期刊
ANALYST
卷 142, 期 13, 页码 2354-2362出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c7an00223h
关键词
-
资金
- DOE/NNSA Office of Nonproliferation and Verification Research and Development [NA-22]
- Battelle Memorial Institute [DE-AC05-76RL01830]
A swept-ECQCL is used for broadband IR spectroscopy of isotopic mixtures of CH3OH, CH3OD, CH3CH2OH, and CH3CH2OD in a static gas cell over a wavelength range of 9.5 to 10.4 mu m. A weighted least squares fitting approach with quantitative library spectra illustrates that significant spectral congestion does not negatively impact the ability for in situ quantification of large isotopic species in a mixture. The noise equivalent concentrations for CH3OH, CH3OD, CH3CH2OH, and CH3CH2OD are 19 ppbv m, 28 ppbv m, 450 ppbv m, and 350 ppbv m respectively for a 50 seconds integration time. Based on the observed NECs, isotopic precisions of 0.07% and 0.79% for a 50 s integration time are calculated for measurements of the [MeOD]/[MeOH] and [EtOD]/[EtOH] isotope ratios, respectively, for the species concentrations in the gas cell.
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