【摘要】 本文利用脉冲紫外激光选择激发NH₃分子到（?）¹ A″₂电子激发态的v′₂=0～6振动能级（v₂振动）,然后检测新生态H原子的飞行时间谱（TOF）,研究了NH₂分子的光碎片动力学。能量的分配与母体分子激发的电子态振动能级有密切关系:经NH₃（（?））v′₂=0～2能级离解,穿过一势垒,产生的NH₂（（?））碎片在低的N=K_α转动能级上具有更多的布居;而经v′₂=3～6能级离解时,NH₂（（?））有较高的N=K_?转动能级的激发。更多还原

【Abstract】 The photodissociation dynamics of NH₃ molecules caused by pulsed UV laser excitation from ground state to the v’₂=0-6 vibrational levels to the （?）¹A"₂ electronic excited state has been investigated by monitoring the time-of-flight （TOF） spectra of the nascent H-atom products. The detailed energy disposal in NH₂ （（?）） fragments is sensitive to the initially excited vibronic level of parent molecule NH₃ （（?））: the NH₂ （（?）） fragments resulted from the v’₂=0-2 levels of NH₃（（?））, which tunnel through a potential barrier, populate more in the low N=K₄ rotational levels, while that from the v’₂=3-6 levels generate a population in higher N=K₄ rotational levels.更多还原