Absolute density measurement of SD radicals in a supersonic jet at the quantum-noise-limit

The absolute density of SD radicals in a supersonic jet has been measured down to (1.1 ± 0.1) × 10(5) cm(-3) in a modestly specified apparatus that uses a cross-correlated combination of cavity ring-down and laser-induced fluorescence detection. Such a density corresponds to 215 ± 21 molecules in th...

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Bibliographic Details
Published in:Physical chemistry chemical physics : PCCP 2013-12, Vol.15 (45), p.19575-19579
Main Authors: MIZOURI, Arin, DENG, L. Z, EARDLEY, Jack S, NAHLER, N. Hendrik, WREDE, Eckart, CARTY, David
Format: Article
Language:English
Subjects:
Acquisitions
Aircraft
Chemistry
Density
Density measurement
Exact sciences and technology
Fluorescence
Free Radicals - chemistry
General and physical chemistry
Holes
Marketing
Nitrogen - chemistry
Physical chemistry
Quantum Theory
Radicals
Spectrometry, Fluorescence
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Summary:The absolute density of SD radicals in a supersonic jet has been measured down to (1.1 ± 0.1) × 10(5) cm(-3) in a modestly specified apparatus that uses a cross-correlated combination of cavity ring-down and laser-induced fluorescence detection. Such a density corresponds to 215 ± 21 molecules in the probe volume at any given time. The minimum detectable absorption coefficient was quantum-noise-limited and measured to be (7.9 ± 0.6) × 10(-11) cm(-1), in 200 s of acquisition time, corresponding to a noise-equivalent absorption sensitivity for the apparatus of (1.6 ± 0.1) × 10(-9) cm(-1) Hz(-1/2).
ISSN:1463-9076
1463-9084
DOI:10.1039/c3cp53394h