Show that the formula for low-energy electron diffraction (LEED), when the incident electrons are perpendicular to a crystal surface, may be written as sin
sinϕ=[nhc]/D(2mₑc²K)¹/²
where n is the order of the maximum, D is the atomic spacing, me is the mass of the electron, KE is the kinetic energy of the electron, and θ is the angle between the incident and diffracted beams.
