High-precision determination of oxygen-Kαtransition energy excludes incongruent motion of interstellar oxygen,Physical Review Letters

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High-precision determination of oxygen-Kαtransition energy excludes incongruent motion of interstellar oxygen
Physical Review Letters ( IF 8.1 ) Pub Date :
M. A. Leutenegger et al.

We demonstrate a widely applicable technique to absolutely calibrate the energy scale of x-ray spectra with experimentally well-known and accurately calculable transitions of highly charged ions, allowing us to measure the K-shell Rydberg spectrum of molecular O

_{2}

with 8,meV-uncertainty. We reveal a systematic $

450 m e V s h i f t f r o m p r e v i o u s l i t e r a t u r e v a l u e s, a n d s e t t l e a n e x t r a o r d i n a r y d i s c r e p a n c y b e t w e e n a s t r o p h y s i c a l a n d l a b o r a t o r y m e a s u r e m e n t s o f n e u t r a l a t o m i c o x y g e n, t h e l a t t e r b e i n g c a l i b r a t e d a g a i n s t t h e a f o r e m e n t i o n e d O

_2$ literature values. Because of the widespread use of such, now deprecated, references, our method impacts on many branches of x-ray absorption spectroscopy. Moreover, it potentially reduces absolute uncertainties there to below the meV level.

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