Dh. Yu et al., SPIN-POLARIZED ELECTRON-EXCITATION OF NEON 3P(J=1) STATES, Journal of physics. B, Atomic molecular and optical physics, 30(7), 1997, pp. 1799-1812
The angular momentum properties of incident transversely polarized ele
ctrons and radiated photons have been combined with scattering symmetr
ies to reveal the effects of exchange and spin-orbit coupling as well
as some propensity rules for excitation and decay of the 3p states of
the neon atom. Integrated Stokes parameters, P-1, P-2 and P-3, have be
en measured for the decay radiations of wavelengths 616.4, 603.0, 626.
7, 638.3 and 703.3 nm from the 2p(5)3p'[1/2](1), 2p(5)3p'[3/2](1), 2p(
5)3p[3/2](1) and 2p(5)3p[1/2](1) states, respectively. While these sta
tes are intermediately (jl) coupled, their LS compositions partially e
xplain some phenomena. For the states having a dominant triplet compon
ent, both the exchange and the spin-orbit interaction within the atom
are important in the excitation, while the spin-orbit interaction play
s the significant role for the state dominated by a singlet component.
Decay photons from a common upper state with Delta J = 1 have larger
linear polarization than those with Delta J = 0 and -1 while those fro
m a P-2(1/2) core upper state have larger linear polarizations than th
ose from a P-2(3/2) core upper state. The state multipoles are derived
from the measured Stokes parameters. The influence of negative-ion re
sonances near threshold on the Stokes parameters and the state multipo
les is very strong in some cases. The core state effects on the alignm
ent of excited states are investigated.