The first reported use is described of optogalvanic detection to observe laser-induced, dipole–dipole pair absorption in discharges of barium and helium–barium. Fractional changes in steady-state discharge populations as small as one part in 105 that are due to the laser-induced collision are observed. In both experiments the absorption maxima occur at the predicted (R = ∞) wavelength and have a full width at half-maximum of approximately 15 cm−1.
© 1980 Optical Society of America
Original Manuscript: December 3, 1979
Published: March 1, 1980
J. C. White, R. R. Freeman, and P. F. Liao, "Observation of dipole–dipole pair absorption using optogalvanic detection," Opt. Lett. 5, 120-122 (1980)