Fourier transform emission spectroscopy of the second negative (A2Piu - X2Pig) system of the O+2 ion

摘要

The second negative (A2#x3A0;u- X2#x3A0;g) system of the O2+ion was produced in a tungsten hollow cathode discharge tube using oxygen in neon. This spectrum was recorded with the McMath-Pierce Fourier transform spectrometer of the National Solar Observatory. A total of ten bands with #x3BD;#x2033; = 0 and 1 and #x3BD;#x2032; = 6 to 12 in the range 15 945-30 218 cm-1were observed and rotationally analysed. The line positions of all these bands, along with those of a few additional bands available in the literature, were combined in a global least-squares fit. Many molecular parameters for the various vibrational levels and the equilibrium molecular constants for the X and A states were estimated. RKR potential energy curves were constructed and Franck-Condon factors were calculated for the vibrational bands of the second negative (A-X) system. Some additional information obtained from threshold photoelectron spectroscopy was used to extend the X2#x3A0;gpotential curve up to #x3BD; = 24.