TY - JOUR
T1 - Excitation of the n=2 states of helium by positron impact
AU - Caradonna, Peter
AU - Sullivan, James P.
AU - Jones, Adric
AU - Makochekanwa, Casten
AU - Slaughter, Daniel
AU - Mueller, Dennis W.
AU - Buckman, Stephen J.
PY - 2009/12/7
Y1 - 2009/12/7
N2 - A high-resolution (ΔE∼55 □ meV) trap-based positron beam has been used to measure absolute scattering cross sections for the excitation of the resolved 2 S1, P states of helium at energies between threshold and 38 eV. The experimental integral cross sections, which have typical uncertainties of 10% or less, are compared with several theoretical calculations, and the agreement is generally very favorable. In particular, a new convergent close-coupling approach shows excellent agreement with the experimental data.
AB - A high-resolution (ΔE∼55 □ meV) trap-based positron beam has been used to measure absolute scattering cross sections for the excitation of the resolved 2 S1, P states of helium at energies between threshold and 38 eV. The experimental integral cross sections, which have typical uncertainties of 10% or less, are compared with several theoretical calculations, and the agreement is generally very favorable. In particular, a new convergent close-coupling approach shows excellent agreement with the experimental data.
UR - http://www.scopus.com/inward/record.url?scp=71549128982&partnerID=8YFLogxK
U2 - 10.1103/PhysRevA.80.060701
DO - 10.1103/PhysRevA.80.060701
M3 - Article
SN - 1050-2947
VL - 80
JO - Physical Review A - Atomic, Molecular, and Optical Physics
JF - Physical Review A - Atomic, Molecular, and Optical Physics
IS - 6
M1 - 060701
ER -