The predissociation of NH
3 has been discussed from the molecular orbital consideration utilizing Shuler's method. The molecule, at first, absorbs the light of about 2000Â? and is excited to the first excited state
1A
1. In this state the planar molecular structure is found more stable than the pyramidal one. After having taken the former structure the molecule dissociates to NH
2(
2B
1) plus H(
2S), passing through the intermediate structure with symmetry C
2v. Meanwhile the property of the highest singly occupied orbital changes from 3s-like to antibonding on account of the crossing (in the approximation of single configuration) of the potential energy curves.
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