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.

Chem. Phys. Lett.

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.