Using laser tomography to investigate the radial distributions of mass-shifting compounds in an ion trap mass spectrometer
- and others
In order to further improve the mass measurement accuracy of the ion trap mass spectrometer, the origins of small mass shifts that occur under certain conditions must be better understood. Photodissociation was used as a tool to determine the distributions of ion clouds in both the axial and radial dimensions under various conditions. The results show that the size of the ion cloud significantly increases in the radial dimension with ion abundance. With the ideal electrode geometry (r{sub o}=1.0 cm, z{sub o}=0.707 cm), the rate at which the cloud expands is compound dependent. At a given ion abundance, different compounds have different radial distributions which correlate to the various magnitudes of mass shifts for these compounds. As the distance between the endcaps, 2z{sub o}, is symmetrically stretched about the ring electrode, the compound-dependent mass shifts are greatly reduced. CDC acknowledges support by an American Chemical Society, Division of Analytical Chemistry Fellowship sponsored by The Dow Chemical Company Foundation.
- OSTI ID:
- 126068
- Report Number(s):
- CONF-950402--
- Country of Publication:
- United States
- Language:
- English
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