The valence atom of an alkali-metalatom has two states.
碱金属原子的价原子具有两种能态。
2
On the theoretical side, a number of calculations of cross sections, elastic as well as total, for positron-alkali-metalatom 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。
3
The valence atom of an alkali - metalatom has two states.