TY - JOUR
T1 - 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
AU - Haber, Louis H.
AU - Doughty, Benjamin
AU - Leone, Stephen R.
PY - 2009/3/3
Y1 - 2009/3/3
N2 - 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 P11 and 1s4p P11 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.
AB - 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 P11 and 1s4p P11 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.
UR - http://www.scopus.com/inward/record.url?scp=63149084081&partnerID=8YFLogxK
U2 - 10.1103/PhysRevA.79.031401
DO - 10.1103/PhysRevA.79.031401
M3 - Article
AN - SCOPUS:63149084081
SN - 1050-2947
VL - 79
JO - Physical Review A - Atomic, Molecular, and Optical Physics
JF - Physical Review A - Atomic, Molecular, and Optical Physics
IS - 3
M1 - 031401
ER -