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A Review of the "Digital Turn" in the New Literacy Studies by Kathy Mills

By Kathy Mills

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25 sources - one is a conservation principle and another is the geometrical relationship between the polarization of photon and the direction of magnetic moment. While the selection rules which originate from conservation laws restrain the transition itself, geometrical relationships restrict the observation of the scattering intensity. The most important principle behind the selection rules in x-ray spectra is the conservation of angular momentum. T h e allowed change of tlie angular momentum of the electron which participates in the transition depends on tlie helicity of photon which is absorbed (emitted) in the process.

9). 10). 8) magnetic ordered states. 12), it would be expected that the intensities of spectra are also very different. However, surprisingly, they have quite similar over-all trends. This provides some evidence that the contribution of the radial transition matrix elements is local and dominant component to other details of the electronic structure. As discussed above, while the number of 5d empty states are affected somewhat by magnetic ordering, tlie radial wave functions in the core region (inside the 4f orbital) need not be greatly affected.

The most important principle behind the selection rules in x-ray spectra is the conservation of angular momentum. T h e allowed change of tlie angular momentum of the electron which participates in the transition depends on tlie helicity of photon which is absorbed (emitted) in the process. The angular momentum carried by the photon is determined by its polarity, which is +1 (-1)for tlie right (left) circular polarized photon. Therefore, an electron which absorbs a right (left) circular polarized photon which propagates parallel t o the magnetic field direction is able to excite only if there are available empty states that have one increased (decreased) total angular momentum quantum number.

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