Observation of New Rydberg Series and Resonances in Doubly Excited Helium at Ultrahigh Resolution

Journal Article · Tue Oct 01 00:00:00 EDT 1996 · Physical Review Letters

DOI:https://doi.org/10.1103/PhysRevLett.77.3086· OSTI ID:388348

Schulz, K; Kaindl, G; Domke, M ^[1]; Bozek, J D; Heimann, P A; Schlachter, A S ^[2]; Rost, J M ^[3]

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1. Institut fuer Experimentalphysik, Freie Universitaet Berlin, Arnimalle 14, D-14195 Berlin-Dahlem (Germany)
2. Advanced Light Source, Lawrence Berkeley National Laboratory, 1 Cyclotron Road, Berkeley, California 94720 (United States)
3. Fakultaet fuer Physik, Universitaet Freiburg, Hermann-Herder-Strasse 3, D-79104 Freiburg (Germany)

We report on a striking improvement in spectral resolution in the soft x-ray range to 1.0meV at 64.1eV, measured via the {mu}eV-wide 2,{minus}1{sub 3} double-excitation resonance of helium. This ultrahigh resolution combined with the high photon flux at undulator beam line 9.0.1 of the Advanced Light Source have allowed observation of new Rydberg series and resonances below the {ital N}=3 threshold of doubly excited He. The obtained resonance parameters (energies, lifetime widths, and Fano-{ital q} parameters) are in excellent agreement with the results of state-of-the-art calculations. {copyright} {ital 1996 The American Physical Society.}

• Research Organization: Lawrence Berkeley National Laboratory
• DOE Contract Number: AC03-76SF00098
• OSTI ID: 388348
• Journal Information: Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 15 Vol. 77; ISSN 0031-9007; ISSN PRLTAO
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
ADVANCED LIGHT SOURCE
EXCITED STATES
HELIUM
RESOLUTION
RESONANCE
RYDBERG STATES