title: Detection of nitric oxide in air with a 5.2 μm distributed-feedback quantum cascade laser using quartz-enhanced photoacoustic spectroscopy.
abstract: We demonstrate the detection of nitric oxide in both air and nitrogen atmospheres with a 5.2 μm distributed-feedback quantum cascade laser in a quartz-enhanced photoacoustic spectroscopy system. The photoacoustic signal generated by nitric oxide is shown to be several times larger in air than in nitrogen due to the faster vibrational-translational energy relaxation process induced by the presence of oxygen. A sensitivity of 2.5 parts-per-million by volume is achieved in air at atmospheric pressure.
authors.affiliation: Corning Incorporated, Corning, NY 14831, USA. grays@corning.com
authors.forename: Stuart
authors.initials: S
authors.lastname: Gray
authors.forename: Anping
authors.initials: A
authors.lastname: Liu
authors.forename: Feng
authors.initials: F
authors.lastname: Xie
authors.forename: Chung-en
authors.initials: CE
authors.lastname: Zah