Final-state selectively observed autoionization and predissociation processes in NO for E-ex=16.9-19.6 eV

NO dispersed VUV-fluorescence excitation (lambda (fl) = 134-152 mn) was mea sured as a function of the exciting-photon energy,between 16.9 and 19.6 eV using monochromatized synchrotron radiation with a bandwidth of 6.5 meV. A two-dimensional fluorescence excitation spectrum was obtained, where the in tensity is plotted as a function of both fluorescence wavelength and exciti ng-photon energy. Fluorescence from NO+ A (1)Pi (v = 0, 1, 2) vibronic leve ls and fluorescence from excited dissociation fragments N I (3s P-2(J)) was observed simultaneously. Fragment state selective predissociation and auto ionization of the NO: (c (3)Pi) 3p pi (v = 0) and (C (3)Pi) 3p sigma (v = 0 ) Rydberg states were observed simultaneously.