Abstract
In this Letter, the counterintuitive and largely unknown Raman activity of oxygen atoms is evaluated for its capacity to determine absolute densities in gases with significant O-density. The study involves CO2 microwave plasma to generate a self-calibrating mixture and establish accurate cross sections for the P-3(2) <-> P-3(1) and P-3(2) <-> P-3(0) transitions. The approach requires conservation of stoichiometry, confirmed within experimental uncertainty by a 1D fluid model. The measurements yield sigma(J=2 -> 1) = 5.27 +/-(rand:0.17)(sys:0.53) x 10(-31) cm(2)/sr and sigma(J=2 -> 0) = 2.11 +/-(rand:0.06)(sys:0.21) x 10(-31) cm(2)/sr, and the detection limit is estimated to be 1 x 10(15) cm(-3) for systems without other scattering species. (C) 2021 Optical Society of America
Original language | English |
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Pages (from-to) | 2172-2175 |
Number of pages | 4 |
Journal | Optics Letters |
Volume | 46 |
Issue number | 9 |
DOIs | |
Publication status | Published - 1 May 2021 |
Keywords
- TEMPERATURE