Abstract
We report the results of the experimental determination of theappearance energy values AE(Xn + /X) for the formation ofmultiply charged Ne, Ar and Xe ions up to n = 4 (Ne), n = 6 (Ar)and n = 8 (Xe) following electron impact on Ne, Ar and Xe atomsusing a dedicated high-resolution electron impact ionizationmass spectrometer. The data analysis uses the Marquart-Levenberg algorithm, which is an iterative, nonlinearleast-squares-fitting routine, in conjunction with either atwo-function or a three-function fit based on a power threshold law.This allows us to extract the relevant AEs and correspondingexponents for a Wannier-type power law from the measurednear-threshold data. The values of the AEs determined in thiswork are compared with other available experimental andspectroscopic values of the AEs and the extracted exponents arecompared with other available experimental data and with thepredictions of the various Wannier-type power law models.
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