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f centers
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  f心
     Additional absorption band of Eu~(2+) ions,which peaked at 300 nm and 390 nm,were produced in irradiated and(H_2-annealed) Eu~(3+)∶Y_2SiO_5 crystal,except absorption bands of F centers and O~-centers.
     在Eu3+∶Y2SiO5晶体中,不但有相同的F心和O-心吸收峰,而且还有Eu2+离子在300 nm和390 nm的吸收峰。
短句来源
     However,the emission spectrum around 280nm and 420nm should be caused by F~+ and F centers.
     而280nm、420nm左右的荧光发射分别是由F+和F心造成的。
短句来源
     The results showed that 1.5 and 1.8MeV electron irradiation at the dose of 10 15 ~10 16 cm -2 induced F H pairs, F centers and other centers perturbed by impurities in BaF 2∶Sr crystals.
     研究结果表明,能量为1.5MeV和1.8MeV的电子束对Sr∶BaF2晶体的辐照注量达1015~1016cm-2时,诱生FH对、F心及其与杂质的复合色心。
短句来源
     The absorption spectra of undoped and Eu~(3+)-doped Y_2SiO_5 single crystals before and after gamma irradiation were studied. Additional absorption peaks at 260~270 nm and 320 nm were observed in irradiated Y_2SiO_5 crystal with no annealing or hydrogen-annealing,which were respectively caused by F centers and O~-centers.
     研究了γ-辐照前后纯Y2SiO5和Eu3+掺杂的Y2SiO5晶体吸收光谱的变化,辐照后,未退火和氢气退火的纯Y2SiO5晶体在260~270 nm和320 nm波段产生了附加吸收峰,分别是由F心和O-心的吸收引起的;
短句来源
     It is suggested that F centers in the crystal can be transferred into F A(Sr 2+ )centers by He Ne laser (wavelength:632.8nm)excitation,and this process can be reversed by Na light (wavelength:589.0,589.6nm)excitation.
     用波长为632.8nm的HeNe激光照射电子辐照着色的样品,可使F心转型成FA(Sr2+)心; 再用钠光(589.0,589.6nm)照射,又可将FA(Sr2+)心部分回转成F心
短句来源
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  f色心
     The relation between positron annihilation lifetime and defects in BaFxCl2-x:Eu2+ phosphors is studied. The experimental result shows that the formation of F centers is influenced by the x value (or the F/Cl ratio) of the samples. The relation between the x value and the type and concentration of F centers is also presented.
     讨论了光激励发光材料BaFxCl2-x:Eu2+中的缺陷与正电子湮没寿命的关系.通过实验结出随着x值的改变即F/Cl比值的变化对形成F色心的影响,并且给出了x值与F色心的种类与浓度的关系.
短句来源
  f中心
     The characteristics of ESR signals used in the dating of hamal tooth enamel fossils have been investigated. According to the comparison of the results obtained from tooth enamel with those born pure substance and the study by positron annihilation technique, it can be concluded that the paramagnetic centers of tooth enamel is Produced by PO3-4 ion formed F centers.
     用电子自旋共振方法考察了动物牙化石样品测年信号的来源和性质.通过与纯物质的比较和使用正电子湮没技术进行的研究表明牙化石珐琅样品顺磁中心是由PO3-4子产生的F中心所形成.
短句来源
  “f centers”译为未确定词的双语例句
     It isconcluded from experimental results that when the temperature is lower than150℃, the main features of the thermal decay processes of these F-aggregatecenters are the release and capture of electrons, and at temperatures between150℃ and 360℃, these F-aggregate centers discompose into single F centers.
     根据实验结果得出结论:150℃以下F聚集心的热衰变过程以电子得失为主; 而在150—360℃之间,主要是F聚集心分解为单个K心的过程。
短句来源
     The samples of BaF2-xClx and BaFCl:Eu2+ are prepared. It is proved that F centers and VK(Cl2-)centers exist in the X-irradiated BaF2-xClx by the technique of electron spin resonance.
     本文报导了BaF2-xClx和BSFCl:Eu2-(0.1%)两种粉未样品的制备过程;
短句来源
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  f centers
There are two irreversible processes responsible for this increase in F→M conversion:1)random distribution of the F centers over multiple Fi centers;2)random distribution of the dose over multiple traps.
      
