Collins Alan T, Kiflawi Isaac
Physics Department, King's College London, Strand, London WC2R 2LS, UK.
J Phys Condens Matter. 2009 Sep 9;21(36):364209. doi: 10.1088/0953-8984/21/36/364209. Epub 2009 Aug 19.
The kinetics of the recovery of radiation damage in type Ia diamond has been investigated using isothermal annealing at 600 °C. In diamonds having a reasonably homogeneous distribution of nitrogen the decay of the vacancy concentration with time can be approximately described by a single exponential. Previous investigations have identified 'fast' and 'slow' components in the annealing, and we show that the existence of more than one time constant is associated with inhomogeneous nitrogen concentrations. The measurements show further that, in order to obtain the oscillator strengths of nitrogen-vacancy centres, studies must be restricted to diamonds with moderately high nitrogen concentrations.
利用在600 °C下的等温退火研究了Ia型金刚石中辐射损伤的恢复动力学。在氮分布相当均匀的金刚石中，空位浓度随时间的衰减可用单一指数近似描述。先前的研究已确定退火过程中有“快”和“慢”两个组分，并且我们表明存在不止一个时间常数与氮浓度不均匀有关。测量结果还表明，为了获得氮空位中心的振子强度，研究必须限于具有中等偏高氮浓度的金刚石。
