in fundamental spectroscopy, applications, diagnostics and instrumentation. The audience is intended to be all practicing spectroscopists across all scientific (and some engineering) disciplines, including: physics, chemistry, biology, instrumentation science, and pharmaceutical science.
×
引用
GB/T 7714-2015
复制
MLA
复制
APA
复制
导出至
BibTeX EndNote RefMan NoteFirst NoteExpress
×
提示
您的信息不完整,为了账户安全,请先补充。
现在去补充
×
提示
您因"违规操作"
具体请查看互助需知
我知道了
×
提示
确定
请完成安全验证×
copy
已复制链接
快去分享给好友吧!
我知道了
右上角分享
点击右上角分享
0
联系我们:info@booksci.cn Book学术提供免费学术资源搜索服务,方便国内外学者检索中英文文献。致力于提供最便捷和优质的服务体验。 Copyright © 2023 布克学术 All rights reserved.
京ICP备2023020795号-1
ghs 京公网安备 11010802042870号
Book学术文献互助
Book学术文献互助群
群 号:481959085
Book学术官方微信