TRANSITION PROBABILITIES FOR O2 SCHUMANN-RUNGE BANDS FROM SHOCK-TUBE EMISSION STUDIES

Spectral emission measurements for several 20 Å bandpasses between 3370 Å and 6000 Å have been made for shock-heated oxygen in the 3-in. conventional shock tube. The SACHA Code(1) has been used to compute the integrated emissivity in these bandpasses due to the observed O2(SR) lines for the reflected-shock conditions of 5900°K-8500°K at 0·33 ρ{variant}0. Separate calculations have been made using the Franck-Condon arrays of Nicholls(2) based on the Morse potential function and an array based on the Rydberg-Klein-Rees potential.(3) SACHA-experimental comparisons yield an f{hook}-value of 0·040 for the O2 Schumann-Runge electronic transition which is in good agreement with the f{hook}-values of 0·048 and 0·034 obtained respectively by Treanor and Wurster(4) and Krindach et al.,(5) from spectral absorption studies of the incident shock. The RKR(3) Franck-Condon array describes the observed spectral distribution of the O2(SR) lines somewhat better than the RWN array.(2). © 1969.