Algebraic solutions for the asymmetric rotor

Exact algebraic solutions for the energy eigenvalues and eigenstates of the asymmetric rotor are found using an infinite-dimensional algebraic method. The theory exploits a mapping from the Jordan-Schwinger realization of the SO(3) similar to SU(2) algebra to a complementary SU(1, 1) structure. The Bethe ansatz solutions that emerge are shown to display the intrinsic Viere rgruppe (D-2) symmetry of the rotor when the angular quantum number I is an integer, and the intrinsic quaternion group Q (i.e., the double group D-2* ) symmetry when I is a half integer. (C) 1999 Academic Press.