elpty x y z
This card is used with the POLARIZATION card
The ellipticity elpty is the ratio of amplitudes of electric
field in the two orthogonal directions of elliptically polarized
light. Only the absolute value of the ratio is important for
nonmagnetic materials. The present code can distinguish left- and
right-circular polarization only with the XMCD or XNCD cards.
A zero value of the ellipticity corresponds to linear polarization,
and unity to circular polarization. The default value is zero.
x, y, z are coordinates of any nonzero
vector in the direction of the incident beam. This vector should be
approximately normal to the polarization vector.
* Average over linear polarization in the xy-plane
ELLIPTICITY 1.0 0.0 0.0 -2.0