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首页> 外文期刊>The journal of physical chemistry, C. Nanomaterials and interfaces >Short time vibrational dynamics of excited metal nanoparticles
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Short time vibrational dynamics of excited metal nanoparticles

机译：激发金属纳米粒子的短时振动动力学

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摘要

The vibrational dynamics of metal nanoparticles following excitation with femtosecond-laser pulses is considered. The induced electronic and lattice pressure contributions cause excitation of breathing modes in spherical particles. Special attention is paid to the role of the excitation of overtones, which affect the short-time dynamics substantially. For instance, the expansion of clusters increases linearly with time. The overtones also lead to shifts of the position of the minima and maxima of the cluster radius as a function of time. They are of comparable size as the shift is due to the inclusion of electron pressure effects in addition to the lattice pressure. Furthermore, the slope of the vibrations becomes discontinuous at certain time points. The proposed theoretical treatment is suited to describe the control of the excitation of acoustic vibrations of nanoparticles.
机译：考虑了飞秒激光脉冲激发后的金属纳米粒子的振动动力学。感应的电子和晶格压力贡献导致激发球形颗粒中的呼吸模式。要特别注意泛音的激励作用，这会极大地影响短时动态。例如，簇的扩展随时间线性增加。泛音还导致簇半径的最小值和最大值的位置随时间变化。它们具有可比较的大小，因为偏移是由于除了晶格压力之外还包括电子压力效应。此外，振动的斜率在某些时间点变得不连续。所提出的理论处理适合描述纳米粒子声振动激发的控制。

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