Positronium as a probe of transient paramagnetic centers in a-SiO_2

D. B. Cassidy; K. T. Yokoyama; S. H. M. Deng; D. L. Griscom; H. Miyadera; H. W. K. Tom; C. M. Varma; A. P. Mills Jr.

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Positronium as a probe of transient paramagnetic centers in a-SiO_2

机译：正电子作为a-SiO_2中瞬态顺磁中心的探针

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A laser-pump, positron-probe technique has been developed for measuring the dynamics of laser-induced paramagnetic centers in porous materials. The basis of the technique is the fact that the annihilation rate of ortho-positronium may increase in the presence of unpaired spins. By using an intense positron pulse to create positronium atoms in a porous silica sample we have used this effect as a probe to measure the time dependence of the recombination of laser-induced paramagnetic centers. We have observed nonexponential postir-radiation decay kinetics extending over ten orders of magnitude that are similar to those previously observed in silica glasses.

机译：已经开发出一种激光泵，正电子探针技术，用于测量多孔材料中激光诱导的顺磁中心的动力学。该技术的基础是这样的事实，即在存在不成对的自旋时，邻-正ron的the灭率可能会增加。通过使用强正电子脉冲在多孔二氧化硅样品中产生正电子原子，我们已将此效应用作探针来测量激光诱导的顺磁中心重组的时间依赖性。我们已经观察到非指数后辐射衰减动力学超过了十个数量级，这与以前在石英玻璃中观察到的相似。

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来源
《Physical review. B, Condensed Matter And Materials Physics》 |2007年第8期|p.085415.1-085415.6|共6页
作者
D. B. Cassidy; K. T. Yokoyama; S. H. M. Deng; D. L. Griscom; H. Miyadera; H. W. K. Tom; C. M. Varma; A. P. Mills Jr.;
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Department of Physics and Astronomy, University of California, Riverside, California 92521-0413, USA;

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正文语种 eng
中图分类固体物理学;
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amorphous semiconductors; glasses; semiconductors; time-resolved optical spectroscopies and other ultrafast optical measurements in condensed matter; positron annihilation;

机译：非晶态半导体;玻璃;半导体;时间分辨光谱学和凝聚态其他超快光学测量;正电子an没;

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1. Electron paramagnetic resonance line shape investigation of the ~(29)Si hyperfine doublet of the E'_γ center in a-SiO_2 [J] . Gianpiero Buscarino, Simonpietro Agnello, Aldo Parlato Physica Status Solidi. C, Conferences and critical reviews . 2007,第3期

机译：α-SiO_2中E'_γ中心〜（29）Si超细双峰的电子顺磁共振线形研究
2. Quenching of positronium by surface paramagnetic centers in ultraviolet- and positron-irradiated fine oxide grains [J] . Saito H., Hyodo T. Physical Review, B. Condensed Matter . 1999,第15期

机译：紫外线和正电子辐照的细氧化物颗粒中表面顺磁中心对正电子的淬灭
3. Temperature Dependence of the Primary Donor Triplet State g-Tensor in Photosynthetic Reaction Centers of Rhodobacter sphaeroides R-26 Observed by Transient 240 GHz Electron Paramagnetic Resonance [J] . Ronghui Zeng, Johan van Tol, Amanda Deal, The journal of physical chemistry, B. Condensed matter, materials, surfaces, interfaces & biophysical . 2003,第19期

机译：瞬态240 GHz电子顺磁共振观察到球形红球菌R-26光合反应中心主供体三重态g态温度的温度依赖性
4. DETECTION OF PARAMAGNETIC CENTERS ON SURFACES OF AMORPHOUS-SiO_2 FINE GRAINS USING POSITRONIUM [C] . H. Saito, Y. Nagashima, T. Hyodo, international conference on positron annihilation;ICPA-10 . 1995

机译：检测非晶态SiO_2细晶粒表面上的顺磁性中心
5. Oxygen as a paramagnetic probe for nuclear magnetic resonance: Structure and paramagnetic profile of a lipid bilayer/membrane model system. [D] . Al-Abdul Wahid, Mohamed Sameer. 2005

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6. TripletState Delocalization in a Conjugated PorphyrinDimer Probed by Transient Electron Paramagnetic Resonance Techniques [O] . ClaudiaE. Tait, Patrik Neuhaus, Harry L. Anderson, -1

机译：三胞胎共轭卟啉中的状态离域瞬态电子顺磁共振技术探测二聚体
7. Transient and Pulsed Electron Paramagnetic Resonance Spectroscopy on Type I Photosynthetic Reaction Centers [O] . Siavashi Reza 2014

机译：I型光合反应中心的瞬态和脉冲电子顺磁共振光谱

Positronium as a probe of transient paramagnetic centers in a-SiO_2

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