Modeling of the thermal migration mechanisms of atomic oxygen in Ar, Kr, and Xe crystals

2021 ◽  
Vol 154 (4) ◽  
pp. 044305
Author(s):  
Iosif V. Leibin ◽  
Inna S. Kalinina ◽  
Dmitry S. Bezrukov ◽  
Alexei A. Buchachenko
Keyword(s):  
Atomic Oxygen ◽  
Thermal Migration

Degradation Behaviour of C/C Composites by Atomic Oxygen Irradiation

2013 ◽  
Vol 28 (8) ◽  
pp. 853-858 ◽  
Author(s):  
Cong TIAN ◽  
Lai-Fei CHENG ◽  
Xin-Gang LUAN
Keyword(s):  
Atomic Oxygen ◽  
Degradation Behaviour

scholarly journals The Effect of Low Earth Orbit Atomic Oxygen Exposure on Phenylphosphine Oxide-Containing Polymers

2000 ◽  
Vol 12 (1) ◽  
pp. 43-52 ◽  
Author(s):  
John W Connell
Keyword(s):  
Thin Film ◽  
Atomic Oxygen ◽  
Low Earth Orbit ◽  
Space Environment ◽  
Earth Orbit ◽  
Cooperative Effort ◽  
Flight Experiment ◽  
Oxygen Exposure ◽  
Atomic Oxygen Exposure ◽  
Phenylphosphine Oxide

Thin films of phenylphosphine oxide-containing polymers were exposed to low Earth orbit aboard a space shuttle flight (STS-85) as part of flight experiment designated Evaluation of Space Environment and Effects on Materials (ESEM). This flight experiment was a cooperative effort between the NASA Langley Research Center (LaRC) and the National Space Development Agency of Japan (NASDA). The thin-film samples described herein were part of an atomic oxygen exposure (AOE) experiment and were exposed to primarily atomic oxygen (∼1×1019 atoms cm−2). The thin-film samples consisted of three phosphine oxide-containing polymers (arylene ether, benzimidazole and imide). Based on post-flight analyses using atomic force microscopy, x-ray photo-electron spectroscopy and weight loss data, it was found that the exposure of these materials to atomic oxygen (AO) produces a phosphorus oxide layer on the surface of the samples. Earlier work has shown that this layer provides a barrier towards further attack by AO. Consequently, these materials do not exhibit linear erosion rates which is in contrast with most organic polymers. Qualitatively, the results obtained from these analyses compare favourably with those obtained from samples exposed to AO and/or an oxygen plasma in ground-based exposure experiments. The results of the low Earth orbit AO exposure on these materials will be compared with those of ground-based exposure to AO.

High-Efficiency and Ground-State Atomic Oxygen-Dominant Photodegradation of Carbamazepine by Coupling Chlorine and g-C3N4

2021 ◽  
Vol 60 (5) ◽  
pp. 2112-2122
Author(s):  
Zhu Ren ◽  
Shuo Chen ◽  
Shun-Feng Jiang ◽  
Wei-Fei Hu ◽  
Hong Jiang
Keyword(s):  
Ground State ◽  
Atomic Oxygen ◽  
High Efficiency

scholarly journals The Influence of the Density of CNT Arrays on Their Atomic Oxygen Erosion Effects

2021 ◽  
Vol 1948 (1) ◽  
pp. 012209
Author(s):  
Man Li ◽  
Yuming Liu ◽  
Yu Li ◽  
Qiang Yu ◽  
Yongtai Zhang ◽  
...  
Keyword(s):  
Atomic Oxygen ◽  
Cnt Arrays ◽  
Atomic Oxygen Erosion

Recombination energy of atomic oxygen and related species at the mesopause

1994 ◽  
Vol 14 (9) ◽  
pp. 177-180 ◽  
Author(s):  
M. Riese ◽  
D. Offermann ◽  
G. Brasseur
Keyword(s):  
Related Species ◽  
Atomic Oxygen ◽  
Recombination Energy

scholarly journals Study of the Synchrotron Photoionization Oxidation of Alpha-Angelica Lactone (AAL) Initiated by O(3P) at 298, 550, and 700 K

Molecules ◽  
2021 ◽  
Vol 26 (13) ◽  
pp. 4070
Author(s):  
Golbon Rezaei ◽  
Giovanni Meloni
Keyword(s):  
Atomic Oxygen ◽  
Fossil Fuels ◽  
Reaction Products ◽  
Photoionization Mass Spectrometry ◽  
Natural Substances ◽  
Primary Products ◽  
Major Reaction ◽  
Angelica Lactone ◽  
Significant Attention

In recent years, biofuels have been receiving significant attention because of their potential for decreasing carbon emissions and providing a long-term renewable solution to unsustainable fossil fuels. Currently, lactones are some of the alternatives being produced. Many lactones occur in a range of natural substances and have many advantages over bioethanol. In this study, the oxidation of alpha-angelica lactone initiated by ground-state atomic oxygen, O(3P), was studied at 298, 550, and 700 K using synchrotron radiation coupled with multiplexed photoionization mass spectrometry at the Lawrence Berkeley National Lab (LBNL). Photoionization spectra and kinetic time traces were measured to identify the primary products. Ketene, acetaldehyde, methyl vinyl ketone, methylglyoxal, dimethyl glyoxal, and 5-methyl-2,4-furandione were characterized as major reaction products, with ketene being the most abundant at all three temperatures. Possible reaction pathways for the formation of the observed primary products were computed using the CBS–QB3 composite method.

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