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• W1970783480 abstract "There has been a wealth of recent infrared experimental data on van der Waals and hydrogen bonded complexes obtained under cooled, supersonic jet conditions where only a small fraction of the total bound quantum states can be elucidated. This partial set of data can often be well fit to a traditional Watson Hamiltonian derived from a rigid rotor perspective with low order centrifugal distortion effects included. In this paper we show that even in extremely floppy molecular systems with wide amplitude vibrational motion, the quantum term values are very well fit by a rigid or semirigid rotor Hamiltonian over the limited range of energy states accessible in a cooled beam. We provide explicit examples of this behavior by full quantum solutions in two extremes of floppy motion: (1) a symmetric triatomic with a square well bending potential (‘‘hinge’’) and (2) a nearly free internal rotor (‘‘pinwheel’’). These results show that potentials with fundamentally different topologies can be consistent with same data, and indicate that even the limits of nearly rigid and floppy internal motion may be difficult to distinguish from a limited set of rovibrational eigenvalues." @default.
• W1970783480 created "2016-06-24" @default.
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• W1970783480 date "1989-10-01" @default.
• W1970783480 modified "2023-10-17" @default.
• W1970783480 title "On the apparent spectroscopic rigidity of floppy molecular systems" @default.
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• W1970783480 doi "https://doi.org/10.1063/1.456865" @default.
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