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首页> 外文期刊>Physical review. B, Condensed Matter And Materials Physics >Simulation of two-photon photoemission from the bulk sp -bands of Ag(111)
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Simulation of two-photon photoemission from the bulk sp -bands of Ag(111)

机译：Ag（111）体sp带的双光子光发射模拟

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摘要

Theoretical and experimental studies on the two-photon photoemission excited by femtosecond laser pulses from the sp-band of Ag(111) in normal direction are reported. At low temperatures, the two-photon photoemission spectrum is found to consist mainly of nonresonant direct transitions from the lower to the upper sp-band across the L-projected band gap involving the upper sp-hand as virtual intermediate states. This direct photoemission signal is calculated from the Ag band structure using optical Bloch equations and dipole moments derived from the nearly free electron approximation. For finite temperatures, a minor additional temperature-dependent, continuous contribution to the two-photon photoemission spectrum is experimentally determined. This background due to the secondary electrons is theoretically modeled combining the Debye model and Fermi Liquid Theory to account for electron relaxation effects during the two-photon photoemission process.
机译：飞秒激光脉冲从Ag（111）的sp带沿法向激发的双光子光发射的理论和实验研究进行了报道。在低温下，发现双光子光发射光谱主要由从低sp谱带到高sp谱带的跨整个L投影带隙的非共振直接跃迁组成，涉及高谱针作为虚拟中间态。使用光学布洛赫方程和从近乎自由电子近似得到的偶极矩，从Ag带结构计算出此直接光发射信号。对于有限的温度，通过实验确定了对双光子光发射光谱的较小的，与温度有关的，连续的贡献。在理论上结合了德拜模型和费米液体理论对由于二次电子引起的这种背景进行了建模，以说明双光子光发射过程中的电子弛豫效应。

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