Ion detection technique has been successfully used in the study of rydberg states of na2 by pulse optical - optical double resonance . high - lying rydberg states near ionization limit have been observed and high sensitive and high gain spectra have been obtained . this technique is very useful for molecular spectroscopy 本文首次实现了钠分子体系中离子探测脉冲激光光谱，研究了钠分子电离限附近的高里德堡态，获得了高灵敏度和高增益的光谱，拓宽了分子光谱研究领域。
