A General Powder X-Ray Photography

Abstract

AT the outset of calculation, no assumption whatever is made as to the symmetry and dimensions of the unit cell. The powder photograph is simply treated as that of a triclinic crystal without special relationship between its constants. The reflexion hkl in the powder photograph, then, may be expressed in terms of its reciprocal lattice¹, thus: where θ is the Bragg angle observed, λ the wavelength used and a^*, b^*, c^*, α^*, β^*, γ^* are the reciprocal axial lengths and angles to be determined.