E Extinction Correction Data

ITEMS READ:

E , followed by the type of extinction correction, the domain radius and the mosaic spread.

ASSUMPTIONS MADE:

That there is no extinction unless IEXTYP, the type of extinction correction, is either 1 or 2.

DETAILS:

IEXTYP=1 requests the Becker and Coppens Lorentzian model, and IEXTYP=2 requests the Becker and Coppens Gaussian model. For either model, the domain radius (DOMR) and the mosaic spread (MOSC) are required. The units of DOMR and MOSC, depend on those used for the scattering lengths, cell edges, wavelength and crystal dimensions. If the scattering lengths are in $10^{-12}$ cms, cell edges and wavelength in Å and crystal dimensions in mm then DOMR will be in units of nm ($10^{-7}$ cm), and MOSC in radians.

REFERENCE:

Becker and Coppens (1974) Acta Cryst A30 p129.

EXAMPLE:

E 1 100.0 17.4

ROUTINES WHICH READ THE CARDS:

Routine EXTINC calls INPUTE to read the E card.