[2] We thank Joe Bricker (QSO) and Shintaro Yazuka (JEOL) for their kind help and advice. This work was supported by DOE BES SBIR program Grant no. DE-SC0013121. Yimei Zhu was supported by the U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences, under Contract no. DE-SC0012704.
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