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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Editor: Joseph N. Mait
  • Vol. 49, Iss. 29 — Oct. 10, 2010
  • pp: 5614–5625

Faraday modulation spectrometry of nitric oxide addressing its electronic X 2 Π A 2 Σ + band: II. experiment

Jie Shao, Lemthong Lathdavong, Jonas Westberg, Pawel Kluczynski, Stefan Lundqvist, and Ove Axner  »View Author Affiliations


Applied Optics, Vol. 49, Issue 29, pp. 5614-5625 (2010)
http://dx.doi.org/10.1364/AO.49.005614


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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.

© 2010 Optical Society of America

OCIS Codes
(020.0020) Atomic and molecular physics : Atomic and molecular physics
(020.7490) Atomic and molecular physics : Zeeman effect
(120.0280) Instrumentation, measurement, and metrology : Remote sensing and sensors
(300.6260) Spectroscopy : Spectroscopy, diode lasers
(300.6540) Spectroscopy : Spectroscopy, ultraviolet
(010.0280) Atmospheric and oceanic optics : Remote sensing and sensors

ToC Category:
Atmospheric and Oceanic Optics

History
Original Manuscript: May 27, 2010
Manuscript Accepted: August 12, 2010
Published: October 8, 2010

Citation
Jie Shao, Lemthong Lathdavong, Jonas Westberg, Pawel Kluczynski, Stefan Lundqvist, and Ove Axner, "Faraday modulation spectrometry of nitric oxide addressing its electronic X2Π−A2Σ+ band: II. experiment," Appl. Opt. 49, 5614-5625 (2010)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-49-29-5614


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  74. The FAMOS technique also has appeared under a few other names throughout the years, e.g., magnetic rotation spectroscopy (MRS) , Zeeman modulation spectroscopy (ZMS) , and, most recently, Faraday rotation spectroscopy (FRS) . Originally, however, MRS referred to a technique in which a static field was used to study both magnetic circular birefringence and dichroism .
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  84. N is the quantum number that corresponds to the rotational energy of a state that lacks orbital angular momentum (i.e., Λ=0) and adheres to Hund’s case (b), given by BN(N+1) and associated with the operator (J−S)2, where J and S are the operators for the total angular momentum and the electronic spin, respectively. Although not formally correct, N can, for convenience, be associated with the rotation of the nuclei.
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  87. Here,we have utilized the same nomenclature as in Ref. , i.e., a tilde sign indicates that the entity is given in units of inverse centimeters, whereas an overbar shows that the entity is dimensionless. The superscript D indicates that it is normalized with respect to δν˜D/ln⁡2.
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