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利用氢原子里德堡态标记的时间飞渡技术研究了H2O在121和157nm的光解离，并测量出了这两个波长下的OH产物的振动和转动态分布。实验结果表明，121nm下的H2O光解离主要产生高转动激发的OH只有很少振动激发。而在157nm的光解产生OH的振动激发只有很少转动激发。研究表明高振动激发OH（v≥2）的相对布居在LIF测量的工作中被严重低估了，因此指出LIF技术定量测量产物OH的振动态分布是有问题的。
The photodissociation of H2O at 121 and 157 nm was studied by time-flying Fermi technique using the Rydberg state labeled hydrogen atoms. The vibrational and rotational distributions of OH at these two wavelengths were measured. The experimental results show that there is only a small vibrational excitation of OH at 121nm with OH mainly generating high rotational excitation. The photolysis at 157 nm produces vibrational excitation of OH with little rotational excitation. Studies have shown that the relative population of OH (v ≥ 2) excited by high vibration is seriously underestimated in the work of LIF measurement. Therefore, it is pointed out that LIF technique has some problems in quantitatively measuring the vibrational distribution of OH.