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File:ARPES - sample and analyzer reference frames - polar angle change.svg

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ARPES spectrometer measures angular dispersion in a slice α along its slit, so in order to map the band structure over a two-dimensional momentum space one needs to turn the sample, changing its roll/polar angle ϑ, pitch/tilt τ, or yaw/azimuth φ. Here, the change in polar angle is shown: ϑ=-25°,
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ARPES spectrometer accepting electrons emitted into polar angle ϑ and ±8° around.
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Angles in ARPES - sample and analyzer reference frames - polar/roll change
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ARPES - sample and analyzer reference frames - polar angle change.svg
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File:ARPES - sample and analyzer reference frames - polar angle change.svg
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