Surface effects of satellite material outgassing products

Abstract : Optical property measurements of condensed contaminant films on cryogenically cooled substrates were completed for 18 additional materials to those reported in AEDC-TR-87-8, 'Surface Effects of Satellite Outgassing Products'. The materials studied were either being considered for use in space or in ground test chambers at Arnold Engineering Development Center (AEDC). Infrared spectral transmittance measurements were made for thin films of contaminant deposited on a 77 K germanium window under vacuum conditions (. 000001 torr). Material temperatures were controlled at 125 C for 24 hr to provide the outgassing source. The objective of this report is to present the refractive (n) and absorptive (k) indices of the condensed outgassing products of satellite materials which have been determined from the experimental measurements of the infrared transmittance spectra.