Institute of Theoretical Physics

NA-QMD: Non-Adiabatic Quantum Molecular Dynamics

Theoretical Atomic and Molecular Physics Group

Introduction

People

Publications

Dynamics in laser fields

 H2+:

C60: Giant breathing mode

Organic molecules: Isomerization

Dynamics in collisions

Ion - fullerene: "Stopping power"

Atom - cluster: Transparency

Cluster - cluster: Fusion

Kr8+ + N2: Coulomb explosion

"Stopping power" of H+ and Ar+ in collisions with C60


In the two Figs., the calculated energy loss E of the particle as function of the c.m. impact velocity v is shown [1]. In the movies the (totally different) collision mechanisms are visualized.

(a) H+ with v=0.05 a.u. is reflected. (backward scattering)

(b) Ar+ with v=0.05 a.u., however, destroys the cage completely due to pure vibrational excitations. ("nuclear stopping power")

(c) Ar+ with v=0.45 a.u. penetrates the cage freely without any vibrational excitation, but the cage is electronically highly excited. ("electronic stopping power")
Electron-vibration coupling leads to excitation of a giant breathing mode!


                
       (a) Backward scattering (b) "nuclear stopping power" (c) "electronic stopping power"


  1. T. Kunert and R. Schmidt,
    Excitation and Fragmentation Mechanisms in Ion-Fullerene Collisions,
    Phys. Rev. Lett. 86, 5258 (2001).