BEAT STRUCTURE IN THE DOUBLY EXCITED RYDBERG STATES CONVERGING TO THEN = 2THRESHOLD OF HELIUM

R. Follath (), G. Reichardt, O. Schwarzkopf and W. Gudat
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R. Follath: BESSY, Albert-Einstein-Straß e 15, 12489 Berlin, Germany
G. Reichardt: BESSY, Albert-Einstein-Straß e 15, 12489 Berlin, Germany
O. Schwarzkopf: BESSY, Albert-Einstein-Straß e 15, 12489 Berlin, Germany
W. Gudat: BESSY, Albert-Einstein-Straß e 15, 12489 Berlin, Germany

Surface Review and Letters (SRL), 2002, vol. 09, issue 01, 165-168

Abstract: TheN = 2double excitation series of helium was examined with the high performance U125 plane grating monochromator at BESSY II set to a resolving power of 90 000. A hitherto unresolved beat structure in the principal series was observed at very high excitation levels. The beat can be explained by the mixing of two series converging to different ionization thresholds and having an energy spacing corresponding to the energy split between the2p1/2and the2p3/2level of singly ionized helium. This indicates that the electron interaction at high excitation levels must be described within the JK coupling scheme.

Date: 2002
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DOI: 10.1142/S0218625X02002038

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