Particle transport phenomena in low temperature solids

• Veröffentlicht in: Физика низких температур
• Datum: 2003
• Hauptverfasser: Bargheer, N., Schwentner, M.
• Format: Artikel
• Sprache: Englisch
• Veröffentlicht: Фізико-технічний інститут низьких температур ім. Б.І. Вєркіна НАН України 2003
• Schlagworte: Electronically Induced Phenomena: Low Temperature Aspects
• Online Zugang: https://nasplib.isofts.kiev.ua/handle/123456789/128812
• Назва журналу: Digital Library of Periodicals of National Academy of Sciences of Ukraine
• Zitieren: Particle transport phenomena in low temperature solids / M. Bargheer, N. Schwentner // Физика низких температур. — 2003. — Т. 29, № 3. — С. 225-236. — Бібліогр.: 42 назв. — англ.

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.