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Displaying 76 - 100 of 126

The Bismuth Abundance in the HgMn Stars chi) Lupi and HR7775 and Improved Atomic Data for Selected Transitions of Bi I, Bi II, and Bi III

April 1, 2001
Author(s)
G Wahlgren, T Brage, J C. Brandt, J Fleming, S Johansson, D S. Leckrone, C R. Proffitt, Joseph Reader, Craig J. Sansonetti
High resolution spectra of the chemically peculiar HgMn type stars Χ Lupi and HR7775 obtained with the Hubble Space Telescope/Goddard High Resolution Spectrograph are investigated for their abundance of bismuth. HR7775, previously known from International

Spectrum and Energy Levels of Singly-Ionized Mercury (Hg II)

March 1, 2001
Author(s)
Craig J. Sansonetti, Joseph Reader
The spectrum of singly-ionized mercury (Hg II) has been observed from 500 to 9880 with sliding sparks and pulsed-RF discharges on 10.7-m grating spectrographs in vacuum and air. About 500 lines have been classified as transitions between 114 energy levels

Infrared Spectra of Ne, Kr, and Xe

January 1, 2001
Author(s)
Craig J. Sansonetti, M M. Blackwell, Edward B. Saloman
New observations of the spectra of neutral Ne, Kr, and Xe in the region 0.7 to 5.0 m with the 2-m NIST FTS provide precise new wavelengths and resolve questions concerning lines that were previously multiply classified.

Image Plates for Registration of Far-Ultraviolet Spectra

February 1, 2000
Author(s)
Joseph Reader, Craig J. Sansonetti, R Deslattes
We have tested an autoradiographic photostimulable phosphor image storage plate as a medium for recording spectra in the wavelength region from 50 to 550 and have compared the results with spectra obtained using conventional photographic emulsions. The

New NIST Atomic Spectra Database

December 1, 1999
Author(s)
Daniel E. Kelleher, Peter J. Mohr, William C. Martin, Wolfgang L. Wiese, J Sugar, Jeffrey R. Fuhr, Karen J. Olsen, Arlene Musgrove, Joseph Reader, Craig J. Sansonetti, G R. Dalton

Precision Spectroscopy in He as a Test of QED

December 1, 1999
Author(s)
S Bergeson, A Balakrishnan, K G. Baldwin, Thomas B. Lucatorto, J P. Marangos, T J. McIlrath, Thomas R. O'Brian, S L. Rolston, Craig J. Sansonetti, J Wen, N Westbrook, C H. Cheng, E E. Eyler
High resolution laser-based measurements of energy levels have spurred the development and refinement of quantum electrodynamic calculations. We have extended very high resolution laser spectroscopy techniques into the vacuum ultraviolet wavelength region

Modern Wavelength Standards in the Ultraviolet and Vacuum Ultraviolet

July 1, 1999
Author(s)
Joseph Reader, Craig J. Sansonetti
In recent work at the National Institute of Standards and Technology the Atomic Spectroscopy Group has characterized several sources of wavelength standards useful for remote sensing applications. At low resolution, mercury pencil-type lamps are convenient

Precision Spectroscopy in He as a Test of QED

January 1, 1999
Author(s)
S D. Bergeson, A Balakrishnan, G H. Baldwin, Thomas B. Lucatorto, J P. Marangos, T J. McIlrath, Thomas R. O'Brian, S L. Rolston, Craig J. Sansonetti, J Wen, N Westbrook, C H. Cheng, E E. Eyler

The New NIST Atomic Spectra Database (1999)

January 1, 1999
Author(s)
Daniel E. Kelleher, Peter J. Mohr, William C. Martin, Wolfgang L. Wiese, J Sugar, Jeffrey R. Fuhr, Karen J. Olsen, Arlene Musgrove, Joseph Reader, Craig J. Sansonetti

NIST Atomic Spectra Database (1998)

August 13, 1998
Author(s)
Daniel E. Kelleher, William C. Martin, Wolfgang L. Wiese, J Sugar, Craig J. Sansonetti, Jeffrey R. Fuhr, Joseph Reader, Arlene Musgrove, Karen J. Olsen, Peter J. Mohr, G R. Dalton

Critical Compilation of Atomic Wavelength and Energy Level Data

April 1, 1998
Author(s)
William C. Martin, J Sugar, Arlene Musgrove, Craig J. Sansonetti, Jean E. Sansonetti, Edward B. Saloman, V I. Azarov, Alexander Kramida, A N. Ryabtsev, T Shirai
The Atomic Energy Levels Data Center at the National Institute of Standards and Technology (NIST), in cooperation with other laboratories indicated above, is critically evaluating and compiling energy levels, wavelengths, and energy level classifications

Measurement of the He Ground State Lamb Shift Via the Two-Photon 1 1 S - 2 1 S transition

April 1, 1998
Author(s)
S Bergeson, A Balakrishnan, K G. Baldwin, Thomas B. Lucatorto, J P. Marangos, T J. McIlrath, Thomas R. O'Brian, S L. Rolston, J Wen, N Westbrook, C H. Cheng, E E. Eyler, Craig J. Sansonetti
We have extended two-photon Doppler-free spectroscopy to the vacuum ultraviolet spectral region to accurately measure the He 1 1S - 2 1S transition at 120 nm. Our result is 4 984 872 315[48] MHz. This yields a ground state Lamb shift of 41104[48] MHz, in
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