Abstract

In this study, experiments are performed to study the transmission of 15 keV C⁻ ions through straight and tapered borosilicate glass capillaries. The tilt angle is varied from 0° to 0.8°. In a straight capillary, the transmitted ions produced only one spot on the detector, and its intensity declined with increasing tilt angle. In this case, almost 98% of the transmitted particles maintained their initial charge. However, in the tapered capillary, the transmitted particles formed a different pattern composed of a core and a halo. The negative ion fractions of the core and the halo were 97.5% and 42.5% at a 0° tilt angle, respectively. Therefore, the particles formed the halo by scattering after colliding with the inner surface of the capillary, and most of them were neutralized. As the tilt angle increased, the intensity and negative ion fraction of the transmitted particles declined, and the halo gradually became quite asymmetric. These results indicate that the scattering process plays a role in the transmission.

Graphical abstract

中文翻译：

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通过直线和锥形玻璃毛细管传输的keV负离子的实验：倾斜角依赖性

摘要

在这项研究中，实验进行研究15keV的C中的传输^-离子通过直的和锥形的硼硅玻璃毛细管。倾斜角度在0°到0.8°之间变化。在直毛细管中，透射离子仅在检测器上产生一个点，并且其强度随倾斜角的增加而下降。在这种情况下，几乎98％的透射粒子保持其初始电荷。但是，在锥形毛细管中，透射粒子形成了由芯和晕环组成的不同图案。在0°倾斜角下，核和卤素的负离子分数分别为97.5％和42.5％。因此，粒子在与毛细管的内表面碰撞后通过散射形成晕圈，并且大部分被中和。随着倾斜角的增加，透射粒子的强度和负离子分数下降，光环逐渐变得不对称。这些结果表明，散射过程在透射中起作用。

图形概要