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Measurement of nitric oxide concentrations in flames by using electronic-resonance-enhanced coherent anti-Stokes Raman scattering

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Abstract

We have measured nitric oxide (NO) concentrations in flames by using electronic-resonance-enhanced coherent anti-Stokes Raman spectroscopy (ERE-CARS). Visible pump and Stokes beams were tuned to a Q-branch vibrational Raman resonance of NO. A UV probe beam was tuned into resonance with specific rotational transitions in the (v=1,v=0) vibrational band in the A2Σ+X2Π electronic transition, thus providing a substantial electronic-resonance enhancement of the resulting CARS signal. NO concentrations were measured at levels down to 50 parts in 106 in H2air flames at atmospheric pressure. NO was also detected in heavily sooting C2H2air flames at atmospheric pressure with minimal background interference.

© 2006 Optical Society of America

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