Abstract

The collision-induced absorption of oxygen in the 540–650-nm wavelength region has been measured at a pressure range from 0 to 730 Torr at T = 294 K. Pressure-dependent cross sections of the $X {}^3{\displaystyle {\sum }_g^{+}}$ + $X {}^3{\displaystyle {\sum }_g^{+}}$ → a ¹Δ_g(v = 0) + a ¹Δ_g(v = 1) and $X {}^3{\displaystyle {\sum }_g^{+}}$ + $X {}^3{\displaystyle {\sum }_g^{+}}$ → a ¹Δ_g(v = 0) + a ¹Δ_g(v = 0) transitions have been determined by means of cavity-ringdown spectroscopy. Contributions of the overlapping γ and δ bands of O₂ have been evaded, and Rayleigh extinction has been taken into account.

© 1999 Optical Society of America

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