In order to prove the triboplasma generation in the vicinity of the sliding contact under oil lubrication, two-dimensional images and energy spectra of the photons emitted from the sliding contact has been investigated under perfluoropolyether (PFPE) oil lubrication in a tribosystem of a diamond pin sliding on a sapphire disk in the atmospheric ambient air pressure and in vacuum. Two-dimensional image of the tribophoton clearly showed the plasma generation under PFPE oil lubrication. The UV photon energy spectrum and disappearance of the UV photon image in vacuum showed that the plasma is generated by air discharge even under oil lubrication.

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