Cavity ring-down measurement of the O-2-O-2 collision-induced absorption resonance at 477 nm at sub-atmospheric pressures

a(1) Delta(g)(upsilon = 0) + b(1)Sigma(g)(+)(upsilon = 0) in the wavelength range 467-490 nm has been investigated by means of the laser-based cavity-ring-down technique at pressures between 0 and 1000 hPa and at T = 294 K. Pressure and wavelength dependent cross sections have been determined leading to a band-integrated value of (2.18 +/- 0.04) x 10(-43) cm(4) molecule(-2). Special care has been given to the wings of the resonance profile and the Rayleigh extinction was taken into account. (C) 2003 Elsevier Science Ltd. All rights reserved