# Abstract

__Katharina Vollmayr-Lee__: „Microscopic Picture of Aging in SiO_{2}: A Computer Simulation”

Universität Göttingen / Bucknell University, Pannsylvania, USA

Using molecular dynamics computer simulations, we study the aging
dynamics of amorphous SiO_{2}. Starting from fully equilibrated
configurations at high temperatures the system is quenched to
temperatures which are below T_{c}. We then observe the resulting
microscopic dynamics as a function of the waiting time t_{w}, the
time elapsed since the temperature quench. We use single
particle trajectories to identify "jumps" when the particle's
average position changes over a short time interval significantly
compared to its fluctuations. We find that the only tw-dependent
microscopic quantity is the number of jumping particles per unit
time. Similar to previous studies for fragile glass formers, we
show here for the strong glass former SiO_{2} that neither the
distribution of jump lengths nor the distribution of times spent
in the cage are t_{w}-dependent. We therefore find a surprising
similarity of the jump dynamics of fragile and strong glass formers.