State selection of O{sup +}({sup 4}{ital S}{sup o},{sup 2}{ital D}{sup o},{sup 2}{ital P}{sup o}) using resonance dissociative charge transfer of He{sup +}(Ne{sup +}, Ar{sup +})+O{sub 2} and radio frequency multipole ion guide techniques
- Ames Laboratory, USDOE and Department of Chemistry, Iowa State University, Ames, Iowa 50011 (United States)
By controlling the collision energies for dissociative charge transfer collisions of He{sup +}(Ne{sup +},Ar{sup +}) +O{sub 2} in a rf octopole ion guide gas cell, and by applying appropriate effective ion trapping potentials to the rf octopole ion guide, we show that state-selected O{sup +}({sup 4}{ital S}{sup {ital o}}), O{sup +}({sup 2}{ital D}{sup {ital o}}), and O{sup +}({sup 2}{ital P}{sup {ital o}}) reactant ion beams with high purities and usable intensities can be prepared for scattering experiments. This experimental scheme, which makes possible the enrichment of an ionic species with a lower kinetic energy distribution in a rf multipole ion guide, should be useful for state selection of other excited atomic ions by using appropriate dissociative charge transfer or dissociative photoionization processes.
- OSTI ID:
- 26095
- Journal Information:
- Review of Scientific Instruments, Journal Name: Review of Scientific Instruments Journal Issue: 4 Vol. 66; ISSN 0034-6748; ISSN RSINAK
- Country of Publication:
- United States
- Language:
- English
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