Umklappn.

/ˈʊmklap/

Forms: Also umklapp.

Etymology: translating German umklappprozess (R. Peierls 1919, in Ann. d. Physik III. 1073), < umklappen to turn down or over.

Physics.

Used attributively to designate interactions in a crystal lattice in which their total momentum is not conserved, and the momentum of the initial excitations is reversed. Abbrev. U- or u-process.

ΘΚΠ

the world > matter > physics > atomic physics > arrangement in crystal > [adjective] > involving reversal

Umklapp1951

1937 Physical Rev. 52 690/1 These authors neglect transitions due to the ‘Umklappprozesse’ of Peierls.]

1951 Proc. Royal Soc. A. 208 90 Further measurements made on a corundum crystal confirm the importance of the ‘Umklapp’ processes, postulated by Peierls, in causing thermal resistance.

1960 J. M. Ziman Electrons & Phonons iii. 133 We shall refer to U-processes, and, where wave vector is conserved,..N-processes.

1974 H. E. Hall Solid State Physics viii. 207 An Umklapp process can be thought of as one in which a phonon is Bragg reflected simultaneously with absorbing or emitting another phonon.

1975 H. M. Rosenberg Solid State vi. 99 In a continuous medium u-processes cannot occur.

1976 F. Cap tr. Busch & Schade Lect. Solid State Physics 67 At low temperatures the umklapp processes are essential for the establishment of thermal equilibrium in the crystal.

This entry has not yet been fully updated (first published 1986; most recently modified version published online June 2021).

单词	umklapp
释义	Umklappn. /ˈʊmklap/ Forms: Also umklapp. Etymology: translating German umklappprozess (R. Peierls 1919, in Ann. d. Physik III. 1073), < umklappen to turn down or over. Physics. Used attributively to designate interactions in a crystal lattice in which their total momentum is not conserved, and the momentum of the initial excitations is reversed. Abbrev. U- or u-process. ΘΚΠ the world > matter > physics > atomic physics > arrangement in crystal > [adjective] > involving reversal Umklapp1951 1937 Physical Rev. 52 690/1 These authors neglect transitions due to the ‘Umklappprozesse’ of Peierls.] 1951 Proc. Royal Soc. A. 208 90 Further measurements made on a corundum crystal confirm the importance of the ‘Umklapp’ processes, postulated by Peierls, in causing thermal resistance. 1960 J. M. Ziman Electrons & Phonons iii. 133 We shall refer to U-processes, and, where wave vector is conserved,..N-processes. 1974 H. E. Hall Solid State Physics viii. 207 An Umklapp process can be thought of as one in which a phonon is Bragg reflected simultaneously with absorbing or emitting another phonon. 1975 H. M. Rosenberg Solid State vi. 99 In a continuous medium u-processes cannot occur. 1976 F. Cap tr. Busch & Schade Lect. Solid State Physics 67 At low temperatures the umklapp processes are essential for the establishment of thermal equilibrium in the crystal. This entry has not yet been fully updated (first published 1986; most recently modified version published online June 2021). < n.1951
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