We report the first known observation of Raman scattering by oxygen atoms. The 3P2 →3P1 and 3P2 →3P0 transitions in the electronic ground state that produced Raman shifts of 158 and 227 cm−1 were detected. These transitions were observed in a fuel-lean atmospheric H2 + O2 flame. By comparing the O electronic and O2 pure-rotational Raman-scattering intensities, we measured the polarized cross sections for the two lines to be 6 ± 1 × 10−31 and 4 ± 1 × 10−31 cm2/sr, respectively, with an excitation source at 532.1 nm. These cross sections are two to three times stronger than those predicted by a single-configuration single-excitation Coulomb approximation.
© 1981 Optical Society of America
Original Manuscript: August 27, 1980
Published: January 1, 1981
Cameron J. Dasch and J. H. Bechtel, "Spontaneous Raman scattering by ground-state oxygen atoms," Opt. Lett. 6, 36-38 (1981)