TY - JOUR A1 - Soff, Gerhard A1 - Schlüter, Paul A1 - Müller, Berndt A1 - Greiner, Walter T1 - Self-energy of electrons in critical fields T2 - Physical review letters N2 - The energy shift of K electrons in heavy atoms due to the self-energy correction has been calculated. This process is treated to all orders in Zα, where Z denotes the nuclear charge. For the superheavy system Z=170, where the K-shell binding energy reaches the pair-production threshold (E1sb∼2mc2), a shift of +11.0 keV is found. This shift is almost cancelled by the vacuum polarization, leaving a negligible effect for all quantum-electrodynamical corrections of order α but all orders of Zα. Y1 - 2006 UR - http://publikationen.ub.uni-frankfurt.de/frontdoor/index/index/docId/2476 UR - https://nbn-resolving.org/urn:nbn:de:hebis:30-29246 UR - http://link.aps.org/abstract/PRL/v48/p1465 VL - 48 IS - 21 SP - 1465 EP - 1468 ER -