Nonequilibrium collective dynamics in photoexcited lipid multilayers by time resolved diffuse x-ray scattering.
Nonequilibrium collective dynamics in photoexcited lipid multilayers by time resolved diffuse x-ray scattering.
复制标题
时间分辨漫射 X 射线散射光激发脂质多层中的非平衡集体动力学
DOI：
10.1103/physrevlett.111.268101
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发表时间：
2013
影响因子：
8.6
通讯作者：
Salditt T
中科院分区：
文献类型：
--
作者：
Reusch T;Mai DD;Osterhoff M;Khakhulin D;Wulff M;Salditt T
我们研究了由模型脂类DOPC和著名的脂类染料德州红组成的荧光标记磷脂多层膜在短激光脉冲作用下的非平衡形状波动。用时间分辨X射线衍射仪记录了激发后脂质双分子层波动的时间演化。在中等峰值强度()下，脉冲激光照射导致在一个明确的横向波长带内的起伏模式发生显著变化。观察到的现象在光激发后在纳秒到微秒的时间尺度上演变，并可以用脂质多层堆栈中的调制不稳定性来描述。
We study the nonequilibrium shape fluctuations in fluorescence labeled phospholipid multibilayers composed of the model lipid DOPC and the well-known lipid dye Texas red, driven out of equilibrium by short laser pulses. The temporal evolution of the lipid bilayer undulations after excitation was recorded by time resolved x-ray diffraction. Already at moderate peak intensities (), pulsed laser illumination leads to significant changes of the undulation modes in a well-defined lateral wavelength band. The observed phenomena evolve on nano- to microsecond time scales after optical excitation, and can be described in terms of a modulation instability in the lipid multilamellar stack.