  We report the detection of 11 Rydberg bands of CO in FUSE spectra of the
sight line toward HD203374A. Eight of these electronic bands are seen in the
interstellar medium for the first time. Our simultaneous fit of five
non-Rydberg A-X bands together with the strongest Rydberg band of CO, C-X
(0-0), yields a 4-component cloud structure toward the stellar target. With
this model we synthesize the other Rydberg bands in order to derive their
oscillator strengths. We find that the strength of some bands was
underestimated in previously published results from laboratory measurements.
The implication is important for theoretical calculations of the abundance of
interstellar CO, because its dissociation and self shielding depend on
oscillator strengths for these bands.
