
local susceptibility tensor in direct space 

Fourier components of the local susceptibility tensor 

reciprocallattice vector 

polarization vector of an Xray wave 

wavevector of an Xray wave 

matrix corresponding to pointgroup operator 

polarization vector perpendicular to the scattering plane 

polarization vector in the scattering plane 

Bragg angle 

azimuthal angle of rotation about a reciprocallattice vector 

vector potential of the electromagnetic wave 

momentum of an electron 

frequency of an electromagnetic wave 

wavelength of the radiation 

energy of a discrete atomic level 

spin of an electron 

scattering amplitude 

scattering vector 

LeviCivita symbol 

transition frequency for states a and c 

energy width of the excited state 

probability that the state of the scatterer is occupied 

tensor atomic factor 

structurefactor tensor of rank 2 

intensity of the reflection 

notation of the electric multipole transition. : the dipole; : the quadrupole 

notation of the magnetic multipole transition 

orbital moment of electron 

dipole–dipole tensor atomic factor 

symmetric part of the dipole–dipole tensor atomic factor 

antisymmetric part of the dipole–dipole tensor atomic factor 

thirdrank tensor describing the dipole–quadrupole resonant Xray scattering 

part of the thirdrank tensor invariant under time inversion and symmetric under the permutation of j and k 

part of the thirdrank tensor noninvariant under time inversion and symmetric under the permutation of j and k 

part of the thirdrank tensor invariant under time inversion and antisymmetric under the permutation of j and k 

part of the thirdrank tensor noninvariant under time inversion and antisymmetric under the permutation of j and k 

fourthrank tensor describing the quadrupole–quadrupole resonant Xray scattering 
Tr 
trace of matrix 

magnetic moment of an atom 
Y_{LM} 
spherical tensor 

component of the spherical tensor depending only on the incident and scattered radiation 

component of the spherical tensor associated with the tensor properties of the absorbing atom 