| 氨分子在000和201带的选择光离解 |
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| 引用本文： | 解笑湘,J. BIESNER,K. H. WELGE.氨分子在000和201带的选择光离解[J].物理学报,1988,37(8):1260-1266. |
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| 作者姓名： | 解笑湘 J. BIESNER K. H. WELGE |
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| 作者单位： | (1)联邦德国Bielefeld大学物理系; (2)中国科学院安徽光学精密机械研究所 |
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| 摘 要： | 本文利用脉冲紫外激光(UV)选择激发氨分子到?1A″2电子激发态的两个最低振动能级ν′2=0和ν′2=1(ν2振动),然后检测新生态H原子的飞行谱(TOF),研究了氨分子的光碎片动力学。光谱证实了最近所测的离解能D00(H-NH2)=4.645eV;绝大多数生成的NH2(X2B1)基处于非振动激发,但是具有围绕a惯性轴的高度转动激发。通过NH3(?)的ν′2=1光离解产生的NH2(X)基具有较高的内部激发,并且显示了在N=Ka转动能级上的反转布居。
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| 收稿时间： | 1987-10-30 |
SELECTIVE PHOTODISSOCIATION OF AMMONIA AT 000 AND 201 BANDS |
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| XIE XIAO-XIANG,J. BIESNER and K. H. WELGE.SELECTIVE PHOTODISSOCIATION OF AMMONIA AT 000 AND 201 BANDS[J].Acta Physica Sinica,1988,37(8):1260-1266. |
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| Authors: | XIE XIAO-XIANG J BIESNER and K H WELGE |
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| Abstract: | The photofragnentation dynamics of ammonia molecules following pulsed UV laser excitation of ground state to the two lowest levels ν′2 = 0 and 1 (ν2 vibrational mode) of their ?1(A"2) electronic excited state has been investigated by monitoring thetime-of-flight spectra of the nascent H-atom products. The spectra confirm recent revised estimates of the quantity D00(H-NH2) = 4.645 eV and reveals that the majority of the accompanying NH2 (X2B1) fragments are formed vibrationally unexcited, but with high levels of rotational excitation specifically concentrated about the a-inertial axis. The NH2(X) fragments resulting from photodissociation via the ν′2 = 1 level of NH3(?) carry a higher level of internal excitation and show an inverted population distribution over the N = Ka rotational levels.
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