Acquisition of Ultra-High Angular and Energy Resolution Photoemission System

这种新型超高分辨率光电发射系统的新设计将分别提供优于5 meV和0.2度的能量和角分辨率。5兆电子伏的分辨率大约是目前最先进的光谱仪的4-5倍。0.2度的角分辨比典型的角分辨光发射光谱仪提高了约10倍。最重要的是，该分析仪使人们能够同时获得80个不同角度的光谱，而传统光谱仪通常需要获取一个光谱。此外，大尺寸的分析仪也极大地提高了光谱仪的效率。这意味着新光谱仪的总计数率将比目前该领域最好的光谱仪至少提高100倍。该设备将用于斯坦福大学的各种研究项目。它也将提供给其他机构的研究人员。该系统的成功实施将对许多令人兴奋的先进材料研究领域产生非常积极的影响。这包括高温超导体、半导体、富勒烯及其衍生物、磁性材料、莫特绝缘体、重费米子和混合价化合物。新光谱仪提供的极高能量和角分辨率将非常有效地解决当代物理学中的一些关键问题。例子包括铜酸盐中的超导隙和重费米子中的近藤共振。该系统的获得将极大地增强正在进行和未来的研究，以及斯坦福大学和其他机构的教育环境。

The novel design of this new ultra-high resolution photoemission system will give an energy and angular resolution of better than 5 meV and 0.2 degrees, respectively. The 5 meV resolution is about a factor of 4-5 times better than most current state of the art spectrometers. The 0.2 degrees angular resolution is about a factor of 10 times better than the typical angle- resolved photoemission spectrometer. Most importantly, the analyzer enables one to simultaneously acquire 80 spectra at different angles in the time it would normally take to acquire one spectrum with a conventional spectrometer. In addition, the large analyzer size also dramatically enhances the efficiency of the spectrometer. This means that the new spectrometer will have a total counting rate at least 100 times better than the best spectrometer in the field now. This equipment will be used for a variety or research programs at Stanford University. It will also be made available to researchers from other institutions. The successful implementation of this system will have a very positive impact on many exciting areas of research on advanced materials. This includes the high-temperature superconductors, semiconductors, the fullerenes and their derivatives, magnetic materials, the Mott insulators, and heavy fermion and mixed valence compounds. Some of the key issues in contemporary physics will be very effectively addressed by the extremely high energy and angular resolution made available by the new spectrometer. Examples include the superconducting gap in cuprates and the Kondo resonance in heavy fermions. Acquisition of this system will greatly enhance ongoing and future research, as well as the educational environment at Stanford University and other institutions.