Journal ArticleDOI
Graphitization of amorphous diamondlike carbon films by ion bombardment
TLDR
Amorphous hydrogenated carbon films prepared by glow discharge decomposition of CH4 at a power density of 0.4 W cm−2 were bombarded with hydrogen and nitrogen ions of energies between 100 and 600 keV, and structural changes due to various ion doses were analyzed using Raman, photoluminescence, and infrared spectroscopy as mentioned in this paper.Abstract:
Amorphous hydrogenated carbon films prepared by glow discharge decomposition of CH4 at a power density of 0.4 W cm−2 were bombarded with hydrogen and nitrogen ions of energies between 100 and 600 keV. The structural changes due to various ion doses were analyzed using Raman, photoluminescence, and infrared spectroscopy. Nitrogen bombardment produces essentially a hydrogen depletion in the whole dose interval as shown by the IR spectra; as a consequence there is a drop of several orders of magnitude in the integrated photoluminescence intensity, and carbon–carbon double bonds, characteristic of a graphiticlike structure, appear in the Raman spectra. The same general effects are produced under proton bombardment, but their intensities change more gradually with the ion dose, in agreement with a vacancy production mechanism.read more
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Ion-beam-induced hydrogen release from a-C:H: A bulk molecular recombination model
TL;DR: In this paper, the authors used a statistical model based on bulk molecular recombination to analyze the hydrogen release from a C:H induced by ion irradiation and obtained good fits for all available data by adjusting a single parameter which is correlated to the stopping power of the projectile in the material.
Journal ArticleDOI
The effects of ion irradiation on the evolution of the carrier of the 3.4 micron interstellar absorption band
TL;DR: In this article, the effects of ion bombardment on nano-size hydrogenated carbon grains with different hydrogen content were investigated using infrared and Raman spectroscopy, and it was shown that in dense cloud regions, cosmic-ray bombardment is the most significant C”H bond destruction mechanism.
Journal ArticleDOI
Ion irradiation of carbonaceous interstellar analogues - Effects of cosmic rays on the 3.4 μm interstellar absorption band
M. Godard,Géraldine Féraud,Marin Chabot,Y. Carpentier,Thomas Pino,Rosario Brunetto,Jean Duprat,Cecile Engrand,Philippe Bréchignac,Louis D'Hendecourt,Emmanuel Dartois +10 more
TL;DR: In this article, the effects of cosmic rays on the aliphatic C-H stretching modes of hydrogenated amorphous carbons (a-C:H) were investigated with IR spectroscopy.
Journal ArticleDOI
Raman spectroscopic investigation of ion-beam-irradiated glassy carbon
TL;DR: In this article, the authors used Raman spectroscopy to monitor the changes induced in glassy carbon as a result of irradiation with H, He, C, N, Si, and Xe ions.
Journal ArticleDOI
Isotopic Exchange in Hard Amorphous Carbonized Layers
TL;DR: In this paper, the H/D exchange process was studied as a function of the bombardment fluence by means of depth profile measurements, showing that the local hydrogen and deuterium contents are not adding up to a constant "saturation" value: the local mixing model is not valid.