David Ellis (Atomic Physics)
Professor of Physics and Astronomy
Ph.D., 1964, Cornell University
Professor Ellis' research field is theoretical atomic structure and spectroscopy. His
work includes both general theory and specific calculations. Current efforts are
directed toward long-term improvements in computer programs for atomic structure
calculations, especially in regard to the treatment of electron
coalescence. Other general topics
include tensor analysis of quantum operators dealing with effects such as
polarization of emitted photons, correlated motion of atomic electrons, and the
effect of relativistic interactions on energy-level structures. Examples of specific calculations include transition
probabilities for spectra such as Be I, N II, Cl I, and highly-ionized members of
the Be and Si isoelectronic sequences. Many of these results have had
astronomical applications in the areas such as stellar and planetary atmospheres,
and the interstellar medium.Links to representative works:
Interaction of
symbolic states in atomic structure computations, R. Matulioniene, D. Ellis, and
C. Froese Fischer, Lithuanian Journal of Physics 48, 35-48 (2008).
Use of the Einstein-Brillouin-Keller action quantization, L.J. Curtis and D.G.
Ellis, Am. J. Phys. (2004).
Interaction of Correlated-variable with Configuration-state Basis Functions,
David G. Ellis, APS DAMOP, Williamsburg, Virginia (2002).
A Predictive Data-Based
Exposition of 5s5p Lifetimes in the Cd Isoelectronic
Sequence, L.J. Curtis, R.Matulioniene, D.G. Ellis, and C. Froese Fischer, Phys. Rev. A 62,
052513 (2000).
Electron correlations in multiconfiguration
atomic wavefunctions,
David G. Ellis, Phys. Rev. A 53, 3986 (1996)
Other selected research results:
Angular integration
using symbolic state expansions, C. Froese Fischer and D. Ellis, Lithuanian
J. Phys. 44, 121 (2004).
Lifetimes of Doubly-Excited 2p3l Levels in Singly Ionized B II, R.E. Irving,
M. Henderson, D.G. Ellis, L.J. Curtis, Y. Zou, R. Hellborg and I. Martinson,
Physica Scripta 57, 630 (1998)
Lifetimes of the 3p54s 3P1, 1P1 and 3p53d 3P1 levels in K II, M.Henderson,
L.J.Curtis, R. Matulioniene, D.G.Ellis and Y.Li, Phys. Rev. A 55, 2723
(1997)
Limitations on the precision of atomic meanlife measurements, L.J. Curtis,
R.T. Deck and D.G. Ellis, Phys. Lett. A 230, 330 (1997)
Data-based predictions of line strengths in alkali-metal-like
isoelectronic sequences, L.J.Curtis, D.G.Ellis, and I.Martinson,
Phys. Rev. A 51, 251 (1995)
Oscillator Strengths of Selected Resonance Transitions
in Neutral Sulfur, D.Beideck, S.Federman, R.M.Schectman,
and D.G.Ellis, Ap. J. 428, 393 (1994)
Accurate Oscillator Strengths for Interstellar
Ultraviolet Lines of Cl I, R.M.Schectman, S.R.Federman,
D.J.Beideck, and D.G.Ellis,
Astrophysical Journal 406, 735 (1993)
Calculation of Intercombination Line Strengths in N III,
APS DAMOP, Reno, NV, May 1993.
Ellis, D.G., Martinson, I., and Westerlind, M. 1994. Spin-induced autoionization of
quasibound levels in Be I. Physica Scripta 49:561-564.
Ellis, D. 1993. Ultraviolet transition probabilities in N II. Phys. Rev. A 47:161.
E-mail: David.Ellis@utoledo.edu
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