Extensive double-excitation states in atomic helium

Journal Article · Mon Mar 11 04:00:00 EST 1991 · Physical Review Letters; (USA)

DOI:https://doi.org/10.1103/PhysRevLett.66.1306· OSTI ID:5716135

Domke, M; Xue, C; Puschmann, A; Mandel, T; Hudson, E; Shirley, D A; Kaindl, G ^[1]; Greene, C H; Sadeghpour, H R ^[2]; Petersen, H ^[3]

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1. Institut fuer Experimentalphyik, Freie Universitaet Berlin, D-1000 Berlin 33, Germany (DE)
2. Joint Institute of Laboratory Astrophysics and Department of Physics, University of Colorado, Boulder, Colorado 80309-0440 (USA)
3. Berliner Electronenspeicherring enGesellschaft fuer Synchrotronstrahlung (BESSY) GmbH, D-1000 Berlin 33 (Germany)

High-resolution photoionization studies of He have revealed more than 50 states below the {ital N}=2--7 thresholds of He{sup +}, including sixteen ({ital sp},2{ital n}+) and five ({ital sp},2{ital n}{minus}) states in the {ital N}=2 series. With a resolving power of {ital E}/{Delta}{ital E}{congruent}10 000, states as narrow as 0.1 meV could be observed and linewidths were determined with an accuracy up to {plus minus}0.5 meV. Interchannel interferences, evident through effects on positions, shapes, and intensities of Rydberg lines, were interpreted within the framework of the multichannel quantum-defect theory.

• OSTI ID: 5716135
• Journal Information: Physical Review Letters; (USA), Journal Name: Physical Review Letters; (USA) Vol. 66:10; ISSN PRLTA; ISSN 0031-9007
• Country of Publication: United States
• Language: English

Related Subjects

640302* -- Atomic
Molecular & Chemical Physics-- Atomic & Molecular Properties & Theory
74 ATOMIC AND MOLECULAR PHYSICS
ACCURACY
ATOMS
AUTOIONIZATION
BESSY STORAGE RING
CATIONS
CHARGED PARTICLES
DATA
ELEMENTS
ENERGY
ENERGY LEVELS
EXCITED STATES
EXPERIMENTAL DATA
FLUIDS
GASES
HELIUM
HELIUM IONS
INFORMATION
IONIZATION
IONS
LINE WIDTHS
MECHANICS
MONOCHROMATORS
NONMETALS
NUMERICAL DATA
PHOTOIONIZATION
QUANTUM MECHANICS
RARE GASES
RESOLUTION
RESONANCE
RYDBERG STATES
STORAGE RINGS
THRESHOLD ENERGY