In physics, a wave vector (or wavevector) is a vector used in describing a wave, with a typical unit being cycle per metre. It has a magnitude and direction...
13 KB (2,112 words) - 15:12, 29 October 2024
Bloch's theorem (redirect from Bloch wave)
{\displaystyle \psi } is the wave function, u {\displaystyle u} is a periodic function with the same periodicity as the crystal, the wave vector k {\displaystyle...
36 KB (6,056 words) - 02:56, 30 November 2024
ky, kz) is the wave vector (in radians per meter), and ϕ 0 {\displaystyle \phi _{0}} is the phase angle (in radians). The wave vector is related to the...
21 KB (3,099 words) - 08:56, 7 December 2024
In quantum mechanics, wave function collapse, also called reduction of the state vector, occurs when a wave function—initially in a superposition of several...
23 KB (2,717 words) - 18:16, 21 November 2024
In physics, the Poynting vector (or Umov–Poynting vector) represents the directional energy flux (the energy transfer per unit area, per unit time) or...
34 KB (4,668 words) - 08:48, 9 December 2024
In special relativity, a four-vector (or 4-vector, sometimes Lorentz vector) is an object with four components, which transform in a specific way under...
47 KB (8,308 words) - 13:05, 26 October 2024
electromagnetic wave, the value of F {\displaystyle F} can be the electric field vector E {\displaystyle E} , or the magnetic field vector H {\displaystyle...
61 KB (7,810 words) - 01:29, 29 November 2024
"polarization" direction of an electromagnetic wave is given by its electric field vector. Considering a monochromatic plane wave of optical frequency f (light of vacuum...
74 KB (9,416 words) - 18:46, 19 December 2024
(Here the physics definition for the wave vector is used, which is 2 π {\displaystyle 2\pi } times the wave vector used in crystallography, see wavevector...
70 KB (8,041 words) - 17:05, 29 November 2024
Evanescent field (redirect from Evanescent Wave)
can be characterized by a wave vector where one or more of the vector's components has an imaginary value. Because the vector has imaginary components...
23 KB (3,164 words) - 17:09, 6 September 2024
2 × 1 column vector for a non-relativistic electron with spin 1⁄2). According to the superposition principle of quantum mechanics, wave functions can...
99 KB (13,587 words) - 16:07, 13 December 2024
Laue equations (redirect from Scattering vector)
outgoing wave vectors (to the crystal and from the crystal, by scattering), and G {\displaystyle \mathbf {G} } is a crystal reciprocal lattice vector. Due...
16 KB (3,072 words) - 20:08, 8 December 2024
Wavenumber (redirect from Wave number)
wavenumber is the magnitude of the wave vector. The space of wave vectors is called reciprocal space. Wave numbers and wave vectors play an essential role in optics...
14 KB (1,786 words) - 05:26, 19 July 2024
either energy or the wave vector k. To convert between the DOS as a function of the energy and the DOS as a function of the wave vector, the system-specific...
36 KB (5,578 words) - 07:50, 15 October 2024
a unit-length vector, the direction of propagation of the wave, and " ⋅ {\displaystyle \cdot } " denotes the dot product of two vectors. The parameter...
17 KB (2,866 words) - 19:49, 24 September 2023
Refraction (redirect from Wave refraction)
the magnitude of the wave vector depend on the wave speed this requires a change in direction of the wave vector. The relevant wave speed in the discussion...
21 KB (2,580 words) - 03:03, 7 December 2024
Wavelength (redirect from Wave length)
wavenumber k with a wave vector that specifies the direction and wavenumber of a plane wave in 3-space, parameterized by position vector r. In that case,...
35 KB (4,288 words) - 23:06, 15 November 2024
quasimomentum is a momentum-like vector associated with electrons in a crystal lattice. It is defined by the associated wave vectors k {\displaystyle \mathbf...
12 KB (1,474 words) - 01:26, 9 December 2024
Birefringence (redirect from Extraordinary wave)
as a wave with field components in transverse polarization (perpendicular to the direction of the wave vector). A mathematical description of wave propagation...
59 KB (6,588 words) - 02:43, 7 November 2024
be scalars, vectors, or any other physical or mathematical quantity. They can be complex numbers, as in a complex exponential plane wave. When the values...
7 KB (1,123 words) - 17:35, 18 December 2024
Fresnel equations (category Polarization (waves))
electromagnetic wave, the electric field E has the form where Ek is the (constant) complex amplitude vector, i is the imaginary unit, k is the wave vector (whose...
68 KB (8,182 words) - 06:52, 22 December 2024
single scattering or kinematical theory with conservation of energy (wave vector). Many different types of X-ray sources exist, ranging from ones used...
33 KB (4,265 words) - 17:54, 15 September 2024
{\mathbf {r} }}),} where i is the imaginary unit, k is a wave vector of length k, r is a position vector of length r, jℓ are spherical Bessel functions, Pℓ...
2 KB (332 words) - 11:08, 26 August 2023
Photon (redirect from Energy in a wave)
{\boldsymbol {p}}=\hbar {\boldsymbol {k}}~,} where k is the wave vector, where k ≡ |k| = 2π /λ is the wave number, and ω ≡ 2 πν is the angular frequency,...
107 KB (11,712 words) - 19:41, 19 December 2024
waves. The Langmuir wave is a purely longitudinal wave, that is, the wave vector is in the same direction as the E-field. It is an electrostatic wave;...
8 KB (1,336 words) - 23:23, 29 June 2024
U-process or Umklapp process) is a scattering process that results in a wave vector (usually written k) which falls outside the first Brillouin zone. If...
5 KB (558 words) - 05:17, 22 November 2024
scattering process the initial state wave vector ki of the electron wave function is scattered to a final state wave vector kf. Because the electron gas is...
9 KB (1,235 words) - 00:08, 15 June 2023
proposal of opposition of the wave vector and (Abraham) the Poynting vector. Other definitions include the opposition of wave vector to group velocity, and energy...
9 KB (1,143 words) - 11:51, 2 November 2024
Huygens principle of double refraction (category Polarization (waves))
angle constant (in rad), and k = (kx, ky, kz) is the wave vector of the wave (in rad/m). The wave vector is related to the angular frequency and speed of...
17 KB (2,048 words) - 20:50, 9 December 2024
Surface plasmon polariton (category Surface waves)
words, SPPs are always TM (transverse magnetic) waves. k is the wave vector; it is a complex vector, and in the case of a lossless SPP, it turns out...
39 KB (5,101 words) - 19:22, 6 November 2024