Positive and negative ion ejection in the mass range below 200 Dalton is observed for perfluorinated poly-ether surfaces subjected to electron- and ion-beam irradiation. The exciting projectiles are Ar+ ions of 300 and 4000 eV and electrons of 3000 eV. The main positive ions found are fragments of CF3+ ions. Larger ions are found with lower probability. The main negative ion observed is F. The results show that the liquid-vacuum interface is formed by CF3 groups from the polymer.

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Journal Chem. Phys. Lett.
Citation
Lourenço, J. M. C, Carrapa, R. T, Teodoro, O. M. N. D, Moutinho, M. C, Gleeson, M. A, Los, J. H, & Kleyn, A.W. (2001). Positive and negative ion emission from perfluorinated poly-ethers. Chem. Phys. Lett., 336, 431–438.