Experiments of keV negative ions transmitted through straight and tapered glass capillaries: tilt angle dependence

Song, Hanyu; Yang, Z. T.; Yu, Lan; Zhou, Daijie; Zhou, Dianwei; Shao, Jianxiong; Yang, A. X.

doi:10.1140/epjd/e2020-100615-7

Cited by 1 publication

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“…要集中在正离子与玻璃微管的输运研究, 相较于正离子, 负离子为弱束缚系统, 与正离子入射情况有很大不同 [1] , 对低能负离子与锥形玻璃微管的输运研究较少, 且主要集中在负离子入射0°倾斜的锥形玻璃管的输运特性 [22,23] , 对不同倾斜角度的输运特性研究较少. 本文将重点研究低能负离子在不同倾斜角度锥形管中的输运过程, 获得出射粒子中心角度、二维分布谱图、相对透射率和半高宽(FWHM) 的演化情况 [1] .…”

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Study on transport process of 16 keV C– ions in tapered glass capillary: Role of capillary tilt angles

Niu,

Zhan,

Hua

et al. 2024

Acta Phys. Sin.

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The tapered glass capillaries have been widely used in physics, biology, materials. Currently, the transmission features of ions through the insulating tapered glass capillary are mainly focused on the interaction between positive ions and tapered glass capillaries, However the study on the transmission process of negative ions in tapered glass capillary is scarcely. In the present study, we have measured the transmission properties, such as the two-dimensional spectral distribution, the relatively transmission rate, the centroid angles, the charge state purity and the FWHM of the transmitted particles, of 16keV C- ions transmitted through the tapered glass capillary. As the tapered glass capillary tilt angle is equal to 0°, the transmitted particles are composed of three components, the Core, the C-of Halo and the C0 of Halo. As the tilt angle is small (0°-1°), the transmitted particles are composed of three components, the Core, the C- and the C0. As the tilt angle is large (>1°), there is no Core region, the transmitted particles are composed of two components, the C- and the C0. No matter how the tilt angle changes, the centroid angles of Core are always along the direction of the incident ions, independent of thee tilt angels. And the centroid angles of transmitted C- and C0 are always along the direction of the capillary axis. The transmission process of 16 keV C-ions in tapered glass capillary with different tilting angles is qualitatively analyzed. When the tilting angle is small (0°-1°), the C-ions are directly traveling straight through the back cone hole of tapered glass capillary, which are mainly composed of C-ions. When the tilt angle is large (>1°), the C-ions are not able to be directly traveling straight through the back cone hole of the tapered glass capillary, and the Core region does not appear. Due to the guiding effect of the negative charges deposited on inner wall of tapered glass capillary, the transmitted C- ions are located around the direction of the capillary axis. The tapered glass capillary have focusing effect on the incident ions. This experiment fills the lack of the studies of low-energy negative ions transmitted through tapered capillary and helps to strengthen the understanding of the transmission process of low-energy ions transmitted through tapered capillary.

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