Abstract
Pressure dependence of vibronic photoluminescence spectra for two types of color centers in diamond: the nitrogen-vacancy `NV' center and the nitrogen-vacancy-nitrogen `H3' center are studied at 77K. By analyzing the spectra, the strength of the electron-lattice interaction, the local vibrational energies, and the energies of the zero-phonon line (ZPL) are determined as a function of pressure. The lattice vibration accompanied by the H3 center shows softening due to pressure. The distribution range of the internal strain which acts as the origin of the inhomogeneous broadening of ZPL is estimated.
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