title: Spectroscopic investigation of methylated amines by a cavity-ringdown-based spectrometer.
abstract: High-resolution absorption spectra of gas-phase monomethylamine (MMA, CH(3)NH(2)) and dimethylamine [DMA, (CH(3))(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(min)=1.55 x 10(-8) cm(-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 H(2)O, CO(2), and other absorbing gases in this range.
authors.affiliation: Institute for Quantum Electronics, ETH Zurich, Schafmattstrasse 16, Zurich, Switzerland.
authors.forename: Dilyan
authors.initials: D
authors.lastname: Marinov
authors.forename: Julien M
authors.initials: JM
authors.lastname: Rey
authors.forename: Michel G
authors.initials: MG
authors.lastname: Müller
authors.forename: Markus W
authors.initials: MW
authors.lastname: Sigrist
mesh_terms: D000588:Amines / Q000737:chemistry*; D001944:Breath Tests; D004867:Equipment Design; D045853:Exhalation; D005740:Gases; D006801:Humans; D007674:Kidney Diseases / Q000175:diagnosis; D008107:Liver Diseases / Q000175:diagnosis; D008744:Methylamines / Q000737:chemistry; D008745:Methylation; D013053:Spectrophotometry / Q000379:methods*; D019265:Spectroscopy, Near-Infrared / Q000379:methods
chemical_list: D000588:Amines; D005740:Gases; D008744:Methylamines