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Isotopic trace analysis of water vapor with multipass cavity Raman scattering
Jaspreet Singh1, Andreas Muller1
1Department of Physics, University of South Florida, Tampa, Florida, 33620, USA. mullera@usf.edu.
The Analyst
|September 28, 2021
Summary
Cavity-enhanced Raman spectroscopy offers a simple method for isotopic water analysis. This technique accurately measures deuterium-hydrogen ratios in water samples, even at trace levels.
Area of Science:
- Spectroscopy
- Analytical Chemistry
- Environmental Science
Background:
- Isotopic analysis of water is crucial for various scientific disciplines.
- Traditional methods can be complex and expensive.
- Developing simpler, cost-effective analytical techniques is essential.
Purpose of the Study:
- To investigate cavity-enhanced spontaneous Raman scattering (CESRS) for isotopic water analysis.
- To demonstrate the feasibility of CESRS for measuring deuterium-hydrogen ratios.
- To assess the technique's performance at trace concentration levels.
Main Methods:
- Utilized a multimode blue laser diode with a feedback-generating multipass cavity.
- Achieved 100-fold Raman enhancement with a pump linewidth of 3.5 cm⁻¹.
- Probed water samples with varying deuterium-hydrogen concentration ratios.
Main Results:
- Successfully measured deuterium-hydrogen concentration ratios from 157 ppm down to 8 ppm.
- Detected trace amounts of 1H2H16O at concentrations near 100 parts per billion.
- Measurements were performed at atmospheric pressure using an uncooled camera with short exposure times.
Conclusions:
- Cavity-enhanced spontaneous Raman scattering is a viable method for simple and inexpensive isotopic water analysis.
- The technique demonstrates high sensitivity for detecting trace deuterium concentrations.
- CESRS offers a promising alternative for routine isotopic water analysis.
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