TY - JOUR
T1 - Recovery process of photochromism of H2 and H3 centres in diamond
AU - Mita, Y.
AU - Ohno, Y.
AU - Adachi, Y.
AU - Kanehara, H.
AU - Nisida, Y.
AU - Nakashima, T.
N1 - Funding Information:
A part of this work has been carried out under the Visiting Researchers Program of Kyoto University Research Reactor Institute. The authors thank Drs. M. Okada and M. Kobayashi of the Institute for the neutron irradiation and use of the experimental facilities.
Copyright:
Copyright 2014 Elsevier B.V., All rights reserved.
PY - 1993/4/13
Y1 - 1993/4/13
N2 - To elucidate the mechanism of photochromism of H2 and H3 centres, i.e. H2(H3-) + X+ + h {combining short stroke overlay}ω → H3 + X0, a study has been made of the recovery process of optical absorption and the photosensitive electron spin resonance (ESR) and thermoluminescence. The ESR measurement indicates that the neutral state concentration of nitrogen is increased by illumination. This fact gives evidence for one of the unknown traps X+ to be ascribed to ionized nitrogen, N+. The glow curve in thermoluminescence after photoexcitation denotes the existence of at least four traps besides N+. The recovery appears logarithmic with respect to time and is faster when the concentration of remaining neutral nitrogen is larger. The recovery rate is almost independent of temperature below 420 K, while it increases with increasing temperature above 420 K. As a result, it has been concluded that the dominant process of the recovery arises via the tunnelling of an electron from a neutral nitrogen atom to an H3 centre rather than via the thermal release of a trapped electron.
AB - To elucidate the mechanism of photochromism of H2 and H3 centres, i.e. H2(H3-) + X+ + h {combining short stroke overlay}ω → H3 + X0, a study has been made of the recovery process of optical absorption and the photosensitive electron spin resonance (ESR) and thermoluminescence. The ESR measurement indicates that the neutral state concentration of nitrogen is increased by illumination. This fact gives evidence for one of the unknown traps X+ to be ascribed to ionized nitrogen, N+. The glow curve in thermoluminescence after photoexcitation denotes the existence of at least four traps besides N+. The recovery appears logarithmic with respect to time and is faster when the concentration of remaining neutral nitrogen is larger. The recovery rate is almost independent of temperature below 420 K, while it increases with increasing temperature above 420 K. As a result, it has been concluded that the dominant process of the recovery arises via the tunnelling of an electron from a neutral nitrogen atom to an H3 centre rather than via the thermal release of a trapped electron.
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U2 - 10.1016/0925-9635(93)90220-V
DO - 10.1016/0925-9635(93)90220-V
M3 - Article
AN - SCOPUS:50749134071
VL - 2
SP - 768
EP - 772
JO - Diamond and Related Materials
JF - Diamond and Related Materials
SN - 0925-9635
IS - 5-7
ER -