Fluence-Dependent Evolution of Paramagnetic Triplet Centers in e-Beam Irradiated Microcrystalline Ib Type HPHT Diamond

Alexander I. Shames, Alex I. Smirnov, Sergey Milikisiyants, Evgeny O. Danilov, Nicholas Nunn, Gary McGuire, Marco D. Torelli, Olga Shenderova

Research output: Contribution to journalArticlepeer-review

18 Scopus citations

Abstract

Paramagnetic triplet centers produced by e-beam irradiation of synthetic microcrystalline Ib-type high-pressure high-temperature (HPHT) diamonds were studied by continuous wave (CW) electron paramagnetic resonance (EPR) spectroscopy at X-band (9.4 GHz), pulsed EPR at X- and Q-bands (34 GHz), and fluorescence spectroscopies as a function of radiation fluences up to 5 × 1019 e-/cm2. EPR spectra of mostly "forbidden" Δms = 2 electronic spin transitions observed at g ≈ 4 (i.e., so-called half-field EPR spectra) reveal the presence of the main W15 triplet defects associated with the fluorescent negatively charged nitrogen-vacancy (NV-) centers as well as additional triplet spin centers identified as W16, W17, W18, and W33 that appear upon increasing the e-beam fluence. Consequent annealing at 1,400 °C significantly reduces the content of W17, W18, and W33 but not W15 and W16 defects. The efficacy of NV- center fabrication as a function of fluence dependent e-beam irradiation is also reported.

Original languageEnglish
Pages (from-to)22335-22346
Number of pages12
JournalJournal of Physical Chemistry C
Volume121
Issue number40
DOIs
StatePublished - 12 Oct 2017

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