کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5376095 | 1504317 | 2007 | 20 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Solvent dynamics in a glass-forming liquid from 300Â K to 3Â K: What photon echoes can teach us
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کلمات کلیدی
MBOLiquid dynamicsAmorphous - آمورفNon-condon effects - اثرات غیرواقعیGlass transition - انتقال شیشهSpectral density - تراکم طیفیGlass forming - تشکیل شیشهBath - حمامPhoton echoes - عکاسی فوتونUltrafast - فوق العادهSoft condensed matter - ماده چگال نرمTemperature dependence - وابستگی دماGlass dynamics - پویایی شیشه
موضوعات مرتبط
مهندسی و علوم پایه
شیمی
شیمی تئوریک و عملی
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: Solvent dynamics in a glass-forming liquid from 300Â K to 3Â K: What photon echoes can teach us Solvent dynamics in a glass-forming liquid from 300Â K to 3Â K: What photon echoes can teach us](/preview/png/5376095.png)
چکیده انگلیسی
The temperature dependence of the optical non-linear response of dye molecules dissolved in a glass-forming liquid over a temperature range that includes the glass transition is investigated. Cooling down to temperatures below the glass transition dramatically slows the diffusive motion of the solvent molecules, while the bath retains its strong amorphous character. The results of ultrafast experiments such as echo-peak shift and heterodyne-detected echo are presented. The temperature dependence of the optical response is discussed within the context of the multimode Brownian oscillator model that is commonly used to describe dynamics in liquids. Freezing out a large part of the bath fluctuations allows for testing of the physical interpretation associated with this model. A temperature-dependent spectral density is proposed that can describe the results at all temperatures over the explored temperature range. The temperature dependence follows readily from the physical processes that are associated with the various parts of the density of states, with the exception of the fastest modes. The temperature dependence of these modes is inspected closely and the spectral shape is reinterpreted.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Chemical Physics - Volume 341, Issues 1â3, 15 November 2007, Pages 123-142
Journal: Chemical Physics - Volume 341, Issues 1â3, 15 November 2007, Pages 123-142
نویسندگان
Kees Lazonder, Maxim S. Pshenichnikov,