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Problem: Momentum Resolution

  A neutron source provides a monochromatic beam neutrons, with wavelength of tex2html_wrap_inline5515 Å The divergence of the beam is tex2html_wrap_inline5517 arc seconds. There is a collimator on the detector side, providing the same angular resolution. The sample has simple cubic structure of approximate lattice spacing a=3.55Å.

Describe the experimental geometry for the most accurate measurement of the lattice spacing. What are the angles of the incident and diffracted beam relative to the crystal planes? Make a sketch of this geometry.

 

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Laszlo Mihaly
Thu Oct 31 13:23:11 EST 1996

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