Momentum dependent energy loss near edge structures using a CTEM: the reliability of the methods available

The methods used to extract the momentum dependence of the energy loss near edge structure are compared. The improved counting statistics of the 45° method relative to the axial method for equivalent momentum resolution are noted. The experimental conditions required for the successful application of the method are also investigated and, examining Cu L edge data for YBa2Cu3O7−δ as obtained in a number of different manners, it is concluded that it is essential to modify the exact orientation for the 45° method so as to minimise the effects of elastic scattering.