-
公开(公告)号：US4032782A
公开(公告)日：1977-06-28
申请号：US692846
申请日：1976-06-04
CPC分类号： H01J49/4215 , H01J49/4255
摘要： A method of selecting a material for the construction of a multipole mass filter that is temperature stable or in other words, the R.sub.o parameter remains invariant with change in temperature. The coefficients of thermal expansion of the quadrupole rods and mounting structure are chosen so that a constant ratio of the two is provided which in turn is determined by the geometrical construction of the filter.
-
2.发明授权Mass spectrometer system and method for control of ion energy for different masses 失效质谱仪系统及控制不同质量离子能量的方法
公开(公告)号：US4214160A
公开(公告)日：1980-07-22
申请号：US664046
申请日：1976-03-04
CPC分类号： H01J49/4215
摘要： Apparatus and method for programming the ion energy of ions being analyzed by a quadruple mass spectrometer where the axis potential applied to the quadruple rods is caused to vary in synchronism with a mass scan in order that the ions of each mass being analyzed may transit the quadruple with the most advantageous energy for proper analysis (that is, with substantially equal velocities) and the application of the ion scan voltage will not distort the fringing field at the entrance to the quadrupole.
摘要翻译： 用于对通过四重质谱仪进行分析的离子的离子能量进行编程的装置和方法，其中施加到四极杆上的轴电位与质量扫描同步地变化，以使得被分析的每个质量的离子可以转运四倍 具有用于适当分析的最有利的能量（即，具有基本相等的速度），并且离子扫描电压的施加不会扭曲四极入口处的边缘场。
-
公开(公告)号：US4816675A
公开(公告)日：1989-03-28
申请号：US119224
申请日：1987-11-04
申请人： William J. Fies , Michael S. Story
发明人： William J. Fies , Michael S. Story
CPC分类号： H01J49/4215 , H01J49/0095
摘要： An unbalanced radio frequency voltage is supplied between two pairs of conductive rods of a quadrupole mass filter of a mass spectrometer system. Means are provided for d.c. voltage polarity reversal for monitoring positive and negative ions. The d.c. voltage is derived by rectification of the radio frequency voltage.
摘要翻译： 在质谱仪系统的四极质量过滤器的两对导电棒之间提供不平衡的射频电压。 提供手段 用于监测正负离子的电压极性反转。 直径 电压通过射频电压的整流得到。
-
公开(公告)号：US5756996A
公开(公告)日：1998-05-26
申请号：US675966
申请日：1996-07-05
CPC分类号： H01J49/147 , H01J49/145
摘要： An external ion source assembly in which ion are formed in an ion volume by the interaction of energetic electrons and gas molecules. The effective energy of the electrons entering the ion volume is controlled by changing the voltage between the electron source (filament) and the ionization volume whereby ions having sufficient energy for ionizing atoms and molecules leave the electron source and enter the ionization volume only during an ionization period. The ion source assembly can be used both for electron impact ionization (EI) and for chemical ionization (CI).
摘要翻译： 外部离子源组件，其中通过能量电子和气体分子的相互作用在离子体中形成离子。 通过改变电子源（细丝）和离子化体积之间的电压来控制进入离子体积的电子的有效能量，由此离子具有足够的电离原子和分子的能量离开电子源并且仅在电离过程中进入离子化体积 期。 离子源组件可用于电子碰撞电离（EI）和化学电离（CI）。
-
-
-
搜索结果
4 条记录 (耗时 0.021 秒)
