Analysis of Nitrogen Defects in Diamond with VUV Photoluminescence

Abstract

Various diamonds were analyzed with photoluminescence (PL) spectra excited with synchrotron radiation in the wavelength range 160-250 nm. The emission of type IaAB diamond begins near 300 nm and extends to 700 nm; two broad lines with maximums about 419 and 469 nm correspond to energies 2.96 and 2.64 eV, respectively. The spectral features observed in the PL excitation spectra show two vibrational progressions, A and B, related to nitrogen defects in diamond. Progression A has a spacing 1266 ± 20 cm(-1) and is associated with the N2 (or A) center of a nitrogen defect, whereas progression B has a spacing 1177 ± 20 cm(-1) related to the N4 (or B) center of a nitrogen defect. These vibrational progressions in PL excitation spectra of N2 and N4 centers in type IaAB diamond are here identified for the first time. We suggest the use of PL spectra excited in the region 170-240 nm to analyze and to identify the type of diamond.

Far‐UV‐Excited Luminescence of Nitrogen‐Vacancy Centers: Evidence for Diamonds in Space

“…The low-temperature spectrum was obtained by cooling the samples with aclosed-cyclec ryostat system detailed inRef. [20].…”

“…We have recently demonstrated the detection of the PL of nitrogen aggregates in type-Ia diamond powders through excitation with radiation from asynchrotron source in the wavelength range of l = 125-300 nm. [20] Prominent luminescence derived from the above-band gap or interband excitation was observed over awavelength range of 300-600 nm. Recognizing that the synchrotron radiation is an ideal tool to address the aforementioned issues,weapplied it to NV with the aim of resolving the long-standing debate about the origin of ERE, an approach that has not been attempted previously for any model.…”

Molecular depth profiling

“…[13] After their efforts, our laboratory was able to produce Δ-layer structures of lipid bilayers of dimyristoyl phosphatidate embedded in another lipid, arachidic acid, using Langmuir-Blodgett techniques. [14] With these two systems, there has been an effort by many groups to elucidate the variables that influence depth resolution. Factors such as projectile kinetic energy, angle of incidence, reduction of topography by sample rotation, temperature, and the nature of the material itself have been extensively investigated.…”

Quantitative Analysis of Nitrogen Defect N4 in Diamond with Photoluminescence Excited in the 170–240 nm Region

“…[20][21][22][23][24][25] With the PL technique, our previous work still had limitations to achieve quantitative information. [18][19] In the present work, we investigated the quantitative analysis of nitrogen defect N4 in diamond detecting the PL excitation (PLE) at 236 nm, demonstrating that the sensitivity can attain a ppb level.…”

“…As diamond is the hardest natural material and can be dissolved intact in no solvent, these properties hinder its preparation for the measurement of absorption spectra, for which purpose a sample must typically be treated as a film, pellet or parallel disc. To solve 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 3 this problem, we applied photoluminescence (PL) for the analysis of various diamonds excited with radiation from a synchrotron source; [18][19] one can thereby analyze and identify the nitrogen defects in a diamond from its luminescence with excitation in the wavelength range 170-240 nm. The greatest advantage of this analytical technique is that a diamond sample remains intact and entirely undamaged during this PL analysis.…”