Investigations into Synergistic Effects of Atomic Oxygen and Vacuum Ultraviolet

2009 ◽  
Vol 46 (2) ◽  
pp. 241-247 ◽  
Author(s):  
Hiroyuki Shimamura ◽  
Eiji Miyazaki
Keyword(s):  
Atomic Oxygen ◽  
Vacuum Ultraviolet ◽  
Synergistic Effects

Mechanistic Studies of Atomic Oxygen Reactions with Polymers and Combined Effects with Vacuum Ultraviolet Light

MRS Bulletin ◽  
2010 ◽  
Vol 35 (1) ◽  
pp. 35-40 ◽  
Author(s):  
Masahito Tagawa ◽  
Timothy K. Minton
Keyword(s):  
Atomic Oxygen ◽  
Vacuum Ultraviolet ◽  
Uv Light ◽  
Synergistic Effects ◽  
Low Earth Orbit ◽  
Point Of View ◽  
Experimental Results ◽  
Space Environment ◽  
Combined Effects ◽  
The Individual

AbstractThis article focuses on mechanistic aspects of hyperthermal atomic oxygen reactions with polymers, which are the major contributor to material degradation in low Earth orbit. Due to the importance of well-controlled experiments in the understanding of the reaction mechanisms, ground-based experimental results obtained by a hyperthermal atomic oxygen beam generated by laser detonation facilities are mainly surveyed. Combined effects of atomic oxygen and vacuum ultraviolet (VUV) light on fluorinated polymers are also described. Such combined effects of hyperthermal atomic oxygen and VUV light are important not only from a fundamental point of view but also for engineering purposes (i.e., methodology for ground-based space environmental simulation). The VUV-sensitive polymers, poly(methyl methacrylate), and Teflon fluorinated ethylene-propylene do not show significant synergistic effects. Instead, the effect of combining atomic oxygen and VUV light produces erosion of the polymer that is the sum of the erosion caused by atomic oxygen and UV light acting individually. The experimental results suggest that material erosion in a complicated space environment may be quantitatively predicted if the erosion yields caused by the individual action of atomic oxygen and VUV light are known.

Vacuum Ultraviolet/Atomic Oxygen Erosion Resistance of Amorphous Si0.26C0.43N0.31 Coating

2011 ◽  
Vol 48 (3) ◽  
pp. 507-512 ◽  
Author(s):  
L. F. Hu ◽  
M. S. Li ◽  
J. J. Xu ◽  
Ziqi Sun ◽  
Y. C. Zhou
Keyword(s):  
Atomic Oxygen ◽  
Vacuum Ultraviolet ◽  
Erosion Resistance ◽  
Atomic Oxygen Erosion

Investigations of oxysilanes from the crossed-beam reaction of atomic oxygen with silane using tunable vacuum-ultraviolet ionization

2007 ◽  
Vol 444 (4-6) ◽  
pp. 237-241 ◽  
Author(s):  
Chanchal Chaudhuri ◽  
I-Chung Lu ◽  
Jim J. Lin ◽  
Shih-Huang Lee
Keyword(s):  
Atomic Oxygen ◽  
Vacuum Ultraviolet

Synergistic effects of vacuum ultraviolet radiation, ion bombardment, and heating in 193nm photoresist roughening and degradation

2008 ◽  
Vol 92 (15) ◽  
pp. 153113 ◽  
Author(s):  
D. Nest ◽  
D. B. Graves ◽  
S. Engelmann ◽  
R. L. Bruce ◽  
F. Weilnboeck ◽  
...  
Keyword(s):  
Ultraviolet Radiation ◽  
Vacuum Ultraviolet ◽  
Synergistic Effects ◽  
Ion Bombardment ◽  
Vacuum Ultraviolet Radiation

Vacuum ultraviolet radiation/atomic oxygen synergism in fluorinated ethylene propylene Teflon erosion

1992 ◽  
Vol 29 (1) ◽  
pp. 150-151 ◽  
Author(s):  
A. E. Stiegman ◽  
David E. Brinza ◽  
Eric G. Laue ◽  
Mark S. Andersen ◽  
Ranty H. Liang
Keyword(s):  
Ultraviolet Radiation ◽  
Atomic Oxygen ◽  
Vacuum Ultraviolet ◽  
Ethylene Propylene ◽  
Vacuum Ultraviolet Radiation ◽  
Fluorinated Ethylene Propylene

scholarly journals Simulation of the interaction of spacecraft with the rarefied ionospheric plasma

2021 ◽  
Vol 2021 (2) ◽  
pp. 36-45
Author(s):  
V.A. Shuvalov ◽  
◽  
Yu.P. Kuchugurnyi ◽  
M.I. Pysmennyi ◽  
S.M. Kulahin ◽  
...  
Keyword(s):  
Ultraviolet Radiation ◽  
Atomic Oxygen ◽  
Ionospheric Plasma ◽  
Vacuum Ultraviolet ◽  
Polymer Materials ◽  
Plasma Flows ◽  
Vacuum Ultraviolet Radiation ◽  
Probe Diagnostics ◽  
Magnetohydrodynamic Interaction

Principles of simulation of the physical-chemical and electromagnetic interaction of a spacecraft with the near-satellite environment and principles of probe diagnostics of rarefied plasma flows onboard a spacecraft are stated. Equivalence criteria are formulated for the interaction of a spacecraft with the near-satellite environment and hypersonic rarefied plasma flows on dedicated setups, in particular on the plasmaelectrodynamic setup of the Institute of Technical Mechanics of the National Academy of Sciences of Ukraine and the State Space Agency of Ukraine, which has the status of the National Patrimony of Ukraine. The features of spacecraft interaction with the near-satellite environment were studied along the following three lines: - degradation of the materials and performance characteristics of spacecraft components in a long-term orbital service: - magnetohydrodynamic interaction of a spacecraft with hypersonic rarefied plasma flows; - probe diagnostic of rarefied plasma flows onboard a spacecraft. Along the first line, a calculation-and-experiment procedure was developed to evaluate the power decrease of spacecraft silicon solar batteries under long-term (~ 10 years) exposure to the space factors and the near-satellite environment in circular orbits. Principles of accelerated life tests for the resistance of spacecraft polymer materials to long-term exposure to atomic oxygen flows and vacuum ultraviolet radiation were developed. Simultaneous exposure of polymers to atomic oxygen and vacuum ultraviolet radiation results in the synergic effect of mass loss by materials that contain a monomer of the (CH)n group. Along the second line, models were formulated for magnetohydrodynamic interaction in the magnetized spacecraft – ionospheric plasma system. It was shown that the interaction of a ?0,8 – 1.5 T magnetic field of a space debris object (in particular, a spent spacecraft) with the ionospheric plasma produces an electromagnetic drag force sufficient for removing it to a low orbit followed by its burn-up in the dense atmosphere. Along the third line, procedures were developed for ionospheric plasma probe diagnostics using onboard instrumentation that includes mutually orthogonal cylindrical electrical probes and a two-channel neutral-particle detector. It was shown that this instrumentation with the use of proprietary output signal interpretation algorithms and procedures allows one to locate sources of space-time disturbances in inospheric plasma parameters caused by natural and technogeneous catastrophic phenomena on the subsatellite track.

Vacuum‐Ultraviolet Chemiluminescence from Atomic Oxygen and Acetylene

1965 ◽  
Vol 42 (4) ◽  
pp. 1463-1464 ◽  
Author(s):  
N. Jonathan ◽  
F. F. Marmo ◽  
J. P. Padur
Keyword(s):  
Atomic Oxygen ◽  
Vacuum Ultraviolet
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