It was previously shown that the experimental measurement of the lifetime of gas-phase negative ions formed in autoionization states during resonant electron capture by molecules is inherently fraught with inaccuracy due to adsorption of ions on the walls of the ionization chamber, with some of them surviving there and staying stabilized as 'eternal' till they eventually desorb back into the vacuum and merge with the total ion flow; this leads to an upward distortion of lifetime measurements. This paper describes a technique for removing desorbed ions from the total flow using an ion filter that lets only gas-phase ions pass into the detection system but detains the de?sorbed ions due to the differences among their kinetic energies.

中文翻译：

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解吸过程中的弱电流测量

先前已经表明，由于分子在离子化室壁上的吸附，实验测量了在分子被共振电子俘获期间在自电离态下形成的气相负离子的寿命固有地不准确。在那里并保持稳定为“永恒”状态，直到它们最终解吸回真空并与总离子流合并为止。这导致寿命测量值的向上失真。本文介绍了一种使用离子过滤器从总流中除去解吸离子的技术，该技术仅允许气相离子通过检测系统，但由于其动能之间的差异而保留了解吸离子。