Influence of electron irradiation on the weight loss of a polymer composite and its contam-ination by gas release products of the optical glass surface

In our work, we present the results of computational and experimental studies of the deposition of gas release products and radiation sputtering of a polymer composite material on the surface of cover glass samples of solar cell elements of a spacecraft under electron irradiation. K-208 glass samples were exposed to electrons with an energy of 30 keV and volatile products released from the EKOM-1 material when heated or under the action of electrons. The average electron flux density was cm-2 s-1, and the pressure in the vacuum chamber did not exceed Pa. Contamination of glass surfaces was controlled by measuring the transmittance of glass samples. The measurements were carried out on a «Cary 500» double-beam spectrophotometer in the range from 200 to 3300 nm with a spectral resolution of 2 nm. The measurement results showed that the largest decrease in the spectral transmittance of glass samples occurred after the simultaneous exposure to electron radiation and molecular fluxes. It was founded experimentally that irradiation of glass with electrons leads to an increase in the rate of accumulation of gas release products on it. This is due to the electrification of glass, which stimulates the deposition of radiation-ionized drugs on it - products of gas release and sputtering of EKOM-1.