Doubly Excited States Comparisons of theory and experiments

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Doubly Excited States Comparisons of theory and
experiments

• Bin Lin1,4, Gordon Berry1, Tomohiro Shibata1,
  Henri-Pierre Garnir2, Thierry Bastin2 and J.
  Désesquelles3 , Lanlan Lin5
• 1. Department of Physics, University of Notre
  Dame, Notre Dame, IN 46556
• 2. I.P.N.A.S., University of Liége, Belgium
• 3. Lab. Spectrometrie Ionique et Moleculaire,
  University of Lyon, Villeurbanne, France.
• 4. Beijing Institute of Applied Physics and
  Computational Mathematics, Beijing 100088, China
• 5. Institute of Physics, Beijing 100080, China

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Lining up the electron spins. or Exciting the
inner shell electrons 3-electrons (lithium
sequence) ? quartets also sodium and other
alkali sequences 4-electrons (beryllium
sequence) -gt quintets 5-electrons (boron
sequence) -gt sextets An important early
paper Example of the decay of the lowest
(METASTABLE) state of these high-spin
states Decay of 4P5/2 Autoionizing States of
Ions in the Li Isoelectronic Sequence,
K.T. Cheng, C.P. Lin, and W.R. Johnson, Phys.
Letts. 48A, 437 (1974).
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Why are we interested in sextet states?
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Doubly excited sextet states in boron-like ions

• Five electrons with aligned spins
• well above several ionization levels
• metastable
• t10-6 -10-9s.

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Fast beam-foil spectroscopy at the 2 MeV Van de
Graaff accelerator at the University of Liège
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The 1s2s2p23d 6FJ-1s2p33d 6DJ' transitions in the
beam-foil spectra of oxygen, recorded at the
different energies. The beam energies and
spectrometer slit widths are shown.
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The doubly excited sextet levels in O IV
The transition wavelengths are in Angströms.
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Grotrian diagram of doubly excited sextet levels
1s2p2nln'l' 6L in O IV. The units of wavelengths
are Å.
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Decay curves of O IV sextets
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Just a brief selection.(from Sally)
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(No Transcript)
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Walters Academic descent from Joseph Louis
Lagrange (Walter as a Lagrangian) Walter R.
Johnson Ph.D. Michigan 1957, now at the
University of Notre Dame his advisor was Otto
LaPorte born 23 July 1902 Mainz, Germany
died Ann Arbor, Michigan USA Ph.D.
University of Munich 1924 Laportes advisor
was Arnold Johannes Wilhelm Sommerfeld born 5
December 1868 Konigsberg, Prussia, died 26 April
1951, Munich, Germany Sommerfelds advisors
were 1. Carl Lewis Ferdinand von Lindemann b. 12
October1852 in Hannover, Hanover (now Germany),
died 6 March 1939. His Ph.D. thesis (Erlangen),
was supervised by Felix Klein. 2. Felix
Christian Klein b. 1849 in Düsseldorf, Prussia
(now Germany) (Felix Klein seems to have been
the sole habilitation student of both of his
advisors) Kleins advisors were 1. Julius
Plücker 1801-1868 Habilitation in
1823 Universität Marburg Advisor Christian
Gerling Ph.D. Göttingen 1812 (see below for
his heritage - Carl Gauss, Johann Pfaff, Abraham
Kästner, Christian Hausen, Johann
Wichmannshaussen, Otto Mencke) 2. Rudolph Otto
Sigismund Lipschitz 1832-1903 Habilitation in
1853 from Universität Berlin Advisors Martin
Ohm and Gustav Dirichlet
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Martin Ohm 1792-1872 Habilitation in 1811 from
Friedrich-Alexander-Universität,
Erlangen- Nürnberg brother of Georg Simon Ohm ,
who discovered "Ohm's Law". Advisor Karl
Christian von Langsdorf (may have been
self-taught) .Johann Peter Gustav Lejeune
Dirichlet 1805-1859 Habilitation in 1827 from
Rheinische Friedrich-Wilhelms-Universität, Bonn
Advisors Simeon Poisson and Jean-Baptiste
Fourier .Simeon Denis Poisson b. 21 June
1781- 25 Pithiviers died April1840 Sceaux, Paris
graduated in 1802 from Ecole Polytechnique,
Paris Advisor Joseph Louis Lagrange
.Jean-Baptiste Joseph Fourier 1768-1830 trained
at Ecole Normale, Paris Advisor Joseph Louis
Lagrange Joseph Louis Lagrange (Giuseppe
Lodovico Lagrangia) b. 25 January1736 Turin,
Sardinia - d. 10 April 1813 Paris self-taught
(succeeded Euler as Director of the Berlin
Academy of Sciences) --------- Descent from
Christian Gerling Ph.D. Göttingen 1812 Carl
Gauss Ph.D. Helmstedt 1799 ...... Johan Pfaff,
Ph.D. Göttingen 1786 Abraham Kästner Ph.D.
Leipzig 1739 ...... Christian Hausen Ph.D.
Halle-Wittenberg 1713 Johann Wichmannshaussen
Ph.D Leipzig 1685 .... Otto Mencke Ph.D. Leipzig
1665-6
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Notre Dame theory group (Walter on right, Jerry
Jones standing)
Others?????