Complex substate amplitudes formed in double electron capture.

Abstract

Complex amplitudes and their dependence upon the projectile scattering angle have been measured for $|L,M〉$ substates of doubly excited $1s[2s2p^{1}P]^{2}P$ and the ${1s2p}^{2}^{2}D$ terms of ${\mathrm{C}}^{3+}$ formed in double electron capture by 25 keV ${\mathrm{C}}^{5+}$ ions from He atoms. These are extracted from Auger electron anisotropy measured with respect to the incident beam and scattering plane by a coincident electron--scattered ion technique. The results are the most complete experimental description of a low energy double capture collision.