The molecular asymmetric rigid rotor Hamiltonian as an exactly solvable model

Details The molecular asymmetric rigid rotor Hamiltonian as an exactly solvable model The molecular asymmetric rigid rotor Hamiltonian as an exactly solvable model

2008-03-18

arxiv.org/abs/0803.2562v1

Physics

Mathematical Physics

10 pages, LaTeX

Scientific paper

Representations of the rotation group may be formulated in second-quantised language via Schwinger's transcription of angular momentum states onto states of an effective two-dimensional oscillator. In the case of the molecular asymmetric rigid rotor, by projecting onto the state space of rigid body rotations, the standard Ray Hamiltonian $H(1,\kappa,-1)$ (with asymmetry parameter $1 \ge \kappa \ge -1$), becomes a quadratic polynomial in the generators of the associated dynamical $su(1,1)$ algebra. We point out that $H(1,\kappa,-1)$ is in fact quadratic in the Gaudin operators arising from the quasiclassical limit of an associated $su_q(1,1)$ Yang-Baxter algebra. The general asymmetric rigid rotor Hamiltonian is thus an exactly solvable model. This fact has important implications for the structure of the spectrum, as well as for the eigenstates and correlation functions of the model.

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