Rapid High-Sensitivity Analysis of Methane Clumped Isotopes (Δ¹³CH₃D and Δ¹²CH₂D₂) Using Mid-Infrared Laser Spectroscopy.

ABSTRACT: Mid-infrared laser absorption spectroscopy enables rapid and nondestructive analysis of methane clumped isotopes. However, current analytical methods require a sample size of 20 mL STP (0.82 mmol) of pure CH₄ gas, which significantly limits its application to natural samples. To enhance the performance of spectroscopic measurement of methane clumped isotopes, we established a laser spectroscopic platform with newly selected spectral windows for clumped isotope analysis: 1076.97 cm^-1 for ¹²CH₂D₂ and 1163.47 cm^-1 for ¹³CH₃D, and a custom-built gas inlet system. These spectral windows were identified through an extensive spectral survey on newly recorded high-resolution Fourier transform infrared (FTIR) sp

SUBMITTER: Zhang N 

PROVIDER: S-EPMC11755397 | biostudies-literature | 2025 Jan

REPOSITORIES: biostudies-literature