Calculations and First Quantitative Laboratory Measurements of O_{2} A-Band Electric Quadrupole Line Intensities and Positions

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Mini-Symposium: Cavity Enhanced Spectroscopy

Scientific paper

Frequency-stabilized cavity ring-down spectroscopy (FS-CRDS) was utilized to make quantitative laboratory-based measurements of electric quadrupole transitions within the ^{16}O_{2} A-band. We report the first observations of eight extremely weak (line intensities ranging from 3x10^{-30} to 2x10^{-29} cm molec.^{-1}) transitions within the NO, PO, and RS branches. New theoretical calculations of line intensities and positions are also presented and compared to these measurements.
Measured spectrum (symbols) and Voigt fit (line) of electric quadrupole line in the wings of the PQ(11) hot band, magnetic dipole line. Peak signal-to-noise ratio on electric quadrupole line is 16:1.
Fit-derived peak areas vs. number density for the NO branch electric quadrupole lines.

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