4 X-ray Dichroisms in Spherical Tensor and Green’s Function Formalism
127
Fig. 4.21 Angular dependence of XAS fundamental spectra for a quadrupole transition in a 3d 9
ion in an O h crystal field with an exchange field aligned along the z-axis. a Circular dichroism
active terms σ (1, 0) and σ (3, 0). b Linear dichroism active terms σ (4, 0), σ (4, 4) and σ (4, −4).
The angular dependence is computed by rotating the system about the [100] axis
Fig. 4.22 Angular dependence of XAS for a quadrupole transition in a 3d 9 ion: a in an O h crystal
field (10D q = 1.1 eV). b The difference between calculation (a) and in an O h crystal field with an
exchange field aligned along the z-axis (10D q = 1.1 eV and B = 0.05 eV). The wave vector (k)
is initially aligned to [001] and polarization () is circularly polarized. The angular dependence is
computed by rotating the system about the [100] axis
127
Fig. 4.21 Angular dependence of XAS fundamental spectra for a quadrupole transition in a 3d 9
ion in an O h crystal field with an exchange field aligned along the z-axis. a Circular dichroism
active terms σ (1, 0) and σ (3, 0). b Linear dichroism active terms σ (4, 0), σ (4, 4) and σ (4, −4).
The angular dependence is computed by rotating the system about the [100] axis
Fig. 4.22 Angular dependence of XAS for a quadrupole transition in a 3d 9 ion: a in an O h crystal
field (10D q = 1.1 eV). b The difference between calculation (a) and in an O h crystal field with an
exchange field aligned along the z-axis (10D q = 1.1 eV and B = 0.05 eV). The wave vector (k)
is initially aligned to [001] and polarization () is circularly polarized. The angular dependence is
computed by rotating the system about the [100] axis