X-ray lines close to KLL auger electron energies from Fe, Co, Ni, and Cu monocrystals
By x-ray bombardment of metal monocrystals (Fe, Co, Ni, and Cu), x-rays of KLL radiative Auger electrons (KLL RAE) can be observed on the low energy side of the Ka lines. The energies of the KLL RAE x-rays of each monocrystal are the same for different lattice planes and when different kinds of x-ray tubes. Mo, W, and Cu target tubes, are used. Therefore, the peak energies detected within the KLL Auger electron energy limit are interpreted as KLL RAE x-rays. The measured intensity ratios of KLL/Ka are about 0.3%. Additionally, the ratio of I(K/9)/I(Ka) and I(Si escape peak)/I(Ka) are measured. All of these values agree well with theoretical values. The beam shapes of KLL RAE x-rays are studied by taking pictures on x-ray films. The intensity distribution for Ni and Cu are measured by changing the crystal angle with respect to the incident x-ray beam near the Bragg angles of the KLL RAE x-rays. It is shown that the KLL RAE x-rays are very sharp and stimulated when the crystal is set at the Bragg angle of the KLL RAE with respect to the incident beam, which contains both the pumping radiation and Bremsstrahlung of frequencies in the KLL RAE range in which the KLL x-rays stimulation is achieved.