用染料激光激发钾蒸气,发现了钾原子的两种电离机制和三个电离通道:能量积聚诱导的电离,4S-6S和4S-4D双光子共振三光子电离.对前两个电离通道,分别研究了电离谱与钾蒸气温度和激光强度的关系,发现了钾原子的辐射囚禁效应和钾原子电离的非线性现象,并给出了定性解释.

Atomic potassium is ionized by three channels when it is excited by a pulse dye laser. They are energy pooling induced ionization, 4S→6S and 4S→4D two photon resonant three photon ionization. The ionization current intensity at various vapor temperature and laser intensity were investigated for the former two ionization channels. The atomic radiation trapping and nonlinear ionization were found in ionization current spectra. The qualitative explanations for above phenomena are given.