Journal
PHYSICAL REVIEW A
Volume 79, Issue 3, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevA.79.031401
Keywords
atom-photon collisions; excited states; helium neutral atoms; high-speed optical techniques; optical pumping; photoelectron spectra; photoionisation
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Funding
- Director, Office of Science, Office of Basic Energy Sciences, Chemical Sciences, Geosciences, and Biosciences Division, U. S. Department of Energy [DE-AC02-05CH11231]
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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 P-1(1) and 1s4p P-1(1) 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.
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