公开(公告)号：US4990856A

公开(公告)日：1991-02-05

申请号：US418789

申请日：1989-10-03

Applicant: Weston A. Anderson ,  James T. Arnold

Inventor： Weston A. Anderson ,  James T. Arnold

IPC: H01J49/04 ,  H01J49/38

CPC classification number: H01J49/04 ,  H01J49/38

Abstract: A small sample of material is introduced into a vacuum to be analyzed, by ionization of atoms or molecular fragments of the sample using an electron or photon beam. The ionized species are trapped in a structure that defines electric fields or a combination of electric and magnetic fields in such a way that their motions are confined to the interior of the trap and that their motions within the trap are characterized by unique and discrete frequencies of oscillation dependent on the mass-to-charge ratio of the individual species. In order to provide for the detection of the frequencies of the motions, additional electrical signals are applied to the trapping structure so as to cause the motions to take place with a considerable degree of coherence. Alternatively, the coherence may be caused by creation of the ions during a very short pulse of the electron or photon beam at a position within the trapping structure but displaced from a positon of equilibrium. An electrical response to the individual motions of the ions, taking place at discrete frequencies related to their mass-to-charge ratios, frequency analyzed to determine the mass-to-charge ratios of the ions contribute to that electrical response, thereby indicating the types of ions present and their respective quantities.

Abstract translation: 通过使用电子或光子束使样品的原子或分子片段离子化，将一小部分材料样品引入待分析的真空中。 电离物质被捕获在限定电场或电场和磁场的组合的结构中，使得它们的运动被限制在陷阱的内部，并且它们在陷阱内的运动由独特和离散的频率 振荡取决于个体物质的质荷比。 为了提供对运动的频率的检测，附加的电信号被施加到捕获结构，以便使运动以相当程度的一致性发生。 或者，可以通过在捕获结构内的位置处的电子或光子束的非常短的脉冲内产生离子而产生相干性，但是从平衡位置移位。 分析发生在与其质荷比相关的离散频率处的离子的单独运动的电响应，以分析频率以确定离子的质荷比来促成该电响应，从而指示类型 的离子存在和它们各自的量。