Conversion dynode: Difference between revisions
From Mass Spec Terms
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A conversion [[dynode]] is used to increase the secondary emission characteristics for heavy ions and thus reduce the mass discrimination of the detector. A high potential, of opposite polarity to the ions detected, is used to attract these ions to the dynode. [[Secondary electron]]s are produced when the ions hit the dynode and are subsequently recorded via the detector used. | A conversion [[dynode]] is used to increase the secondary emission characteristics for heavy ions and thus reduce the mass discrimination of the detector. A high potential, of opposite polarity to the ions detected, is used to attract these ions to the dynode. [[Secondary electron]]s are produced when the ions hit the dynode and are subsequently recorded via the detector used. | ||
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Surface that is held at high potential so that ions striking the surface produce secondary charged particles that are subsequently detected. | |||
Note: For positive ions, the potential is negative and the secondary particles are electrons and negative ions. For negative ions, the potential is positive and the secondary particles are positive ions. | |||
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#R. J. Beuhler, L. Friedman. Int. J. Mass Spectrom. Ion Phys. 23, 81-97 (1977). | |||
#G. C. Stafford. Environ. Health Perspect. 36, 85 (1980). | |||
#K. Rinn, A. Muller, H. Eichenauer, E. Salzborn. Rev. Sci. Instrum. 53, 829-837 (1982). | |||
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Revision as of 21:05, 11 April 2010
Obsolete Template
| DRAFT DEFINITION |
| Conversion dynode |
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A conversion dynode is used to increase the secondary emission characteristics for heavy ions and thus reduce the mass discrimination of the detector. A high potential, of opposite polarity to the ions detected, is used to attract these ions to the dynode. Secondary electrons are produced when the ions hit the dynode and are subsequently recorded via the detector used. |
| Considered between 2004 and 2006 but not included in the 2006 PAC submission |
| This is an unofficial draft definition presented for information and comment. |
This template is no longer used.
