摘要
我們回顧過去和現(xiàn)在正子原子在電離過程中碰撞理論的發(fā)展。 從最終狀態(tài)下合并所有相互作用，在一個同等立足處和保留少量碰撞動力學(xué)的一個確切的物體分析開始, 我們進(jìn)行或重或輕不同的比較, 并且從它們影響電離橫剖面的角度進(jìn)行分析。 終于, 我們發(fā)現(xiàn)了理論碰撞過程中的連續(xù)統(tǒng)一體, 中心點和其它運動學(xué)機(jī)制 。
主題詞: 電離; 碰撞動力學(xué); 驅(qū)散; 電子光譜; 反物質(zhì); 正電子沖擊; 中心點電子; 導(dǎo)軌式電子
Abstract
We review past and present theoretical developments in the description of ionization processes in positron–atom collisions. Starting from an analysis that incorporates all the interactions in the final state on an equal footing and keeps an exact account of the few-body kinematics, we perform a critical comparison of different approximations, and how they affect the eva luation of the ionization cross section. Finally, we describe the appearance of fingerprints of capture to the continuum, saddle-point and other kinematical mechanisms.
Keywords: Ionization; Collision dynamics; Scattering; Electron spectra; Antimatter; Positron impact; Saddle-point electrons; Wannier; CDW