Abstract:
An ion source device that includes apparatus for pulse injecting ions into a field-free drift region where those ions separate according to their velocities or kinetic energies. A cyclically varying electric field is established at the end of the fieldfree drift region. Each charged particle enters the electric field at a time determined by its velocity and interacts with the field in a manner dependent upon the phase of the field upon receipt of that particle. The cyclically varying electric field decreases the velocity distribution for particles received during the first half of a cycle, and increases the distribution for particles received during the second half of a cycle. Mass analyzing apparatus is disposed to receive and measure the concentrations of species of charged particles expelled from the cyclically varying field. The output provided by the mass analyzing apparatus also facilitates variation of the cyclically varying electric field to provide a particular species with a desired velocity or kinetic energy distribution.
Abstract:
A method of making electrodes for a quadrupole type mass spectrometer which comprises the steps of extruding glass into rods having a hyperboloidal surface and coating the hyperboloidal surface with a conductive film by sputtering or vapor deposition.