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FIZIKA A 10 (2001) 3 , 105-112
 
THE TWO-PHOTON DECAY OF 1s2s 1S0-LIKE STATES IN
HEAVY ATOMIC SYSTEMS
PAUL H. MOKLERa and ROBERT W. DUNFORDb
aGSI, Planckstrasse 1, D-64291 Darmstadt, Germany
bARGONNE National Laboratory, Argonne, IL 60439, U.S.A.
Dedicated to Professor Kseno Ilakovac on the occasion of his 70th
birthday
Received 24 May 2001; Accepted 5 September 2001
Online 30 December 2001
In He-like systems the direct decay of the 1s2s 1S0 state to the
1s2 1S0 ground state is "forbidden". The
transition 1s2s 1S0® 1s2 1S0
by two photons sensitively probes the structure of the complete atomic system. In
particular, the shape of the two-photon spectrum is sensitive to it and also reveals for
heavy atomic numbers details of relativistic effects in strong central fields. A brief
survey on this field of research is given with special emphasis on high nuclear charge Z.
PACS numbers: 31.30.Jv, 32.80.Wr
UDC 539.183
Keywords: heavy He-like systems, two-photon decay, 1s2s 1S0® 1s2 1S0 transition, relativistic
effects
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