Kelly Evan M, Egan Miles J, Colόn Arelis, Angel S Michael, Sharma Shiv K
Hawaii Institute of Geophysics and Planetology, University of Hawaii at Manoa, Honolulu, Hawaii, USA.
Department of Chemistry and Biochemistry, University of South Carolina, Columbia, South Carolina, USA.
Appl Spectrosc. 2024 Oct;78(10):1062-1070. doi: 10.1177/00037028241257961. Epub 2024 Jun 10.
Raman spectroscopy allows for the unambiguous identification of materials through the inelastic scattering of light. This technique has a great many uses in various aspects of society from academic, scientific, and industry. This paper explores a specific type of Raman spectrometer called a spatial heterodyne Raman spectrometer (SHRSy), which is a variation of an interferometric spectrometer. It utilizes a Michelson interferometer and replaces the mirrors with gratings that transform it from a time-domain spectrometer to a spatial-domain spectrometer, allowing for the entirety of the spectrum to be captured at once. This study specifically tests a half-inch two-grating monolithic SHRS (½-in. 2g-mSHRS), which has a weight of <60 g and a size of 2.2 × 2.2 × 1.3 cm. To do this we excite a variety of organic liquids with a 532 nm neodymium-doped yttrium aluminum garnet (Nd:YAG) pulsed laser, using an excitation energy of 6.5 mJ/pulse and distance of 3 m in conjunction with an intensified charge-coupled device camera. This is the first time that the SHRS has been used for investigating polarized Raman spectra of liquids. We discuss and contrast the instrumental properties such as resolution, spectral range, étendue, and field of view with previously tested mSHRS to give context to the instrument's performance.
拉曼光谱法可通过光的非弹性散射对材料进行明确识别。这项技术在学术、科学和工业等社会各个方面有诸多用途。本文探讨了一种特定类型的拉曼光谱仪，即空间外差拉曼光谱仪（SHRSy），它是干涉光谱仪的一种变体。它利用迈克尔逊干涉仪，并用光栅取代镜子，将其从时域光谱仪转变为空间域光谱仪，从而能够一次性捕获整个光谱。本研究专门测试了一种半英寸双光栅单片式SHRS（½英寸2g - mSHRS），其重量小于60克，尺寸为2.2×2.2×1.3厘米。为此，我们使用能量为6.5毫焦/脉冲的532纳米掺钕钇铝石榴石（Nd:YAG）脉冲激光，在距离为3米的情况下激发多种有机液体，并结合增强型电荷耦合器件相机进行研究。这是首次将SHRS用于研究液体的偏振拉曼光谱。我们将该仪器的分辨率、光谱范围、 étendue和视场等仪器特性与之前测试过的mSHRS进行讨论和对比，以说明该仪器的性能情况。
