Physics – Atomic Physics
Scientific paper
Jan 2012
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012aas...21944302n&link_type=abstract
American Astronomical Society, AAS Meeting #219, #443.02
Physics
Atomic Physics
Scientific paper
The Atomic Spectroscopy Group at the National Institute of Standards and Technology (NIST) has equipment to measure atomic wavelengths and oscillator strengths of astrophysical interest over a wide spectral range. Our 2-m Fourier transform (FT) spectrometer covers wavelengths from 230 nm to 5500 nm at a resolving power of over a million. It has been used to measure calibration data for ground-based astronomical spectrographs, including infrared atlases of Th/Ar and U/Ne hollow cathode lamps and measurements of iodine absorption cells that calibrate many of the spectrographs used for exoplanet searches. Our ultraviolet FT spectrometer covers the range from 140 nm to 900 nm with a resolving power of over a million at 200 nm. Below 140 nm, our 10.7 m normal incidence vacuum spectrograph has been used to provide calibration data for three spectrographs on the Hubble Space Telescope (GHRS, STIS and COS). Although originally designed for use with photographic plates, we have begun using this instrument with phosphor image plates as detectors. These provide a linear intensity response throughout the vacuum ultraviolet, enabling us to measure branching ratios in Fe II and the change in spectral line intensities of Pt/Ne hollow cathode lamps as they age. Data from all three instruments are currently being analyzed to obtain comprehensive descriptions of the spectra of Fe II and Cr II covering wavelengths from 90 nm to 5500 nm.
Much of this work has been partly funded by NASA, most recently under agreement NNH11AQ551 to analyze spectra of iron-group elements. Such support is crucial to the continuation of this work at NIST, much of which is of little interest in basic atomic physics but is vital for the interpretation of astrophysical spectra. We are seeking collaborations with astronomers who can assist us in determining future research directions.
Nave Gillian
Redman Stephen L.
Sansonetti Craig J.
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