Anisotropic x-ray emission from heliumlike Fe24+ ions aligned by resonant coherent excitation with a periodic crystal potential.
We have measured deexcitation x rays emitted from the resonant coherently excited 2(1)P(1) state of heliumlike Fe24+ ions of 423 MeV/amu, planar channeling through a Si crystal. Large anisotropy in the angular distribution of deexcitation x-ray emission is observed: the x-ray emission in the direction parallel to the channeling plane is favored by a factor of 2 compared to the perpendicular direction. This anisotropy originates from the direction of the periodic crystal field, which populates specific m states in resonant coherent excitation and aligns the excited states.
Azuma
T
T
Department of Physics, Tokyo Metropolitan University, Hachioji, Tokyo 192-0397, Japan.
Takabayashi
Y
Y
Kondo
C
C
Muranaka
T
T
Komaki
K
K
Yamazaki
Y
Y
Takada
E
E
Murakami
T
T