Physics
Scientific paper
May 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003aps..dmp.n3001h&link_type=abstract
American Physical Society, 34th Meeting of the Division of Atomic, Molecular and Optical Physics, May 20-24, 2003, Boulder, Colo
Physics
Scientific paper
On large aperture telescopes astronomers have deployed superbly calibrated high-resolution spectrographs with performance comparable with the best laboratory instrumentation. Spectra of the ``empty sky" (really the Earth's atmosphere) have provided the first precision spectroscopy of 25 vibrational levels in O_2(X,a,b) and redetermination of the wavelength of the potassium 4p ^2P_1/2 arrow 4s ^2S_1/2 line. The atomic nitrogen 2p^3 ^2DJ arrow ^4S_3/2 transitions near 519.8 and 520.0 nm have calculated radiative lifetimes of about 10^5 seconds (roughly 1 day). They never have been detected in the laboratory and only rarely in the atmosphere. Our first analysis moved the transition wavelengths by 0.002 nm relative to the older determination from combination differences. The sensitivity of the Keck ESI and HIRES spectrographs enables a precision determination of the relative Einstein coefficients. We will also present new calculations of the Einstein coefficients and review previous theoretical work and inferences from observations.
Cosby Philip C.
Froese Fischer Charlotte
Huestis David L.
Slanger Tom G.
Tachiev Georgio
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