Dynamics of photoinduced phase transitions studied by infrared and raman spectroscopy
Dynamics of photoinduced phase transitions studied by infrared and raman spectroscopy
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用红外和拉曼光谱研究光致相变动力学
DOI：
10.1002/pssb.201000671
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发表时间：
2011
期刊：
影响因子：
--
通讯作者：
S.Ohkoshi
中科院分区：
文献类型：
--
作者：
T.Suemoto;R.Fukaya;A.Asahara;M.Nakajima;H.Tbkoro;S.Ohkoshi
未透露的方面的光致相变进行了讨论，特别强调放在域和域边界。CN−振动光谱，这是敏感的相变和边界，适用于光磁相变材料，RbMn[Fe（CN）6]。从光致低温到高温相变的时间分辨IR测量，观察到边界的瞬态出现以及1 ps内的新相。利用室温下的拉曼光谱研究了高温相样品在紫外光照射下低温相和晶界的生长过程。结果表明，新相优先出现在新相区，长时间辐照后留下大量高温相的未配对碎片。六氰合铁酸盐光致相变过程中两相和晶界的典型分布（模拟）。蓝色：初始阶段;红色：新阶段;绿色：边界。
Unrevealed aspects of the photoinduced phase transition are discussed with a special emphasis placed on domains and domain boundaries. The CN−vibration spectroscopy, which is sensitive to the phase changes and boundaries, is applied to photomagnetic phase transition material, RbMn[Fe(CN)6]. From time‐resolved IR measurements for photoinduced low temperature to high temperature phase transition, the transient appearance of the boundaries as well as the new phase within 1 ps is observed. The growth processes of the low temperature phase and boundaries during UV irradiation on the sample in high temperature phase are investigated by Raman spectroscopy at room temperature. The result suggests that the new phase appears preferably in the fresh area and a lot of unpaired fragments of high temperature phase are left behind after a prolonged irradiation.Typical distribution of two phases and boundaries in hexacyanoferrate during photoinduced phase transition (simulation). Blue: initial phase; red: new phase; green: boundary.