quasimomentum
Noun
Meaning
quasimomentum (plural quasimomentums or quasimomenta)
crystal momentum
Examples
To U-process to occur the decaying phonon to have a wave vector q 1 that is roughly half of the diameter of the Brillouin zone, because otherwise quasimomentum would not be conserved.
Phonon quasimomentum is defined as ℏq and differs from normal momentum because it is only defined within an arbitrary reciprocal lattice vector.