Faraday modulation spectrometry of nitric oxide addressing its electronic X^2Π−A^2Σ^+ band: II experiment
Year: 2010
Type: article
Abstract: A first demonstration of Faraday modulation spectrometry (FAMOS) of nitric oxide (NO) addressing its strong electronic X(2)Π(ν″ = 0) - A(2)Σ(+)(ν(') = 0) band is presented. The instrumentation was constructed around a fully diode-laser-based laser system producing mW powers of ultraviolet light targeting the overlapping Q(22)(21/2) and R(12)Q(21/2) transitions at ∼226.6 nm. The work verifies a new two-transition model of FAMOS addressing the electronic transitions in NO given in an accompanying work. Although the experimental instrumentation could address neither the parameter space of the theory nor the optimum conditions, the line shapes and the pressure dependence could be verified under low-field conditions. NO could be detected down to a partial pressure of 13 µTorr, roughly corresponding to 10 ppb·m for an atmospheric pressure sample, which demonstrates the feasibility of FAMOS for sensitive detection of NO addressing its strong electronic band.
Source: Applied Optics
DOI: 10.1364/ao.49.005614
Authors: Jie Shao, Lemthong Lathdavong, Jonas Westberg, Pawel Kluczynski, Stefan Lundqvist, Ove Axner
Institutions: Zhejiang Normal University, Umeå University, Siemens (Sweden)
Language: English
Subfield: Spectroscopy
Field: Chemistry
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W1972196198