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We use offset-frequency-free difference frequency generation comb sources and a Fourier transform spectrometer with comb-mode-width limited resolution to measure and analyze spectra of molecular species of atmospheric relevance: CH3I and CH2Br2 around 3000 cm-1, and 14N 162O around 1280 cm-1.

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We report a novel approach for identifying the 15N site-preference in N2O from a chemical reaction using continuous wave cavity ringdown spectroscopy and comb-based Fourier transform spectroscopy, with the aim to establish the currently lacking international N2O isotopomer standard.