Radial distributions of {open_quotes}mass shifting ions{close_quotes} in a quadrupole ion trap mass spectrometer
- Los Alamos National Lab., NM (United States)
- Purdue Univ., W. Lafayette, IN (United States)
An early problem in the development of the commercial ion trap mass spectrometer was the phenomena of {open_quotes}mass-shifts{close_quotes}, where two ions, having the same nominal m/z, appear at different points on the mass scale. Although the problem has been circumvented by the use of ion traps elongated in the z-direction (stretched geometry), the phenomena itself remains to be understood and is an area of active interest in ion trap mass spectrometry. One possible explanation is that ions having different chemical properties, e.g., polarizability, have different radial distributions in the ion trap. If these ions experience an inhomogeneous field, say from field faults introduced by holes in the endcaps, the ions will experience different average values of q for a given RF voltage and will be ejected at different times (apparent masses).
- OSTI ID:
- 61885
- Report Number(s):
- CONF-9405234--
- Country of Publication:
- United States
- Language:
- English
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