The radiation-induced instability of stable F centers in AHC at room temperatures is associated with the destruction of X3- centers and the thermal instability of X5- and X7- centers.
      
Theory of the Cotton-Mouton effect for shallow F centers
      
A mechanism is proposed for the thermally stimulated and photostimulated creation of Vk centers with free electrons, liberated from F' and F centers, recombining with V2 and V4 centers.
      
The mechanisms underlying the optical breakdown of the F centers are considered on the basis of the kinetic decoloration curves.
      
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Moderate conentration and well-distributed F centers were created in Li-Na doped KCl crystals through diffusion. Hg lamp was used for the centers conversion and FA (II)-FB (II) centers were obtained. Absorption spectrum of the crystal was measured at 77 K, in which double-peaks structure was displayed obviously. Luminous spectrum of FB(II)-FA(II) centers was measured at the same temperature. The luminous peaks of FB(II)-FA(II) centers are at 2.49 μm and 2.66μm respectively. Using...

Moderate conentration and well-distributed F centers were created in Li-Na doped KCl crystals through diffusion. Hg lamp was used for the centers conversion and FA (II)-FB (II) centers were obtained. Absorption spectrum of the crystal was measured at 77 K, in which double-peaks structure was displayed obviously. Luminous spectrum of FB(II)-FA(II) centers was measured at the same temperature. The luminous peaks of FB(II)-FA(II) centers are at 2.49 μm and 2.66μm respectively. Using the point ion model and taking into consideration the contribution of the second-nearest ions in the ion size correction, the unperturbed state of FA(Li) center in KCl crystal was obtained. Then energy level of FA center was calculated using perturbation method. The result is satisfactory compared with the experiment data.

采用扩散法在KCl:Li:Na晶体中形成了浓度适当、分布均匀的F心.以汞灯进行色心转型,获得了F_A(II)心和F_B(II)心.测量77K时晶体的吸收谱,观察到明显的双峰结构.在相同的温度下测得晶体的荧光谱.F_b(II)心和F_A(II)心的荧光峰分别为2.49μm和2.66μm.采用点离子模型并在离子尺度修正中计入次近邻离子的贡献,计算了KCl晶体F_A(Li)心的非微扰态,然后以微扰法计算了F_A(Li)心的能级位置.计算值与实验值比较,结果令人满意.

The F_A(Ⅲ)-center in alkali halide crystals have a good thermalstability,A method of increasing the concentration of F_A(Ⅲ)-centers by lightirradiation bleaching to transform F-centers into F_A(Ⅲ)-centers performed inthe laboratory of the present authors are reported in this paper.The problemssuch as light irradiation dosages and transition temperatures are also discu-ssed.

碱卤晶体中 F__A(Ⅲ)心是俘获电子型色心,具有良好热稳定性的色心激光结构。本文介绍了我们采用对 F 心光照漂白,使 F 心转型来提高 F_A(Ⅲ)心浓度的方法。同时也对光照剂量、转型温度及辐照剂量等问题提出了自己的看法。

ESR method was used to study the properties of paramagnetic centers generated by y- irradiating silica gel containing respectively phosphorus and boron as impurity ions. Oxygen holes O- were found to be stablized close to impurity ions. In addition, O2- radical and F colour center signals were observed and investigated. A dynamic equilibrium process would exist during F centers formation.

分别掺有磷和硼的二氧化硅经γ辐照后产生多种顺磁性中心,ESR研究指出氧空穴O~-主要稳定在杂质离子附近.O_2~-自由基稳定在Si离子上.F心的研究认为氧缺位俘获电子存在一个动态平衡过程.

 
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