title: Dynamical correlation in double excitations of helium studied by high-resolution and angular-resolved fast-electron energy-loss spectroscopy in absolute measurements.
abstract: The momentum transfer dependence of fundamental double excitation processes of helium is studied by absolute measurements using an angular resolved fast-electron energy loss spectrometer with high energy resolution. It elucidates the dynamical correlations, in terms of internal correlation quantum numbers, K, T, and A. The Fano profile parameters q, f(a), rho2, f, and S of doubly excited states (2)(1,0)+2 (1)S(e), (2)(1,0)+2 (1)D(e), and (2)(0,1)+2 (1)P(o) are reported as functions of momentum transfer K2. Qualitative analysis is given for the states of (2)(-1,0)+2 (1)S(e) and (2)(1,0)+2 (1)S(e).
authors: Laboratory of Bond-Selective Chemistry, Department of Modern Physics, University of Science and Technology of China, Hefei, Anhui 230027, China. xjliu@ustv.edu.cn
authors: Xiao-jing
authors: XJ
authors: Liu
authors: Lin-fan
authors: LF
authors: Zhu
authors: Zhen-sheng
authors: ZS
authors: Yuan
authors: Wen-bin
authors: WB
authors: Li
authors: Hua-dong
authors: HD
authors: Cheng
authors: Yu-ping
authors: YP
authors: Huang
authors: Zhi-ping
authors: ZP
authors: Zhong
authors: Ke-zun
authors: KZ
authors: Xu
authors: Jia-ming
authors: JM
authors: Li