Abstract

High-resolution absorption spectra of gas-phase monomethylamine (MMA, ${\text{CH}}_{\text{3}}{\text{NH}}_{\text{2}}$) and dimethylamine [DMA, ${\left({\text{CH}}_{\text{3}}\right)}_2$NH] 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 ${\alpha }_{\text{min}}=1.55\times {10}^{-8}{\text{cm}}^{-\text{1}}$ (for SNR = 1). This corresponds to detection limits of 350 parts in ${10}^9$ (ppb) for MMA and 1.6 parts in ${10}^6$ (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 ${\text{H 2}}_{}\text{O}$, ${\text{CO}}_{\text{2}}$, and other absorbing gases in this range.

© 2007 Optical Society of America

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