光学精密工程2025，Vol.33Issue(7)：1031-1041,11.DOI:10.37188/OPE.20253307.1031
波长调制-直接吸收光谱法Rb同位素比测量
Isotope ratio measurement of Rb using wavelength modulation-direct absorption spectroscopy
摘要
Abstract
Rubidium isotope analysis provides critical insights into the origin and history of samples,with significant applications in geology,biomedicine,and forensic science.Wavelength modulation-direct ab-sorption spectroscopy(WM-DAS)offers advantages of high signal-to-noise ratio and calibration-free oper-ation,enabling rapid,high-sensitivity measurements of gaseous metal atom isotopic abundances.In this study,RbCl was used as the sample,and electrothermal reduction was employed to generate gaseous Rb atoms.The WM-DAS technique was integrated with threshold denoising to enhance signal quality.Ab-sorption profiles of Rb atomic D2 transitions were recorded using DAS,WM-DAS,and denoised WM-DAS methods,followed by Gaussian fitting.Signal-to-noise ratios were improved by factors of 1.40 and 1.84,respectively,with an additional enhancement of 1.48 times upon accounting for the hyperfine struc-ture of the D2 line.The temperature of gaseous Rb atoms was determined to be 439 K,corresponding to a saturated vapor pressure of 1.826 Pa.The isotope ratio of 85Rb to 87Rb was measured as 2.613±0.007,achieving a precision of 0.779%,superior to that obtained by DAS alone.The detection limit for ^85Rb was established at 0.23%,satisfying the requirements for rubidium ore analysis.The combination of WM-DAS with electrothermal reduction demonstrates high precision and robust interference resistance,render-ing this method highly suitable for field measurements and promising for isotope abundance analysis.关键词
波长调制-直接吸收光谱/Rb同位素/超精细结构/吸收率函数Key words
wavelength modulation-direct absorption spectroscopy/Rb isotope/hyperfine structure/absorptivity function分类
电子信息工程引用本文复制引用
徐积政,孟远,卢兴吉,黄俊,杨韬,赵强,寿欢欢,黄印博,曹振松..波长调制-直接吸收光谱法Rb同位素比测量[J].光学精密工程,2025,33(7):1031-1041,11.基金项目
先进激光技术安徽省实验室青年基金资助项目(No.AHL2022QN01) （No.AHL2022QN01）
中国科学院合肥研究院院长基金资助项目(No.YZJJ2024QN05) （No.YZJJ2024QN05）
中国科学院战略性先导科技专项(A类)(No.XDA17010104) （A类）
