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

作者：Mizouri Arin; Deng L Z; Eardley Jack S; Nahler N Hendrik; Wrede Eckart; Carty David^*

来源：Physical Chemistry Chemical Physics, 2013, 15(45): 19575-19579.

DOI：10.1039/c3cp53394h

The absolute density of SD radicals in a supersonic jet has been measured down to (1.1 +/- 0.1) x 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) x 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) x 10(-9) cm(-1) Hz(-1/2).

• 出版日期2013