Online monitoring of biogenic nitric oxide with a QC laser-based Faraday modulation technique
- First Online:
- Cite this article as:
- Ganser, H., Horstjann, M., Suschek, C. et al. Appl. Phys. B (2004) 78: 513. doi:10.1007/s00340-003-1379-0
- 69 Downloads
Online sensing of nitric oxide traces based on a cw quantum cascade laser, operating near 5.2 μm, is reported. We utilized a Faraday modulation technique which provides unique selectivity since it exploits the magnetic moment of nitric oxide (NO) molecules. The minimum detectable NO concentration was found to be 4 ppb (sampling time: 10 s). Continuous monitoring of the NO release from nitrite solutions and human sweat samples is described. Detectable NO release rates are down to 10 pmol/s. We compare NO generation induced by a chemical, and by exposure to ultra-violet radiation.