The investigation of stable isotopes finds applications in a vast array of fields. The measurement of isotopic ratios in natural environments such as oceans, atmosphere and geological samples assists in identification of sources and sinks of compounds. On the other hand, isotopic labeling of compounds helps to study the role of different species in chemical reactions. Certain isotopes show distinct effects in reactions owing to their non-zero nuclear spins and thus open up a new scope for applications. Such properties also allow the study of fundamental constants through precision spectroscopic techniques. In recent years, for precise measurements of isotopes, cavity enhanced absorption spectroscopy (CEAS) techniques have been used which are robust and can be used in field applications and even in harsh environments. CEAS has mostly been utilized for gas phase isotopic analysis of light non-metals but can also be applied to heavier elements and metals in combination with plasma generation technology. In this perspective, we have presented an overview of CEAS-based stable isotopic analysis with a focus on the isotopic analysis of light elements such as H, C, N, O and S and have provided an outlook for future research in such fields using CEAS based techniques.

中文翻译：

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稳定同位素分析的发展作用和腔增强光谱学作为一种有效工具的出现

稳定同位素的研究在许多领域都有应用。测量海洋、大气和地质样品等自然环境中的同位素比率有助于确定化合物的来源和汇。另一方面，化合物的同位素标记有助于研究不同物种在化学反应中的作用。某些同位素由于其非零核自旋在反应中表现出明显的影响，从而开辟了新的应用范围。这些特性还允许通过精密光谱技术研究基本常数。近年来，为了精确测量同位素，已使用腔增强吸收光谱 (CEAS) 技术，该技术非常可靠，可用于现场应用甚至恶劣环境。CEAS 主要用于轻非金属的气相同位素分析，但也可与等离子体发生技术结合应用于较重的元素和金属。从这个角度来看，我们概述了基于 CEAS 的稳定同位素分析，重点是 H、C、N、O 和 S 等轻元素的同位素分析，并为使用 CEAS 在这些领域的未来研究提供了展望基于技术。