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wave vector |
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wave vector [′wāv ‚vek·tər] (physics) A vector whose direction is the direction of phase propagation of a wave at each point in space, and whose magnitude is sometimes set at 2π/λ and sometimes at 1/λ, where λ is the wavelength. How to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit webmaster's page for free fun content. |
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where [DELTA][phi] is the phase shift, n is the real part of the index of refraction, k is the wavevector, N is the atomic density, [lambda] is the neutron wavelength, and d is the path length that the neutron beam traverses through the [H. This expression only applies when the momentum transfer is very much less than the scattered electron wavevector, which unfortunately does not apply at low energies above threshold. However, when the wavelength of light is only a few hundred times the crystal interatomic spacing, the symmetry-breaking effect of the finite value of the photon wavevector starts to become significant and gives rise to the effect. |
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