Journal article
CO Rydberg series converging to the CO⁺ D and C states observed by VUV-fluorescence spectroscopy



Publication Details
Authors:
Ehresmann, A.; Machida, S.; Ukai, M.; Kameta, K.; Kitajima, M.; Kouchi, N.; Hatano, Y.; Ito, K.; Hayaishi, T.
Publication year:
1997
Journal:
Journal of Physics B: Atomic, Molecular and Optical Physics
Pages range:
1907-1926
Volume number:
30
ISSN:
0953-4075

Abstract
The undispersed and dispersed vacuum ultraviolet fluorescence (λfl = 105-200 nm) after neutral photodissociation excitation of CO has been measured as a function of the exciting-photon energy in the region between 18.5 and 36 eV. The target-gas pressure dependence of the fluorescence intensities for energies below 23 eV was observed to be linear. For exciting-photon energies above 23 eV photoelectron impact excitation of neutral CO from the ground to the CO(A LΠ) state causes a nonlinear pressure dependence of the undispersed fluorescence intensity. CO Rydberg states converging to the CO+ D and C states have been assigned on the basis of the recorded spectra. Previous assignments of the RC(3s,4s,3p,4p) and RD(3s,4s) Rydberg series could be supported and the identification of their vibrational levels have been considerably extended. Two new progressions (RD(5s,6s)) have been assigned.


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