Experiments of keV negative ions transmitted through straight and tapered glass capillaries: tilt angle dependenceHanyu Song, Zhisui Yang, Loufei Yu, Daijie Zhou, Dianwei Zhou, Jianxiong Shao and Aixiang YangEur. Phys. J. D, 74 10 (2020) 208DOI: https://doi.org/10.1140/epjd/e2020-100615-7