A complete set of quantum numbers for the eigenstates of the Na_(3)^(+) system has been introduced. The structure of the ground rotation band has been deduced based on symmetry considerations. This band is found to be different from that of H3^(+), though they are similar in dynamics.
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机译：Observation of forbidden transitions of ammonium ion (NH+4) ngr;3band and determination of ground state rotational constants. Observation of ngr;3band allowed transitions of ND+4
机译：Microwave spectrum of alkali metal tetrahydroborate. II. Rotational transitions in the ground and excited vibrational states and molecular structure of LiBH4
机译：Cation Dependence of Crystal structure and Band parameters in a series of molecular Conductors, β'-(Cation)[pd(dmit)2]2 (dmit = 1,3-dithiole-2-thione-4,5-dithiolate)
