High Magnetic Field Glow Discharge Ionization Source.
Technical rept. Jul 93-May 94,
FLORIDA UNIV GAINESVILLE DEPT OF CHEMISTRY
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We have modified our internal electrospray source, which operates inside the high magnetic field associated with Fourier transform ion cyclotron resonance fticr mass spectrometry, to allow it to serve as a glow discharge GD ionization source. Figure 1 shows the overall experimental apparatus for this system, and Figure 2 is an expanded view of the modifications which make glow discharge possible. Quite reasonable ion signals are obtained with this source, in spite of the fact that the glow discharge ionization is taking place at a magnetic field of about 1.8 tesla. This corresponds to a field at least a factor of 25 higher than has ever been used with glow discharge sources before. One example of an analysis of the 60Ni signal in a NIST 661 stainless steel signal is shown in Figure 3. Signal-to-noise calculations for the top trace yield a limit of detection of 38 ppm for the peak at mz 60. The predominant ion is 56Fe, arising from the high concentration of iron in the steel.
- Inorganic Chemistry
- Electricity and Magnetism
- Particle Accelerators
- Nuclear Physics and Elementary Particle Physics