Electron impact ionization cross sections of phosphorus and arsenic molecules

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Abstract
This paper reports on measurements of electron impact direct ionization and dissociative ionization total cross sections of arsenic As4 and As2 molecules and phosphorus P4 and P2 molecules. Molecular species are produced by thermal effusion. The various ions resulting from electron impact are analysed by mass spectrometry. The electron energy range is 0-200 eV. For each ionization reaction, the threshold value, the behaviour in the vicinity of the threshold, as well as the main features of the curve are given. At the maximum in the ionization efficiency curve, the values of the direct ionization cross sections for P4, As4, P2 and As2 are respectively 17, 23.4, 7.8 and 11.4 πa20. In the same way, for dissociative ionization towards X+n where X = P and As and n = 1, 2 and 3, these values are in the range 1.4-3.8 πa20 with an accuracy of about 16 % on the values of cross sections and of 0.5 eV on those of the energy. Results are discussed against electron energy and against formation processes

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