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The excitation of the degenerate $E_1$ carbonyl stretching vibrations indimanganese decacarbonyl is shown to trigger wave packet circulation in thesubspace of these two modes. On the time scale of about 5 picosecondsintramolecular anharmonic couplings do not cause appreciable disturbance, evenunder conditions where the two $E_1$ modes are excited by up to about twovibrational quanta each. The compactness of the circulating wave packet isshown to depend strongly on the excitation conditions such as pulse durationand field strength. Numerical results for the solution of the seven-dimensionalvibrational Schr\"odinger equation are obtained for a density functional theorybased potential energy surface and using the multi-configuration time-dependentHartree method.

Carbonyl Vibrational Wave Packet Circulation in Mn$_2$(CO)$_{10}$ Driven by Ultrashort Polarized Laser Pulses