Temperature Dependence of Electron Spin Relaxation of 2,2-diphenyl-1-picrylhydrazyl in Polystyrene.
Temperature Dependence of Electron Spin Relaxation of 2,2-diphenyl-1-picrylhydrazyl in Polystyrene.
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聚苯乙烯中 2,2-二苯基-1-三硝基苯肼电子自旋弛豫的温度依赖性。
DOI：
10.1007/s00723-012-0417-7
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发表时间：
2013
影响因子：
1
通讯作者：
Eaton,GarethR
中科院分区：
文献类型：
--
作者：
Meyer,Virginia;Eaton,SandraS;Eaton,GarethR
用反转恢复和电子自旋回波方法研究了稳定的自由基2，2-二苯基-1-苦基肼掺杂聚苯乙烯在20~295K温度范围内的电子自旋弛豫速率。在低浓度下(340KμM，0.01K%)，自旋晶格弛豫主要由拉曼过程和局域模式主导。在高浓度(140 mm，5%)时，弛豫比低浓度快几个数量级，1/T1近似线性依赖于温度。X波段和Q波段的自旋晶格驰豫速率相似。自旋回波退相的温度依赖关系在140℃左右比在较高或较低温度下更快，这归因于苯基的摆动运动。
The electron spin relaxation rates for the stable radical 2,2-diphenyl-1-picrylhydrazyl (DPPH) doped into polystyrene were studied by inversion recovery and electron spin echo at X-band and Q-band between 20 and 295 K. At low concentration (340 μM, 0.01 %), spin–lattice relaxation was dominated by the Raman process and a local mode. At high concentration (140 mM, 5 %), relaxation is orders of magnitude faster than at the lower concentration, and 1/T1is approximately linearly dependent on the temperature. Spin lattice relaxation rates are similar at X-band and Q-band. The temperature dependence of spin echo dephasing was faster at about 140 K than at higher or lower temperatures, which is attributed to a wagging motion of the phenyl groups.