  The wavelengths of the individual [O II] 2s22p3 2Do(5/2) - 2s22p3
2Po(1/2,3/2) 7320\AA and [O II] 2s22p3 2Do(3/2) - 2s22p3 2Po(1/2,3/2) 7330\AA
auroral doublet component lines have been measured directly in the nightglow
for the first time, from high resolution spectra obtained with the HIRES
spectrograph on the Keck I telescope at the W.M. Keck Observatory.
Specifically, we find 7320\AA and 7330\AA doublet splittings of
1.077$\pm$0.003\AA and 1.080$\pm$0.003\AA respectively, with the former
significantly larger than the often quoted and utilized value of 0.8\AA from
Moore (1949, Atomic Energy Levels, Vol 1), and in line with NIST (1.07\AA) as
well as more recent astrophysical observations of the lines in planetary
nebulae including 1.07\AA from DeRobertis, Osterbrock, & McKee
(1985,ApJ,293,459) and 1.09\AA from Barnett & McKeith (1988,MNRAS,234,241). Our
results suggest, however, that adjustments of +0.124\AA and +0.131\AA should be
made to current NIST wavelengths for the blue and red components of the 7320\AA
doublet respectively, while the wavelengths of the 7330\AA doublet components
are little changed from current NIST values. The observed intensity ratio of
7320\AA/7330\AA from these measurements agrees with the theoretical value
calculated under conditions of thermally populated 2Po levels.

Astrophysics