Trace measurement of rubidium, cesium and potassium isotope with degenerate four-wave mixing method

CHENG Xue-mei; REN Zhao-yu; YIN Xun-li; FEI Kun; BAI Jin-tao

doi:10.3788/OPE.20132108.1923

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Trace measurement of rubidium, cesium and potassium isotope with degenerate four-wave mixing method

更新时间：2020-08-12

- Trace measurement of rubidium, cesium and potassium isotope with degenerate four-wave mixing method
- Optics and Precision Engineering Vol. 21, Issue 8, Pages: 1923-1928(2013)
- 作者机构：
  
  西北大学光子学与光子技术研究所暨光电技术与功能材料省部共建国家重点实验室培育基地，陕西西安 710069
- 作者简介：
- 基金信息：
- DOI：10.3788/OPE.20132108.1923
  CLC： O437;O657.319
- Received：28 March 2013，
  
  Revised：19 April 2013，
  
  Published Online：20 August 2013，
  
  Published：15 August 2013
- 稿件说明：
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程雪梅任兆玉尹逊莉费坤白晋涛. 简并四波混频用于铷、铯和钾同位素痕量测量[J]. 光学精密工程, 2013,21(8): 1923-1928

CHENG Xue-mei REN Zhao-yu YIN Xun-li FEI Kun BAI Jin-tao . Trace measurement of rubidium, cesium and potassium isotope with degenerate four-wave mixing method[J]. Editorial Office of Optics and Precision Engineering, 2013,21(8): 1923-1928
程雪梅任兆玉尹逊莉费坤白晋涛. 简并四波混频用于铷、铯和钾同位素痕量测量[J]. 光学精密工程, 2013,21(8): 1923-1928 DOI： 10.3788/OPE.20132108.1923.

CHENG Xue-mei REN Zhao-yu YIN Xun-li FEI Kun BAI Jin-tao . Trace measurement of rubidium, cesium and potassium isotope with degenerate four-wave mixing method[J]. Editorial Office of Optics and Precision Engineering, 2013,21(8): 1923-1928 DOI： 10.3788/OPE.20132108.1923.

摘要

考虑用质谱法进行同位素分析存在分辨率有限、检出限高、样品预处理过程复杂等缺陷，提出了采用简并四波混频（DFWM）光谱技术来测量和分析同位素。选择氯化物中的Rb、Cs和K的同位素作为测试样品，用石墨炉原子化器将化合物原子化为原子蒸汽。通过对Rb、Cs和K的同位素进行分析发现：DFWM 光谱技术的分辨率很高，能够清楚地分辨3种元素的同位素以及超精细能级跃迁；对RbCl样品中的Rb同位素的丰度比值进行了测量，得到的丰度比值为（2.6490.002)，精度优于传统质谱法的测量结果。此外，DFWM光谱技术测量Rb，Cs和K同位素的检出限分别为 5.4 fg/mL，0.63 pg/mL和0.09 fg/mL。实验结果表明，相对于质谱法，DFWM光谱技术的测量精度更高，检出限更低，在同位素分析中具有明显的优势。

Abstract

In consideration of the drawbacks of mass-spectrometry in isotope analysis

a spectroscopy based on Degenerate Four-wave Mixing (DFWM) was proposed to analyze atomic isotopes and to overcome these limitations

like limited resolution

higher detection limits and complex sample preprocessing. Rubidium (Rb)

cesium (Cs) and potassium (K) isotopes were selected as measured samples and an atomizer based on graphite oven was used to atomize these compounds into atomic steams. The analytic results show that the DFWM spectroscopy has a higher resolution and it can distinguish isotopes and hyperfine structures of the three elements clearly. The measured isotope abundance ratio of Rb isotope is (2.6490.002)

which is superior to the sensitivity of traditional mass spectroscopy. The detection limits of proposed method is as low as 5.4 fg/ml

0.63 pg/mL and 0.09 fg/mL for Rb

Cs and K isotopes

respectively. Obtained results demonstrate that the spectroscopy based on DFWM has a higher resolution

lower detection limit and is more suitable for the isotope analysis as compared with the origional mass spectrometry.

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references

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