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 Angle-resolved photoemission spectroscopy ： ウィキペディア英語版
Angle-resolved photoemission spectroscopy

Angle-resolved photoemission spectroscopy (ARPES), is a direct experimental technique to observe the distribution of the electrons (more precisely, the density of single-particle electronic excitations) in the reciprocal space of solids. The technique is a refinement of ordinary photoemission spectroscopy, studying photoemission of electrons from a sample achieved usually by illumination with soft X-rays. ARPES is one of the most direct methods of studying the electronic structure of the surface of solids.
ARPES gives information on the direction, speed and scattering process of valence electrons in the sample being studied (usually a solid). This means that information can be gained on both the energy and momentum of an electron, resulting in detailed information on band dispersion and Fermi surface.
The technique is also known as ARUPS (angle-resolved ultraviolet photoemission spectroscopy) when using ultraviolet light (as opposed to X-rays) to generate photoemission.
==Theory==
From conservation of energy, we have
:$E = \hbar \omega - E_ - \phi.$
where E is the binding energy of the electron. Photon momentum is often neglected because of its relatively small contribution compared with electron momentum.
In the typical case, where the surface of the sample is smooth, translational symmetry requires that the component of electron momentum in the plane of the sample be conserved:
:$\hbar k_=\hbar k_=\sqrt\sin\theta$
where
*$E_ =$ kinetic energy of the outgoing electron — measured.
*$\hbar \omega =$ incoming photon energy — measured.
*$\phi =$ electron work function (energy required to remove electron from sample to vacuum)
*$\hbar k_f=$ momentum of the outgoing electron, measured by angle
*$\hbar k_i=$ initial momentum of the electron
However, the normal component of electron momentum $k_$ might not be conserved. The typical way of dealing with this is to assume that the final in-crystal states are free-electron-like, in which case one has
:$k_=\frac\sqrt$
in which $V_0$ denotes the band depth from vacuum, including electron work function $\phi$; $V_0$ can be determined by examining only the electrons emitted perpendicular to the surface, measuring their kinetic energy as a function of incident photon energy.
The equations for energy and momentum can be solved to determine the dispersion relation between the binding energy, $E$, and the wave vector, $\mathbf_i=\mathbf_+\mathbf_$, of the electron.

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