3-D QUADRUPOLE ION TRAP MASS SPECTROMETER.
Abstract
Two mass spectrometers of the three-dimensional quadrupole type were constructed, along with the associated electronics. The electrodes of the mass spectrometers were accurately machined from stainless steel to the shape of hyperboloids of revolution. The mass range is from 1 to 75 atomic mass units. Heavier masses can be stored in the spectrometer, but cannot be easily mass-analyzed with the present electronics. The ion storage properties of these units are extremely good. Ions were stored in the mass spectrometer for days at low pressures. An interesting property was observed that may be useful in ion storage experiments. The presence of a neutral light gas, such as helium, was found to make heavier ions much more stable. The ion densities that can be stored in the spectrometer were found to be somewhat higher than had originally been expected. A new phenomenon discovered in this work (self-ejection of ions due to ion plasma resonances) enabled an independent density determination to be obtained. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Apr 18, 1969
- Accession Number
- AD0688621
Entities
People
- N. Rey Whetten
- Peter H. Dawson
Organizations
- General Electric