Mass spectrometer having means compensating electron transit time across the cathode of the electron multiplier专利检索-倍增极电子零件及设备专利检索查询-专利查询网

Mass spectrometer having means compensating electron transit time across the cathode of the electron multiplier

阅读：44发布：2023-04-04

专利汇可以提供Mass spectrometer having means compensating electron transit time across the cathode of the electron multiplier专利检索，专利查询，专利分析的服务。并且To improve the resolution of a mass spectrometer the emissive surface of the cathode for the electron multiplier is precisely angled with respect to the plane perpendicular to the axis of the ion focusing tube so that all ions of the same mass which pass through that plane at the same time impinge on those portions of the cathode surface closest to and farthest from the dynode cause electrons secondarily emitted therefrom to impinge upon the dynode at substantially the same time. This shortens the duration of the mass spectrum signals making it easier to distinguish one mass-spectrum line from another in the 200-500 amu range.，下面是Mass spectrometer having means compensating electron transit time across the cathode of the electron multiplier专利的具体信息内容。

权利要求

1. In combination with a time of flight mass spectrometer of the type having means for producing ions; means for accelerating the ions produced; a drift tube for receiving the accelerated ions; a grid disposed at the exit end of said drift tube and perpendicular to the longitudinal axis of said drift tube; and an electron multiplier for collecting the ions after their travel through said drift tube and exit from said grid, said electron multiplier including a cathode and a dynode, and wherein the ions produced are accelerated through said drift tube for separation into groups according to their mass to charge ratio (m/e) and wherein the ions impinging said cathode disposed at one end of said drift tube cause electrons to be propagated from said cathode and onto said dynode of said electron multiplier, the improvement wherein said cathode is disposed in a plane that makes an acute angle of about 1.2* with a plane that is perpendicular to the longitudinal axis of said drift tube such that the ratio D1 / D2 is less than 1, where D1 is the distance between said grid and a first point on said cathode impinged by an ion, and D2 is the distance between the grid and a second point on said cathode impinged by another ion, said second point on said cathode being closer to said dynode than said first point so that all the electrons propagated from the entire exposed area of said cathode, by impingement of a group of ions having the same mass, strike the dynode at the same time.

2. The combination of claim 1 wherein said dynode is disposed in a plane that makes an acute angle of about 1.2* with the plane of said cathode.

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Mass spectrometer having means compensating electron transit time across the cathode of the electron multiplier

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