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  • Title: A frequency-modulated quantum-cascade laser for spectroscopy of CH4 and N2O isotopomers.
    Author: Gagliardi G, Borri S, Tamassia F, Capasso F, Gmachl C, Sivco DL, Baillargeon JN, Hutchinson AL, Cho AY.
    Journal: Isotopes Environ Health Stud; 2005 Dec; 41(4):313-21. PubMed ID: 16543187.
    Abstract:
    We report the development of a novel laser spectrometer for high-sensitivity detection of methane and nitrous oxide. The system relies on a quantum-cascade laser source emitting wavelength of around 8.06 microm, where strong fundamental absorption bands occur for the considered species and their isotopomers. The detection technique is based on audio-frequency and radio-frequency modulation of laser radiation. First experimental tests have been performed to estimate the achievable detection limits and the signal reproducibility levels in view of possible measurements of (13)C/(12)C, (18)O/(16)O, (17)O/(16)O and (15)N/(14)N isotope ratios.
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