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arXiv physics/0106044physics.atm-clus
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飞秒强脉冲laser中的C $_{60}$:非线性偶极响应和电离

C$_{60}$ in intense femtosecond laser pulses: nonlinear dipole response and ionization

D. Bauer, F. Ceccherini, A. Macchi, F. Cornolti

摘要:

采用含时密度泛函理论研究了强飞秒激光脉冲与C $_{60}$分子的相互作用。所考虑的激光强度低于强碎裂的阈值,但对于诸如线性响应的微扰处理来说太高。利用Kohn-Sham轨道分辨偶极谱分析了该模型对频率高达45 eV的短脉冲激发的非线性响应。在800 nm波长的飞秒激光脉冲中,发现电离发生多光子样,而不是通过激发“巨”共振。

英文摘要:

We study the interaction of strong femtosecond laser pulses with the C$_{60}$ molecule employing time-dependent density functional theory with the ionic background treated in a jellium approximation. The laser intensities considered are below the threshold of strong fragmentation but too high for perturbative treatments such as linear response. The nonlinear response of the model to excitations by short pulses of frequencies up to 45eV is presented and analyzed with the help of Kohn-Sham orbital resolved dipole spectra. In femtosecond laser pulses of 800nm wavelength ionization is found to occur multiphoton-like rather than via excitation of a ``giant'' resonance.

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