title: Quantitative analysis of nitrogen defect N4 in diamond with photoluminescence excited in the 170-240 nm region.
abstract: Upon excitation at 170-240 nm, diamonds emit strong luminescence in wavelength range of 300-700 nm. The spectral features observed in the photoluminescence excitation (PLE) spectra show two vibrational progressions, A and B, related to nitrogen defects N2 and N4, respectively. We used PLE spectra excited in region 170-240 nm to identify the type of diamond and demonstrate quantitative analysis of the B center as a N4 nitrogen defect in diamonds; the least detectable concentration of the N4 nitrogen defect is about 13 ppb, and the sensitivity of PLE is about 30 times than that practicable with infrared absorption spectra.
authors.affiliation: National Synchrotron Radiation Research Center , No. 101, Hsin-Ann Road, Hsinchu Science Park, Hsinchu 30076, Taiwan.
authors.forename: Hsiao-Chi
authors.initials: HC
authors.lastname: Lu
authors.forename: Meng-Yeh
authors.initials: MY
authors.lastname: Lin
authors.forename: Yu-Chain
authors.initials: YC
authors.lastname: Peng
authors.forename: Jen-Iu
authors.initials: JI
authors.lastname: Lo
authors.forename: Sheng-Lung
authors.initials: SL
authors.lastname: Chou
authors.forename: Bing-Ming
authors.initials: BM
authors.lastname: Cheng