Foundations of Physics

, Volume 31, Issue 1, pp 7–26

Quasiclassical Born–Oppenheimer Approximations


  • Oleg Zaitsev
    • Department of PhysicsUniversity of Maryland
  • R. Narevich
    • Department of Physics and AstronomyUniversity of Kentucky
  • R. E. Prange
    • Department of PhysicsUniversity of Maryland

DOI: 10.1023/A:1004153019473

Cite this article as:
Zaitsev, O., Narevich, R. & Prange, R.E. Foundations of Physics (2001) 31: 7. doi:10.1023/A:1004153019473


We discuss several problems in quasiclassical physics for which approximate solutions were recently obtained by a new method, and which can also be solved by novel versions of the Born–Oppenheimer approximation. These cases include the so-called bouncing ball modes, low angular momentum states in perturbed circular billiards, resonant states in perturbed rectangular billiards, and whispering gallery modes. Some rare, special eigenstates, concentrated close to the edge or along a diagonal of a nearly rectangular billiard are found. This kind of state has apparently previously escaped notice.

Copyright information

© Plenum Publishing Corporation 2001