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Window contamination on Expose-R

Published online by Cambridge University Press:  18 November 2014

R. Demets*
Affiliation:
ESTEC, Keplerlaan 1, 2201AZ, Noordwijk, The Netherlands
M. Bertrand
Affiliation:
CNRS, CBM, UPR 4301, rue Charles Sadron, F-45071 Orléans, France
A. Bolkhovitinov
Affiliation:
ESTEC, Keplerlaan 1, 2201AZ, Noordwijk, The Netherlands
K. Bryson
Affiliation:
Bay Area Environmental Research Institute, 560 Third St West, Sonoma, CA 95476, USA Space Science and Astrobiology Division, NASA Ames Research Center, Moffett Field, CA 94035, USA
C. Colas
Affiliation:
Université Orléans, CNRS, ICOA, UMR 7311, rue de Chartres, F-45067 Orléans, France
H. Cottin
Affiliation:
Laboratoire Interuniversitaire des Systèmes Atmosphériques (LISA), Université Paris Est – Créteil (UPEC), Université Paris Diderot (UPD), UMR 7583 CNRS, 61 Avenue du Général de Gaulle, 94010 Créteil, France
J. Dettmann
Affiliation:
ESTEC, Keplerlaan 1, 2201AZ, Noordwijk, The Netherlands
P. Ehrenfreund
Affiliation:
Leiden Observatory, Leiden University, Einsteinweg 55, 2333CC Leiden, The Netherlands
A. Elsaesser
Affiliation:
Leiden Observatory, Leiden University, Einsteinweg 55, 2333CC Leiden, The Netherlands
E. Jaramillo
Affiliation:
RUAG Schweiz AG, Schaffhauserstrasse 580, 8052 Zürich – Seebach, Switzerland
M. Lebert
Affiliation:
Lehrstuhl für Zellbiologie, Friedrich-Alexander-Universität, Staudtstraße 5, D-91058 Erlangen, Germany
G. van Papendrecht
Affiliation:
ESTEC, Keplerlaan 1, 2201AZ, Noordwijk, The Netherlands
C. Pereira
Affiliation:
RUAG Schweiz AG, Schaffhauserstrasse 580, 8052 Zürich – Seebach, Switzerland
T. Rohr
Affiliation:
ESTEC, Keplerlaan 1, 2201AZ, Noordwijk, The Netherlands
K. Saiagh
Affiliation:
Laboratoire Interuniversitaire des Systèmes Atmosphériques (LISA), Université Paris Est – Créteil (UPEC), Université Paris Diderot (UPD), UMR 7583 CNRS, 61 Avenue du Général de Gaulle, 94010 Créteil, France
M. Schuster
Affiliation:
Lehrstuhl für Zellbiologie, Friedrich-Alexander-Universität, Staudtstraße 5, D-91058 Erlangen, Germany

Abstract

Expose is a multi-user instrument for astrobiological and astrochemical experiments in space. Installed at the outer surface of the International Space Station, it enables investigators to study the impact of the open space environment on biological and biochemical test samples. Two Expose missions have been completed so far, designated as Expose-E (Rabbow et al. 2012) and Expose-R (Rabbow et al. this issue). One of the space-unique environmental factors offered by Expose is full-spectrum, ultraviolet (UV)-rich electromagnetic radiation from the Sun. This paper describes and analyses how on Expose-R, access of the test samples to Solar radiation degraded during space exposure in an unpredicted way. Several windows in front of the Sun-exposed test samples acquired a brown shade, resulting in a reduced transparency in visible light, UV and vacuum UV (VUV). Post-flight investigations revealed the discolouration to be caused by a homogenous film of cross-linked organic polymers at the inside of the windows. The chemical signature varied per sample carrier. No such films were found on windows from sealed, pressurized compartments, or on windows that had been kept out of the Sun. This suggests that volatile compounds originating from the interior of the Expose facility were cross-linked and photo-fixed by Solar irradiation at the rear side of the windows. The origin of the volatiles was not fully identified; most probably there was a variety of sources involved including the biological test samples, adhesives, plastics and printed circuit boards. The outer surface of the windows (pointing into space) was chemically impacted as well, with a probable effect on the transparency in VUV. The reported analysis of the window contamination on Expose-R is expected to help the interpretation of the scientific results and offers possibilities to mitigate this problem on future missions – in particular Expose-R2, the direct successor of Expose-R.

