Answers are grounded in this paper and cite their sources.
A laser absorption spectrometer is described which uses a tunable diode laser and a 1-m multipass White cell to detect NO(2) in air with a sensitivity of better than 100 ppt. The modulation techniques employed to achieve this sensitivity are described in detail, and the noise mechanisms, which currently limit the detectable absorption coefficients to greater, similar 10(-7) m(-1), are examined.
No takes yet. Share an insight, caveat, or question.
Reid et al. (1980) studied this question.
Synapse has enriched 10 related papers. Consider them for comparative context: