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High-sensitivity detection of NO in a flame using a tunable ArF laser
Optics Letters
|September 12, 2009
Summary
This study demonstrates sensitive detection of nitric oxide (NO) in flames using a tunable ArF laser. The laser-induced fluorescence technique achieved a detection limit of 1 part per million, with potential for even greater sensitivity.
Area of Science:
- Chemical Physics
- Spectroscopy
- Combustion Science
Background:
- Nitric oxide (NO) is a critical species in combustion processes and atmospheric chemistry.
- Accurate measurement of NO at natural abundance is essential for understanding these phenomena.
- Laser-induced fluorescence (LIF) offers a sensitive method for species detection in reactive environments.
Purpose of the Study:
- To develop and validate a tunable, narrow-band ArF laser-based LIF system for NO detection in flames.
- To establish the detection limits of the developed system under flame conditions.
- To explore the potential for enhanced sensitivity in trace NO detection.
Main Methods:
- Utilized a tunable, narrow-band ArF excimer laser for excitation of NO.
- Employed laser-induced fluorescence (LIF) spectroscopy.
- Observed P and R branches of the D(2)Sigma(upsilon'=0)←X(2)Pi(upsilon''=0,1/2,3/2) transition.
- Used a monochromator-based, dispersed-fluorescence detection system.
- Performed experiments in both flame and cell environments.
Main Results:
- Achieved a single-shot detection limit of 1 part in 10^6 (1 ppm) for NO in a flame experiment.
- Probed rotational states of NO from J'' = 19.5 to J'' = 44.5.
- Demonstrated the capability of the narrow-band laser to suppress interfering fluorescence.
- Observed the NO B(2)Pi(upsilon'=7)←X(2)Pi(upsilon''=0) transition in a cell but not in the flame.
Conclusions:
- The tunable ArF laser-LIF system is effective for sensitive NO detection in flames.
- The system shows potential for achieving detection limits at or below 1 part in 10^9 with undispersed fluorescence detection.
- Further investigation into specific NO transitions may be beneficial for trace detection applications.
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