Abstract

High-resolution absorption spectra of gas-phase monomethylamine (MMA, CH3NH2) and dimethylamine [DMA, (CH3)2NH] in the region of the first overtone of the NH stretch vibration are reported. Measurements were performed with a near-infrared laser spectrometer based on the cavity-ringdown (CRD) detection technique. The minimum detectable absorption coefficient for the CRD detection setup is αmin=1.55×108cm1 (for SNR = 1). This corresponds to detection limits of 350 parts in 109 (ppb) for MMA and 1.6 parts in 106 (ppm) for DMA in synthetic gas mixtures under interference-free conditions, or 10 ppm and 60 ppm for MMA and DMA, respectively, in the case of gas mixtures such as exhaled human breath containing H 2O, CO2, and other absorbing gases in this range.

© 2007 Optical Society of America

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