INFRARED ROTATION AND VIBRATION-ROTATION BANDS OF ENDOHEDRAL FULLERENE COMPLEXES - HE-AT-C-70

We calculate the far-infrared absorption spectrum of the endohedral fu llerene He@C-70. In this molecule the He inclusion experiences a stron gly anisotropic potential V(rho, z). The 2D Schrodinger equation gover ning its rovibrational motion is solved variationally. The spectrum co nsists of strong P- and R-branches (Delta m = +/-1) and a much weaker Q-branch (Delta m = 0), and peaks near 100cm(-1). Despite its apparent complexity, however, the eigenvalue spectrum is essentially regular, and the system displays little evidence of chaos.