利用脉冲染料可调谐激光激发原子密度为10~(14)～10~(18)cm~(-3)的稠密碱金属钾蒸气,在5780(?)～5920(?)波段内测量了激光共振电离光谱.结果表明,除了钾原子4s—nd(n=10～16)、4s—ns(n=12～18)双光子跃迁以外,还出现了钾4P—7s、4P—5d跃迁.这种跃迁的电离光谱信号是由于在钾蒸气中钾分子-原子混合双光子跃迁而产生的.本文对钾蒸气混合双光子跃迁进行了讨论.

We have measured the resonant ionization spectrum of alkali-metal potassium vapor in the range of 5780 A - 5920 A, using a flashlamp pumped tunable dye laser. The results show that the two-photon transitions of atomic potassium 4s-ns (n=12-18), 4s-nd(n=10-16) and stronger atomic potassium 4p-7s, 4p-5d transitions have been obtained. These ionization signals of 4p-7s, 4p-5d transitions are produced from potassium dimer-potassium atom hybrid two-photo transitions. We have discussed the results.