02408nas a2200289   4500008004100000022001400041245009300055210006900148260009200217300001200309490000800321520145200329653001801781653001501799653000801814653000901822653001401831653000801845653001601853653000801869100003001877700002001907700002201927700002001949700002601969856012301995       2006                        eng d  a1042-015000aIrradiation effects of 12 eV oxygen ions on polyimide and fluorinated ethylene propylene0 aIrradiation effects of 12 eV oxygen ions on polyimide and fluori  a4 PARK SQUARE, MILTON PARK, ABINGDON OX14 4RN, OXON, ENGLANDbTAYLOR & FRANCIS LTDcAUG  a495-5040 v1613 a<p>Polyimide (PI) and Fluorinated Ethylene Propylene (FEP) samples (15mm x 15mm x 50 mu m ) were exposed to atomic oxygen ions of average energy similar to 12 eV and flux similar to 5x10(13) ions cm(-2) s(-1) , produced in the Electron Cyclotron Resonance (ECR) plasma. The energy and the flux of the oxygen ions at different positions in the plasma were measured by a retarding field analyzer. The fluence of the oxygen ions was varied from sample to sample in the range of similar to 5x10(16) to 2x10(17) ions cm(-2) by changing the irradiation period. The pre- and the post-irradiated samples were characterized by the weight loss, Scanning Electron Microscopy (SEM), X-ray Photoelectron Spectroscopy (XPS), and Fourier Transform Infrared (FTIR) techniques. The weight of the PI and FEP samples decreased with increasing the ion fluence. However, the erosion yield for the PI is found to be higher, by almost a factor five, when compared with that of FEP. On the surface region of irradiated samples, the concentrations of the carbon, fluorine, and oxygen and their corresponding chemical bonds have changed appreciably. Moreover, blisters and nanoglobules were also observed even at a fluence of similar to 10(17) ions cm(-2) . This oxygen ion fluence is almost two orders of magnitude lower than that of the 5 eV atomic oxygen, which a satellite encounters in the space, at the low Earth orbit, during its mission period of about 7 years.</p>10aatomic oxygen10aECR plasma10aFEP10aFTIR10aPolyimide10aSEM10aweight loss10aXPS1 aMajeed, Riyadh, M A Abdul1 aPurohit, V., S.1 aBhoraskar, S., V.1 aMandale, A., B.1 aBhoraskar, Vasant, N.  uhttp://library.ncl.res.in/content/irradiation-effects-12-ev-oxygen-ions-polyimide-and-fluorinated-ethylene-propylene-0