Low Temperature Physics: 29, 165 (2003); https://doi.org/10.1063/1.1542437 (9 pages)
Физика Низких Температур: Том 29, Выпуск 3 (Март 2003), c. 225-236    ( к оглавлению , назад )

Particle transport phenomena in low temperature solids

M. Bargheer and N. Schwentner

Institut für Experimentalphysik, Freie Universität Berlin Arnimallee 14, 14195 Berlin, Germany
E-mail: nikolaus.schwentner@physik.fu-berlin.de

Received November 11, 2002


We review different approaches to measure the transport of F atoms and ions in rare gas matrices and compare the experimental results to simulations. Static measurements on sandwich structures and co-doped matrices yield rather long travel ranges beyond 2 nm, in accord with early classical simulations which predict a channeling of the F atoms in rare gas matrices. Nonadiabatic simulations show a rapid energy loss, fast nonadiabatic dynamics and only short travel ranges of typically 1 unit cell. The rapid energy loss, fast nonadiabatic transitions and the timescale for direct dissociation (~ 250 fs) are verified by fs-pump-probe experiments. It remains a challenge to account for the long-range migration when nonadiabatic processes are allowed in simulations, and to measure the long distance flights directly by ultrafast spectroscopy.

72.20.Jv - Charge carriers: generation, recombination, lifetime, and trapping