CONSTRUCTION AND CALIBRATION OF A MASS SPECTROMETER FOR THE ANALYSIS OF LIGHT IONS.
Abstract
A magnetic mass spectrometer employing a 45 degree bending angle was constructed and calibrated as part of an experimental apparatus to study ion-molecule rearrangement collisions. It has a resolution (m/delta m) of about 40 with beam transmission in excess of 90%, and it will mass analyze charged particles up to mass number 40 with energies up to 1 KEV. The spectrometer, using a magnet current of 8 amps, has a maximum field strength of about 4 Kilogauss confined between 40 degrees wedge sector shaped pole pieces with a 3/4 in. gap width. Magnet current curves are given for mass analysis of ions through mass number 7 as a function of kinetic energy. A plasma source using electron-impact ionization was used to generate the ion beams of mass 1 to 4 while a thermal Beta-eucryptite source was used to produce Li+ beams of mass 6 and 7. Measurements of the energy spread of the ion beams indicate a typical value of delta E/E = 4% for the gas source and 1% for the thermal emitter. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Dec 01, 1967
- Accession Number
- AD0828271
Entities
People
- George Henry Strohsahl Jr
Organizations
- Naval Postgraduate School