Additional Absorption and PL Spectroscopy. Ultraviolet/visible/near-infrared (UV-Vis-NIR), Fourier-transform infrared (FTIR), and photoluminescence (PL) spectra were collected to complement the fluorescence data, providing additional detail about the defects under more readily measurable conditions (again, see figure 3). UV-Vis-NIR spectra were collected with an Ocean Optics integrating sphere and HR 4000 CCD spectrometer over the 380–1000 nm range (~1 nm resolution) at ~77K temperature. FTIR spectra (not shown) were collected to identify diamond type using a Thermo Nexus 6700 FTIR spectrometer (6000–400 cm–1, 1 cm–1 resolution, 128 scans, room temperature). Breeding and Shigley (2009) describes diamond type and its use in gemology. Photoluminescence spectra were collected using a Renishaw inVia Raman microscope (325, 488, 514, 633, and 830 nm laser excitations, various scan ranges, and ~77K temperature).
Additional Absorption and PL Spectroscopy. Ultraviolet/visible/near-infrared (UV-Vis-NIR), Fourier-transform infrared (FTIR), and photoluminescence (PL) spectra were collected to complement the fluorescence data, providing additional detail about the defects under more readily measurable conditions (again, see figure 3). UV-Vis-NIR spectra were collected with an Ocean Optics integrating sphere and HR 4000 CCD spectrometer over the 380–1000 nm range (~1 nm resolution) at ~77K temperature. FTIR spectra (not shown) were collected to identify diamond type using a Thermo Nexus 6700 FTIR spectrometer (6000–400 cm–1, 1 cm–1 resolution, 128 scans, room temperature). Breeding and Shigley (2009) describes diamond type and its use in gemology. Photoluminescence spectra were collected using a Renishaw inVia Raman microscope (325, 488, 514, 633, and 830 nm laser excitations, various scan ranges, and ~77K temperature).
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