Generation of negative ions in the gas phase from a 12CaO{center_dot}7Al{sub 2}O{sub 3} membrane-coated ceramic heater under atmospheric pressure
- College of Arts and Sciences, University of Tokyo, Tokyo 153-8902 (Japan)
- Department of Chemical System Engineering, University of Tokyo, Tokyo 113-8656 (Japan)
- Research Center for Compact Chemical Process, National Institute of Advanced Industrial Science and Technology (AIST), Miyagi 983-8551 (Japan)
- Department of Environmental Chemical Engineering, Kogakuin University, Tokyo 192-0015 (Japan)
12CaO{center_dot}7Al{sub 2}O{sub 3} (C12A7) crystal is able to generate strong and high purity oxygen anion (O{sup -}) beam under reduced pressure. However, the emission of O{sup -} or related species under atmospheric pressure has not been evaluated. In this study, the characteristics of negative ion species emissions from the C12A7 membrane-coated ceramic heater under atmospheric pressure were investigated by quadrupole mass spectrometer. Negative ion species were confirmed to be emitted even under atmospheric pressure. It was supposed that the detected negative ion clusters, such as O{sup -}(H{sub 2}O){sub n}, O{sub 2}{sup -}(H{sub 2}O){sub n}, and CO{sub 4}{sup -}(H{sub 2}O){sub n}, were generated by the reaction of negative ions emitted from the heater with impurities in He gas.
- OSTI ID:
- 21175815
- Journal Information:
- Applied Physics Letters, Vol. 93, Issue 24; Other Information: DOI: 10.1063/1.3040305; (c) 2008 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 0003-6951
- Country of Publication:
- United States
- Language:
- English
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