TY - JOUR
T1 - Fluence-Dependent Evolution of Paramagnetic Triplet Centers in e-Beam Irradiated Microcrystalline Ib Type HPHT Diamond
AU - Shames, Alexander I.
AU - Smirnov, Alex I.
AU - Milikisiyants, Sergey
AU - Danilov, Evgeny O.
AU - Nunn, Nicholas
AU - McGuire, Gary
AU - Torelli, Marco D.
AU - Shenderova, Olga
N1 - Funding Information:
The work has been funded in part by the NHLBI, Department of Health and Human Services, under Contract No. HHSN268201500010C. Time-domain EPR measurements and data modelling were carried out with support of U.S. DOE Contract DE-FG02-02ER15354 to A.I.Sm. EPR instrumentation at NCSU was supported by grants from the National Institutes of Health (No. RR023614), the National Science Foundation (No. CHE-0840501), and NCBC (No. 2009-IDG-1015). The authors are thankful to Dr. Mark J. Nilges (University of Illinois at Urbana−Champaign, IL) for a loan of a Metrolab 1062-2 probe.
Publisher Copyright:
© 2017 American Chemical Society.
PY - 2017/10/12
Y1 - 2017/10/12
N2 - 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.
AB - 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.
UR - http://www.scopus.com/inward/record.url?scp=85031327261&partnerID=8YFLogxK
U2 - 10.1021/acs.jpcc.7b06514
DO - 10.1021/acs.jpcc.7b06514
M3 - Article
AN - SCOPUS:85031327261
SN - 1932-7447
VL - 121
SP - 22335
EP - 22346
JO - Journal of Physical Chemistry C
JF - Journal of Physical Chemistry C
IS - 40
ER -