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Displaying 176 - 200 of 251

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

Wavelengths and Oscillator Strengths for Space Astronomy

April 1, 1998
Author(s)
Craig J. Sansonetti, Joseph Reader
Over a period of more than a decade the Atomic Spectroscopy Group at NIST has carried out laboratory research to support the observing program of the Hubble Space Telescope (HST). Our Initial effort concerned the wavelength calibration of GHRS by means of
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