Measurements of the Singly Ionized Oxygen Auroral Doublet Lines λ λ 7320,7330Å Using High Resolution Sky Spectra

Details Measurements of the Singly Ionized Oxygen Auroral Doublet Lines λ λ 7320,7330Å Using High Resolution Sky Spectra Measurements of the Singly Ionized Oxygen Auroral Doublet Lines λ λ 7320,7330Å Using High Resolution Sky Spectra

Dec 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003aas...203.3806h&link_type=abstract

American Astronomical Society Meeting 203, #38.06; Bulletin of the American Astronomical Society, Vol. 35, p.1261

Astronomy and Astrophysics

Astrophysics

Scientific paper

The wavelengths of the individual [O II] 2s22p3 2D5/2^o -- 2s22p3 2P1/2,3/2^o λ 7320Å and [O II] 2s22p3 2D3/2^o -- 2s22p3 2P1/2,3/2^o λ 7330Å 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 7320Å and 7330Å doublet splittings of 1.077±0.003Å and 1.080±0.003Å respectively, significantly larger than the often quoted and utilized value of 0.8Å from Moore (1949, Atomic Energy Levels, Vol 1), and in line with NIST (1.07Å) as well as more recent astrophysical observations of the lines in planetary nebulae including 1.07Å from DeRobertis, Osterbrock, & McKee (1985,ApJ,293,459) and 1.09Å from Barnett & McKeith (1988,MNRAS,234,241). Our results suggest, however, that adjustments of +0.124Å and +0.131Å should be made to current NIST wavelengths for the blue and red components of the 7320Å doublet respectively, while the wavelengths of the 7330Å doublet components are little changed from current NIST values. The observed intensity ratio of 7320Å/7330Å from these measurements agrees with the theoretical value calculated under conditions of thermally populated 2Po levels.
Supported by grants from NSF Aeronomy and NASA Office of Space Science.

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