Photonics in Extreme Environments: High Energy Radiation-Induced Optical Response in Silicon Waveguides

2021 ◽  
Author(s):  
Landen D. Ryder ◽  
Robert A. Reed ◽  
Sharon M. Weiss
Keyword(s):  
Extreme Environments ◽  
Optical Response ◽  
High Energy ◽  
High Energy Radiation ◽  
Energy Radiation ◽  
Silicon Waveguides ◽  
Radiation Induced

High energy radiation induced degradation of reactive yellow 145 dye: A mechanistic study

2020 ◽  
Vol 177 ◽  
pp. 109115
Author(s):  
Majid Muneer ◽  
Muhammad Imran Kanjal ◽  
Muhammad Saeed ◽  
Tariq Javed ◽  
Atta Ul Haq ◽  
...  
Keyword(s):  
High Energy ◽  
Mechanistic Study ◽  
High Energy Radiation ◽  
Energy Radiation ◽  
Radiation Induced

High-Energy Radiation-Induced Changes in the Crystal Morphology of Cellulose

2004 ◽  
Vol 37 (7) ◽  
pp. 2668-2670 ◽  
Author(s):  
Frederick G. Morin ◽  
Byron D. Jordan ◽  
Robert H. Marchessault
Keyword(s):  
Crystal Morphology ◽  
High Energy ◽  
High Energy Radiation ◽  
Energy Radiation ◽  
Radiation Induced ◽  
Induced Changes

Radiation-induced racemization and amplification of chirality: implications for comets and meteorites

2007 ◽  
Vol 6 (1) ◽  
pp. 1-10 ◽  
Author(s):  
Franco Cataldo
Keyword(s):  
Cosmic Rays ◽  
Radiation Dose ◽  
Optical Activity ◽  
High Energy ◽  
Chiral Molecules ◽  
Radiation Processing ◽  
High Energy Radiation ◽  
Energy Radiation ◽  
Naturally Occurring ◽  
Radiation Induced

The action of high-energy radiation on prebiotic chiral molecules plays against the preservation of chirality. Chiral molecules incorporated in comets and meteorites are bombarded for billions of years by cosmic rays and by the high-energy radiation due to the decay of naturally occurring radionuclides. The action of cosmic rays on the surface of comets and meteorites causes the complete radiation processing of the surface of these bodies, but at depths of 20 m or so the cosmic rays are completely shielded and the radiation should derive only from the decay of radionuclides. In 4.6×109 yr the radiation dose supplied by the radionuclide decay to the organic molecules present inside the cometary or meteoritic body is equivalent to 14000 kGy. Our studies on the radiolysis of a series of naturally occurring chiral molecules, the terpenes, have shown that although all undergo the radioracemization reaction, the extent of radioracemization is such that a significant fraction of chiral excess and chiral molecules can survive a radiation dose equivalent to 14000 kGy. A unique exception is represented by the terpene β-(−)-pinene which, instead of the expected radioracemization reaction, undergoes a radiation-induced polymerization. The resulting poly-β-pinene, having an highly ordered supramolecular structure, displays an optical activity which is 1.7 times higher than the starting monomer. Thus, in this specific case, the optical activity is not reduced but enhanced by the action of radiation and remains locked into a polymer which displays a considerable radiation resistance and may act as a chiral template and as a chiral surface for prebiotic chemistry.

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