Age-momentum correlation experiments on industrial grade diamond

Lauff, U.; Nilen, R.W.N.; Connell, S. H.; Stoll, Hermann; Bharuth‐Ram, K.; Siegle, A.; Schneider, Hendrik; Harmat, P.; Wesołowski, P.; Sellschop, J.P.F.; Seeger, A.

doi:10.1016/s0169-4332(96)01067-7

Cited by 5 publications

(2 citation statements)

References 9 publications

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“…It is proposed that this spread is the result of contributions from defect-related positron configurations which have lifetimes too close to the bulk lifetime to be fully resolved. This has been demonstrated in age-momentum correlation measurements on industrial-grade diamond [6]. Only one lifetime component with a lifetime close to the theoretical value reported in this paper (section 5) was observed in an especially defect-free sample [4].…”

Section: Introductionsupporting

confidence: 87%

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The anisotropic electron - positron momentum distribution in diamond

Nilen

Connell

Britton

et al. 1997

J. Phys.: Condens. Matter

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We have performed a high-resolution, high-sensitivity study of the electron-positron momentum distribution in diamond, using the two-detector coincidence Doppler broadening technique of positron annihilation spectroscopy. The measurements were carried out with the 100 , 110 , and 111 axes each separately aligned collinearly with the detectors so that the anisotropy of the momentum distribution could be mapped out. Small differences in the momentum profiles were enhanced with difference spectra, and compare well with results of a density-functional theory calculation of the electron-positron momentum distribution in the diamond lattice. There has been much debate regarding previously unexplained anomalies in the annihilation characteristics of the bulk positron configuration in diamond. These new results strongly support a model describing the bulk positron as delocalized and inhomogeneous, but with sufficient amplitude at the intra-bond region such that the annihilation characteristics are determined by the bond electron density and momentum distribution.

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Section: Introductionsupporting

confidence: 87%

“…The calculation of the electron-positron annihilation rate (equation (6)) yielded a bulk (c) positron lifetime of 96 ps. This is in excellent agreement with the experimental results of Li et al [4] who recorded a bulk positron lifetime of 97.5 ± 1.5 ps for an isotopically pure synthetic diamond.…”

Section: Resultsmentioning

confidence: 99%