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首页> 外文期刊>Physical review >Observation of the transition from image-potential states to resonances on argon-covered Cu(111) and Ag(111) by time-resolved two-photon photoemission
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Observation of the transition from image-potential states to resonances on argon-covered Cu(111) and Ag(111) by time-resolved two-photon photoemission

机译：通过时间分辨双光子光发射观察从图像电势状态到氩覆盖的Cu（111）和Ag（111）上的共振的跃迁

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摘要

The influence of well-ordered adlayers of Argon on binding energies and inelastic lifetimes of image-potential states and resonances on Cu(111) and Ag(111) has been investigated by means of time-resolved two-photon photoemission spectroscopy. The adsorption of Ar layers on metals results in a strong decoupling of the image-potential states that goes along with an exponential increase in their inelastic lifetimes and a lowering of their binding energies. The latter shifts the first (n= 1) image-potential state above the minimum of unoccupied projected bulk bands on Cu(111) and thereby induces a transition from an image-potential state to a resonance. This leads to a strikingly different dependence of the inelastic lifetime of the n= 1 state on Ar layer thickness for the two surfaces. On Ag(111) the lifetime shows a continuous exponential increase with layer thickness from 32 fs on the clean surface to about 6 ps for an Ar coverage of four monolayers (ML). On Cu(111) the exponential increase is considerably reduced when the n=1 state becomes a resonance. Up to 10 ML of Ar the lifetime on Cu(111) does not exceed 3 ps. This rather unexpected behavior can neither be explained by a simple tunneling picture of the tunneling through thin Ar films nor by model calculations using a one-dimensional model potential that accounts for the most important electronic properties of both the metal substrate as well as of the Ar layers.
机译：已经通过时间分辨双光子光发射光谱法研究了有序的添加层对结合能，图像势态的非弹性寿命以及对Cu（111）和Ag（111）的共振的影响。 Ar层在金属上的吸附会导致图像电势状态发生强烈的解耦，随之而来的是其非弹性寿命呈指数增长，并且其结合能下降。后者将第一个（n = 1）图像电势状态移到Cu（111）上未占用的投影体能谱带的最小值上方，从而引发从图像电势状态到共振的转变。这导致两个表面上n = 1状态的非弹性寿命对Ar层厚度的依赖性显着不同。在Ag（111）上，对于四个单层（ML）的Ar覆盖，其寿命随着层厚度从洁净表面上的32 fs到约6 ps的连续指数增长而增加。在Cu（111）上，当n = 1处于共振状态时，指数增加显着减少。高达10 ML的Ar，在Cu（111）上的寿命不超过3 ps。这种相当出乎意料的行为既不能通过穿过Ar薄膜的简单隧穿图来解释，也不能通过使用一维模型势能进行模型计算来解释，该一维模型势能兼具金属基板和Ar的最重要的电子性能。层。

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  • 来源
    《Physical review》 |2009年第20期|205425.1-205425.9|共9页
  • 作者

    A. Damm; K. Schubert; J. Guedde; U. Hoefer;

  • 作者单位

    Fachbereich Physik und Zentrum fuer Materialwissenschaften, Philipps-Universkaet, D-35032 Marburg, Germany;

    Fachbereich Physik und Zentrum fuer Materialwissenschaften, Philipps-Universkaet, D-35032 Marburg, Germany;

    Fachbereich Physik und Zentrum fuer Materialwissenschaften, Philipps-Universkaet, D-35032 Marburg, Germany;

    Fachbereich Physik und Zentrum fuer Materialwissenschaften, Philipps-Universkaet, D-35032 Marburg, Germany;

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  • 正文语种 eng
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  • 关键词

    electron states at surfaces and interfaces; metal-nonmetal contacts; photoemission and photoelectron spectra;

    机译：表面和界面的电子态;金属-非金属触​​点;光发射和光电子能谱;

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