在中等能量下正电子与碱金属碰撞的弹性截面，总截面已经有理论工作计算出来了。
On the theoretical side, a number of calculations of cross sections, elastic as well as total, for positron-alkali-metal atom systems at intermediate energies have been carried out.
在中等能量下正电子与碱金属碰撞的弹性截面，总截面已经有理论工作计算出来了。
On the theoretical side, a number of calculations of cross sections, elastic as well as total, for positron-alkali-metal atom systems at intermediate energies have been carried out.
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