TY - JOUR
T1 - Angular distribution of the fluorescence of helium doubly photo-excited states converging on the He+ (N=2)ionization threshold
AU - Lambourne, J.G.
AU - Penent, F.
AU - Lablanquie, P.
AU - Hall, R.I.
AU - Ahmad, M.
AU - Zitnik, M.
AU - Bucar, K.
AU - Hammond, Peter
AU - Stranges, S.
AU - Richter, R.
AU - Alagia, M.
AU - Coreno, M.
PY - 2003
Y1 - 2003
N2 - The asymmetry parameter β for fluorescence photons emitted during the radiative decay of the sp2,n+(1Po), sp2,n−(1Po), 2pnd(1Po) and 2pnd(3Do) series of helium doubly excited states, formed by the absorption of linearly polarized synchrotron radiation, has been measured. The results are compared with recent theoretical calculations (Žitnik et al 2002 Phys. Rev. A 65 032520). At high n the β parameter is shown to increase and oscillate due to the excitation of triplet states, optically accessible from the helium ground state due to spin–orbit effects.
AB - The asymmetry parameter β for fluorescence photons emitted during the radiative decay of the sp2,n+(1Po), sp2,n−(1Po), 2pnd(1Po) and 2pnd(3Do) series of helium doubly excited states, formed by the absorption of linearly polarized synchrotron radiation, has been measured. The results are compared with recent theoretical calculations (Žitnik et al 2002 Phys. Rev. A 65 032520). At high n the β parameter is shown to increase and oscillate due to the excitation of triplet states, optically accessible from the helium ground state due to spin–orbit effects.
U2 - 10.1088/0953-4075/36/21/013
DO - 10.1088/0953-4075/36/21/013
M3 - Article
VL - 36
SP - 4351
EP - 4359
JO - Journal of Physics B: Atomic Molecular and Optical Physics
JF - Journal of Physics B: Atomic Molecular and Optical Physics
SN - 0953-4075
IS - 21
ER -