| Popis: |
Within the uncertainty of the experiment, the rate of F center formation per unit energy retained in Harshaw KCl irradiated at 78°K at equal energy flux is the same whether the incident-photon energy is below (2.62 and 2.81 keV), between (3.31 and 3.59 keV), or above (3.69 and 4.01 keV) the chlorine (2.82 keV) and potassium (3.61 keV) K edges. Since an initial photoionization in the L II or L III Subshell of a chlorine ion is expected to result in an average loss of 2.3 electrons, while an initial photoionization in the K shell is expected to result in an average loss of 4.2 electrons, the result reported here indicates that the multiple ionization of the halogen (Varley mechanism) is not the dominant mechanism of Frenkel defect formation in KCl at 78°K. Each of the beams used was the X-ray fluorescent output of LiCl, or of K 2 C 2 O 4 ·H 2 O, or of CaO. |
