UNDER THE PERMUTATION-INVERSION GROUPS, THE INFLUENCE OF TUNNEL EFFECT ON THE MOLECULAR STATES

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<正> Ⅰ. INTRODUCTION The symmetry of non-rigid molecules can be described by Longuet-Higgins’ permutation-inversion groups (PI groups). A PI group is composed of (1) the identity and permutations on the coordinates of spins and orbitals of identical
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