Phys. Rev. A 79, 031401(R) (2009) [4 pages]Continuum phase shifts and partial cross sections for photoionization from excited states of atomic helium measured by high-order harmonic optical pump-probe velocity map imaging
Phase shift differences and ratios of radial dipole matrix elements of the outgoing S and D continuum waves from state-selected helium atoms are directly measured from the photoelectron angular distributions using pump-probe velocity map imaging. Aligned 1s3p 1P1 and 1s4p 1P1 states in helium are prepared by high-order harmonics and ionized with either 800, 400, or 267 nm light. The results allow for the determination of energy-dependent quantum defect differences and ratios of partial cross sections and agree favorably with theoretical calculations on electron scattering and photoionization. © 2009 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevA.79.031401
DOI:
10.1103/PhysRevA.79.031401
PACS:
42.65.Ky, 32.10.−f, 32.80.Rm, 32.70.Fw
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