Investigation of lattice impurities and photochromic centres in diamond with high resolution positron annihilation spectroscopy

R. W.N. Nilen; S. H. Connell; D. T. Britton; C. G. Fischer; E. J. Sendezera; P. Schaaff; J. P.F. Sellschop

doi:10.1016/S0925-9635(97)00139-8

Investigation of lattice impurities and photochromic centres in diamond with high resolution positron annihilation spectroscopy

R. W.N. Nilen, S. H. Connell, D. T. Britton, C. G. Fischer, E. J. Sendezera, P. Schaaff, J. P.F. Sellschop

Research output: Contribution to journal › Article › peer-review

4 Citations (Scopus)

Abstract

Thermalized positrons in solids annihilate with core and valence electrons after the formation of well-defined configurations which represent delocalized or trapped positron states. A two-dimensional coincidence measurement of the Doppler broadening of the electron-positron annihilation quanta allows the measurement of the longitudinal component of the momentum distribution profile out to 20 keV c^-1, with high sensitivity and improved resolution. Positron annihilation with core electrons can thus be observed, allowing the identification of lattice defects and impurities. We report on two-dimensional Doppler broadening measurements performed on synthetic and natural diamond. The results are consistent with positron annihilation at nitrogen-related defects in the synthetic diamond and positron trapping at photochromic centres in the natural diamond.

Original language	English
Pages (from-to)	1777-1783
Number of pages	7
Journal	Diamond and Related Materials
Volume	6
Issue number	12
DOIs	https://doi.org/10.1016/S0925-9635(97)00139-8
Publication status	Published - Dec 1997
Externally published	Yes

Keywords

Bulk diamond
Defect
Nitrogen
Positron Spectroscopy

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
General Chemistry
Mechanical Engineering
Materials Chemistry
Electrical and Electronic Engineering

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10.1016/S0925-9635(97)00139-8

Cite this

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title = "Investigation of lattice impurities and photochromic centres in diamond with high resolution positron annihilation spectroscopy",

abstract = "Thermalized positrons in solids annihilate with core and valence electrons after the formation of well-defined configurations which represent delocalized or trapped positron states. A two-dimensional coincidence measurement of the Doppler broadening of the electron-positron annihilation quanta allows the measurement of the longitudinal component of the momentum distribution profile out to 20 keV c-1, with high sensitivity and improved resolution. Positron annihilation with core electrons can thus be observed, allowing the identification of lattice defects and impurities. We report on two-dimensional Doppler broadening measurements performed on synthetic and natural diamond. The results are consistent with positron annihilation at nitrogen-related defects in the synthetic diamond and positron trapping at photochromic centres in the natural diamond.",

keywords = "Bulk diamond, Defect, Nitrogen, Positron Spectroscopy",

author = "Nilen, {R. W.N.} and Connell, {S. H.} and Britton, {D. T.} and Fischer, {C. G.} and Sendezera, {E. J.} and P. Schaaff and Sellschop, {J. P.F.}",

year = "1997",

month = dec,

doi = "10.1016/S0925-9635(97)00139-8",

language = "English",

volume = "6",

pages = "1777--1783",

journal = "Diamond and Related Materials",

issn = "0925-9635",

publisher = "Elsevier B.V.",

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TY - JOUR

T1 - Investigation of lattice impurities and photochromic centres in diamond with high resolution positron annihilation spectroscopy

AU - Nilen, R. W.N.

AU - Connell, S. H.

AU - Britton, D. T.

AU - Fischer, C. G.

AU - Sendezera, E. J.

AU - Schaaff, P.

AU - Sellschop, J. P.F.

PY - 1997/12

Y1 - 1997/12

N2 - Thermalized positrons in solids annihilate with core and valence electrons after the formation of well-defined configurations which represent delocalized or trapped positron states. A two-dimensional coincidence measurement of the Doppler broadening of the electron-positron annihilation quanta allows the measurement of the longitudinal component of the momentum distribution profile out to 20 keV c-1, with high sensitivity and improved resolution. Positron annihilation with core electrons can thus be observed, allowing the identification of lattice defects and impurities. We report on two-dimensional Doppler broadening measurements performed on synthetic and natural diamond. The results are consistent with positron annihilation at nitrogen-related defects in the synthetic diamond and positron trapping at photochromic centres in the natural diamond.

AB - Thermalized positrons in solids annihilate with core and valence electrons after the formation of well-defined configurations which represent delocalized or trapped positron states. A two-dimensional coincidence measurement of the Doppler broadening of the electron-positron annihilation quanta allows the measurement of the longitudinal component of the momentum distribution profile out to 20 keV c-1, with high sensitivity and improved resolution. Positron annihilation with core electrons can thus be observed, allowing the identification of lattice defects and impurities. We report on two-dimensional Doppler broadening measurements performed on synthetic and natural diamond. The results are consistent with positron annihilation at nitrogen-related defects in the synthetic diamond and positron trapping at photochromic centres in the natural diamond.

KW - Bulk diamond

KW - Defect

KW - Nitrogen

KW - Positron Spectroscopy

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U2 - 10.1016/S0925-9635(97)00139-8

DO - 10.1016/S0925-9635(97)00139-8

M3 - Article

AN - SCOPUS:0042722347

SN - 0925-9635

VL - 6

SP - 1777

EP - 1783

JO - Diamond and Related Materials

JF - Diamond and Related Materials

IS - 12

ER -

Investigation of lattice impurities and photochromic centres in diamond with high resolution positron annihilation spectroscopy

Abstract

Keywords

ASJC Scopus subject areas

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