Übersetzung für 'Umklapp' von Englisch nach Deutsch

Umklapp process <U-process, u-process>

Umklappprozess {m} <U-Prozess>phys.

Umklapp scattering

Umklappprozess {m}phys.

• In a metal the resistivity at low temperatures is dominated by electron-electron scattering in combination with umklapp scattering.
• ... remote interface phonon scattering, Umklapp scattering).
• Therefore, these processes are also known as Umklapp (U) processes and can only occur when phonons with sufficiently large "q"-vectors are excited, because unless the sum of q2 and q3 points outside of the Brillouin zone the momentum is conserved and the process is normal scattering (N-process).
• However, if we hold fixed the atoms of a crystal, the dynamics of an electron or other particle in the crystal depend on how it moves relative to the crystal, and particle momentum can change by interacting with the atoms of a crystal — for example in Umklapp processes.
• For phonon-phonon scattering, effects by normal processes (processes which conserve the phonon wave vector - N processes) are ignored in favor of Umklapp processes (U processes).

• ... 2) As the wire diameter is reduced, the phonon boundary scattering dominates over phonon–phonon Umklapp scattering, which decreases the thermal conductivity with an increase in temperature.