Cathodoluminescence, Absorption And Raman Spectra Of Individual Particles And Polished Films Of Vapor Deposited Diamond

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Abstract
Cathodoluminescence, absorption and Raman spectra of diamond particles and polycrystalline films prepared by a microwave plasma method from gaseous mixtures of methane and hydrogen have been studied. The results are discussed in relation to the effect of the methane concentration on the optical properties of the diamond material produced. Absorption edge at 5.5eV was observed for the polished film prepared at 0.3% methane concentration, and for particles prepared at 1% methane concentration containing water vapor. Edge emission in the cathodoluminescence spectra was observed for particles obtained at methane concentrations from 0.5 to 2%, while the emission was not observed in the films obtained at the same conditions. The edge emission became weaker with increasing methane concentration. The results indicate that the particles prepared at lower methane concentrations are high quality diamond similar to type IIa diamond, the purest form of natural diamond, while the films are heavily strained.

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