Remote molecular composition analysis of laser-ablated material

IF 5.4 2区化学 Q1 INSTRUMENTS & INSTRUMENTATION

Applied Spectroscopy Reviews Pub Date : 2021-08-23 DOI:10.1080/05704928.2021.1966634

P. Lubin, M. Pelizzo, Jacob Erlikhman, A. Cohen, J. Madajian, P. Meinhold, G. Hughes, Nic Rupert, P. Srinivasan

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Abstract

Abstract A novel method is described for remotely interrogating bulk molecular composition of rocky materials. Laser energy heats a local area on the substrate; flux is optimized to melt and evaporate target constituents with low rates of molecular dissociation. Substrate temperature rises until an equilibrium is established between incident flux and latent phase-change energies, reaching ˜2500 K in vacuum. A blackbody signal is emitted by the heated spot, traveling outward through the evaporated material; reflective optics direct the signal into a spectrometer. Ro-vibrational absorption in the plume provides a diagnostic for identifying bulk molecular composition of the substrate. Absorption spectra are modeled for compounds with available a priori molecular cross-sections, based on laser and receiver characteristics, and target material properties. Mass ejection flux drives the plume density profile. Qualitative, species-specific spectral profiles are derived by integrating molecular cross section along a path through the plume. Simulations indicate robust absorption profiles.

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激光烧蚀材料的远程分子组成分析

摘要:提出了一种远程检测岩石材料体分子组成的新方法。激光能量加热衬底上的局部区域;优化了熔剂以低分子解离率熔化和蒸发目标成分。衬底温度上升，直到在入射通量和潜在相变能之间建立平衡，在真空中达到~ 2500 K。黑体信号由受热点发出，通过蒸发的物质向外传播;反射光学元件将信号送入分光仪。羽流中的反振动吸收为鉴定底物的大块分子组成提供了诊断方法。基于激光和接收器特性以及靶材料特性，对具有可用先验分子截面的化合物进行吸收光谱建模。物质抛射通量驱动羽流密度剖面。定性的、物种特异性的光谱剖面是通过沿羽流路径积分分子截面得到的。模拟结果表明，吸收曲线很稳定。

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来源期刊

Applied Spectroscopy Reviews 工程技术-光谱学

CiteScore

13.80

自引率

1.60%

发文量

审稿时长

1 months

期刊介绍： Applied Spectroscopy Reviews provides the latest information on the principles, methods, and applications of all the diverse branches of spectroscopy, from X-ray, infrared, Raman, atomic absorption, and ESR to microwave, mass, NQR, NMR, and ICP. This international, single-source journal presents discussions that relate physical concepts to chemical applications for chemists, physicists, and other scientists using spectroscopic techniques.