He双激发态的正电子吸附
Positron attachment to the He doubly excited states
摘要：
用投影方法证明了氦原子三个双激发态上正电子的存在。e^+He（2s^2 1Se）、e^+He（3s^2 1Se）和e^+He（2s2p 3Po）态的结合能分别为0.447eV、0.256eV和0.486eV。用随机变分法和组态相互作用法计算了这些能量。这些态将以共振态的形式存在于e^+ + He连续谱中，而e^+He（2s^2 1Se）态可以在e^+ + He碰撞谱中检测到。用复数旋转方法计算了e^+He（2s^2 1Se）_i态的共振宽度为0.068eV。还预言了与He（ns^2）双里德堡系列有关的一系列e^+He（ns^2 1Se）共振的存在，并报道了一个明确的计算，证明了e^+He（3s^2 1Se）态的存在。
英文摘要：
The projection method is used to demonstrate the existence of positron attachment to three doubly excited states of helium. The e^+He(2s^2 1Se), e^+He(3s^2 1Se), and the e^+He(2s2p 3Po) states have binding energies of 0.447eV, 0.256eV and 0.486eV respectively. These energies were computed with the stochastic variational method and the configuration interaction method. These states will exist as resonances in the e^+ + He continuum and the e^+He(2s^2 1Se) state could be detectable in the e^+ + He collision spectrum. A resonance width of 0.068eV was computed for the e^+He(2s^2 1Se), state by using the complex rotation method. The existence of a series of e^+He(ns^2 1Se) resonances associated with the He(ns^2) double Rydberg series is also predicted and an explicit calculation demonstrating the existence of the e^+He(3s^2 1Se) state is reported.
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