| 摘要 |
1,265,146. Particle spectrometers. PERKINELMER Ltd. 28 March, 1969 [28 March, 1968], No. 14929/68. Heading H1D. In an electrostatic, charged particle, energy analyser discrete auxiliary electrodes 4F, 4H adjoin the inner surfaces of the analyser plates 4A, 4B to direct the peripheral particle rays to the same focus as the paraxial rays. The device shown is a photoelectron spectrometer with a sample chamber 2, from which photoelectrons are emitted through a slit formed at the apex of two cusp-shaped wall portions 2A, and an electron multiplier 3 disposed, respectively, at the entry and exit ends of the cylindrical analyser 4. Anti-fringing cusp-shaped members 5, one or both of which may be adjustable, define the exit aperture of the analyser 4. There may be a similar provision at the entry end of the analyser. The analyser plates 4A, 4B are supported by a base-plate 4C and a top plate (not shown). Central, cylindrical flanges 4D extending from the top and bottom plates serve to straighten the electrostatic field. Each auxiliary electrode 4F, 4H which is disposed in a slot 4E, 4G may be replaced by an array of two or more individual electrodes. Potentials for the analyser plates and opposite potentials for the auxiliary electrodes may be derived from a common supply and all four potentials swept together. The analysis, of the energy spectrum may be effected by scanning the voltage applied to an apertured electrode between the electron source and the analyser which is maintained at fixed potentials. |
