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首页> 外文会议>International Conference on Synchrotron Radiation Instrumentation >Elliptically polarised soft x-rays produced using a local bump in MAX II — Characterisation of the degree of polarisation
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Elliptically polarised soft x-rays produced using a local bump in MAX II — Characterisation of the degree of polarisation

机译：椭圆偏振的软X射线在MAX II中使用局部凸点 - 表征极化程度

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MAX-lab has introduced a local perturbation to the electron orbit of the MAX II storage ring, providing users at the SX700 monochromator beam line, D1011, with elliptically polarised soft x-rays. This is achieved by using corrector magnets to send the electron orbit on an ascending or descending trajectory through the dipole magnet source. This simple "bump" approach has many advantages over and above insertion device based solutions. To illustrate the potential of the approach, the degree of circular polarisation, P_c, has both been calculated and measured. The calculation was made by applying the Stokes formalism to the intensities given by the standard dipole emission formula. Experimentally P_c was characterised using x-ray magnetic circular dichroism measurements. In such experiments magnetic contrast scales directly proportional to P_c. Using a 25 atomic layer bcc Fe film deposited on the Cu(100) surface as a calibration standard the spin moment, ms, was determined. By comparing the values of ms obtained here with those reported earlier, the degree of circular polarisation could be estimated. At ～ 715 eV the calculated and measured values of Pc are 0.93 and 0.85, respectively.
机译：Max-Lab已经向Max II存储环的电子轨道引入了本地扰动，为用户提供了SX700单色梁线D1011的用户，具有椭圆偏振的软X射线。这是通过使用校正器磁体来实现通过偶极磁源上升或下降轨迹的电子轨道来实现的。这种简单的“凹凸”方法具有超过基于插入设备的解决方案的许多优点。为了说明方法的电位，圆极化程度P_C已经计算和测量。通过将Stokes形式主义应用于标准偶极发射公式给出的强度来进行计算。通过X射线磁性圆形二色性测量表征实验P_C。在这样的实验中，磁对比直接与P_C成比例。使用沉积在Cu（100）表面上的25原子层BCC Fe膜作为校准标准，确定旋转力矩，MS。通过比较这里获得的MS的值与前面报道的那些，可以估计圆极化程度。在〜715，PC的计算和测量值分别为0.93和0.85。

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