HIGH-RESOLUTION VUV ABSORPTION-SPECTRUM OF N-2 C4'-SIGMA-1-(U+)]-X-SIGMA-1-(G+) BANDS

Absorption spectra of the c′4 1Σu+ ← X 1Σg+ Rydberg bands of N2 in the 885 to 995 Å region are photographed at high resolution by a 6.65-m vacuum spectrograph. Rotational analyses of the c′4(v) ← X(0) and c′4(v) ← X(1) bands with v = 1-4 are given, together with a preliminary discussion of the homogeneous perturbations c′4 1Σu+ × b′ 1Σu+. Some abnormal frequency shifts and distributions of rotational line intensities previously observed in emission bands having c′4 upper levels are attributed to the effects of perturbations rather than predissociations. © 1979.