Transition probability and line broadening for the b(1)Sigma(+)(g)(v=0)<- X-3 Sigma(-)(g)(v=0) band of the (OO)-O-16-O-18 isotopomer of oxygen

Spectral line parameters and the Einstein transition probability of the b(1 )Sigma(g)(+)(nu = 0) <-- X(3)Sigma(g)(-),(nu = 0) band (A band) of the (OO) -O-16-O-18 isotopomer of molecular oxygen were determined from high-resolut ion Fourier transform absorption spectra of pure oxygen at pressures betwee n 80 and 1000hPa. The spectra were recorded at room temperature and 198 K, and at absorption pathlengths between 64.75 and 144.7 m. The spectrometer r esolution varied from 0.0069 to 0.029 cm(-1). Line positions, integrated li ne intensities and pressure-broadening coefficients for broadening by O-16( 2), were retrieved using a least-squares line-fitting procedure. Though the line positions remained uncalibrated, improved spectroscopic constants for the upper state were determined ((B) over tilde(0) = 1.314031(14)cm(-1), ( D) over tilde(0), = 4.75(4) x 10(- 6) cm(-1)). The individual intensity dat a from all spectra were combined and averaged line intensities with an accu racy of better than 10% and pressure-broadening coefficients with errors of less than 25% were derived for most of the lines. The broadening coefficie nts were found to be approximately (76 +/- 4)% of the corresponding self-br oadening coefficients of the O-16(2), isotopomer. Combining the individual observed line intensities in an intensity analysis, the Einstein transition probability for the A band of (OO)-O-16-O-18 was determined to be 0.079 (3 ) s(-1) and is (12 +/- 4)% smaller than the corresponding value for the A b and of the main species. (C) 1999 Elsevier Science Ltd. All rights reserved .