Fourier transform spectrometer remote sensing of O _2 A-band electric quadrupole transitions

摘要

We observed electric quadrupole transitions in the O _2 A-band, b ~1σ _g +←X ~3σ _g -(0,0), in high solar zenith angle atmospheric spectra recorded with the high-resolution solar-viewing Fourier transform spectrometer at Park Falls, WI. We identified 12 ΔN=±3 transitions for the first time, including the first detection of ~NO-branch transitions and extended the ~TS-branch observations of Brault [J Mol Spectrosc 1980;80:384-8] up to N″=23. Additionally, we observed six electric quadrupole transitions of the ΔN=-1 ~PO-branch. These observations demonstrate the excellent sensitivity and long-term stability of the new generation of solar-viewing Fourier transform spectrometers.