| Abstrakt: |
Six methods of estimating appearance potentials from ionization efficiency curves of ions arising from single, competitive, consecutive and isolated ionic reactions are evaluated, using computed electron-impact ionization efficiency curves as 'experimental' data. Of the linear extrapolation, semi-log, second derivative, energy compensation, Warren and critical slope methods, a modified critical slope method gives the most accurate appearance potentials for fragment ions. Experimental data are presented to support this conclusion. [ABSTRACT FROM AUTHOR] |
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