Type
Research Article
Copyright
Copyright © Cambridge University Press 2014 

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References

REFERENCES

Note: Several of the references below are not scientific publications but technical documents that were published to support the Expose project. They can be requested from the corresponding author.Google Scholar
Beuselinck, T. & Van Bavinchove, C. (2011a). Expose: Environmental history by calculation: Expose-E Simulation Results. RedShift Design and Engineering BVBA, EXP-RP-017-RS, Issue A, Rev. 2, 6 May 2011.Google Scholar
Beuselinck, T. & Van Bavinchove, C. (2011b). Expose: Environmental history by calculation. Expose-R simulation results. RedShift Design and Engineering BVBA, EXP-RP-020-RS, Issue A, Rev. 1, 23 December 2011.Google Scholar
Butenko, Y. (2012). Raman spectroscopy and optical post-flight inspection of the window Suprasil 8, Expose R. Materials Report nr. 6754. ESTEC (TEC-QTE), 20 January 2012.Google Scholar
Dachev, T., Horneck, G., Häder, D-P., Schuster, M. & Lebert, M. (2014). EXPOSE-R Cosmic Radiation Time Profile. Int. J. Astrobiol. (this issue), published online: 12 05 2014 , Doi: http://dx.doi.org/10.1017/S1473550414000093 Google Scholar
ESA-ESTEC (2004). RTV-S 691. In Space product Assurance. Data for selection of space materials and processes. ECSS-Q-70–71A Rev. 1, p. 142. ESA Publication Division, 18 June 2004.Google Scholar
Lee Smith, A. (1960). Infrared spectra-structure correlations for organosilicon compounds. Spectrochim. Acta 16(1–2), 87105.Google Scholar
Novikova, N., Deshevaya, E., Levinskikh, M., Polikarpov, N., Poddubko, S. & Sychev, V. (2014). Study of the effects of the space environment on dormant forms of biological specimens. Int. J. Astrobiol. (this issue).Google Scholar
Rabbow, E. et al. (2012). EXPOSE-E: an ESA Astrobiology Mission 1.5 Years in Space. Astrobiology 2(5), 374386.Google Scholar
Rabbow, E. et al. (2014). The Astrobiological Mission EXPOSE-R on board of the International Space Station. Int. J. Astrobiol. (this issue), published online: 28 08 2014 , doi: http://dx.doi.org/10.1017/S1473550414000202 Google Scholar
Romanenko, E.A. & Tkachuk, B.V. (1973). Infrared spectra and structure of thin polydimethylsiloxane films. J. Appl. Spectrosc. 18, 188192.CrossRefGoogle Scholar
RUAG (2011a). EXPOSE-R. Post-flight De-integration and Inspection, RUAG EXR-TN-HT-017, Issue 1, 14 April 2011.Google Scholar
RUAG (2011b). EXPOSE-R. Post-flight Inspection of Windows, RUAG EXR-TR-HT-010, Issue 2, 21 July 2011.Google Scholar
Tighe, A.P., Iwanovsky, B., van Eesbeek, M. & Duzellier, S. (2009). In-orbit measurements of the Columbus lab vacuum environment using the MEDET pressure gauge. In ISMSE-11, Int. Symp. on Materials in Space Environment, Aix-en-Provence, France, September 2009.Google Scholar
van Papendrecht, G., Butenko, Y., Bolkhovitinov, A., Demets, R., Rohr, T. & Semprimoschnig, C. (2013). Molecular contamination effects on the sample compartments of the Expose-E and -R flight experiments (ISMSE-12). In ESTEC (TEC-QTE), Proc. 12th Int. Symp. on Materials in Space Environment, Noordwijk, The Netherlands. ESA SP-705, February 2013.Google Scholar