Performance of a photoelectron momentum microscope in direct- and momentum-space imaging with ultraviolet photon sources oleh Tzu-Hung Chuang, Chuan-Che Hsu, Wei-Sheng Chiu, Jyun-Syong Jhuang, I-Chun Yeh, Ruei-San Chen, Shanjr Gwo, Der-Hsin Wei