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H. Elnaggar et al.
Fig. 4.19 Angular dependence of XAS fundamental cross sections σ (1, 0), σ (2, 0), σ (3, 0),
σ (4, 0), σ (4, 4), and σ (4, −4). Here k is aligned with [100] and is rotated about [100] with
θ = 0 o for [001]
Fig. 4.20 Angular dependence of XAS for a quadrupole transition in a 3d 9 ion in an O h crystal
field (10D q = 1.1 eV) with an exchange field aligned along the z-axis (B = 0.05 eV). The wave
vector (k) is initially aligned to [001] and polarization () is circular. The angular dependence is
computed by rotating the system about the [100] axis
H. Elnaggar et al.
Fig. 4.19 Angular dependence of XAS fundamental cross sections σ (1, 0), σ (2, 0), σ (3, 0),
σ (4, 0), σ (4, 4), and σ (4, −4). Here k is aligned with [100] and is rotated about [100] with
θ = 0 o for [001]
Fig. 4.20 Angular dependence of XAS for a quadrupole transition in a 3d 9 ion in an O h crystal
field (10D q = 1.1 eV) with an exchange field aligned along the z-axis (B = 0.05 eV). The wave
vector (k) is initially aligned to [001] and polarization () is circular. The angular dependence is
computed by rotating the system about the [100] axis