Extended Mermin Method for Calculating the Electron Inelastic Mean Free Path

被引：55

作者：

Da, B. ^{[1
]}

Shinotsuka, H. ^{[1
]}

Yoshikawa, H. ^{[1
]}

Ding, Z. J. ^{[2
]}

Tanuma, S. ^{[1
]}

机构：

[1] Natl Inst Mat Sci, Tsukuba, Ibaraki 3050047, Japan

[2] Univ Sci & Technol China, Dept Phys, Hefei 230026, Anhui, Peoples R China

来源：

PHYSICAL REVIEW LETTERS | 2014年 / 113卷 / 06期

基金：

中国国家自然科学基金;

关键词：

ENERGY-LOSS FUNCTION; RAY PHOTOELECTRON-SPECTROSCOPY; DIELECTRIC FUNCTION; OPTICAL-CONSTANTS; CONDENSED MATTER; OXIDIZED SILICON; STOPPING POWERS; SCATTERING; MODEL; SOLIDS;

D O I：

10.1103/PhysRevLett.113.063201

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We propose an improved method for calculating electron inelastic mean free paths (IMFPs) in solids from experimental energy-loss functions based on the Mermin dielectric function. The "extended Mermin" method employs a nonlimited number of Mermin oscillators and allows negative oscillators to take into account not only electronic transitions, as is common in the traditional approaches, but also infrared transitions and inner shell electron excitations. The use of only Mermin oscillators naturally preserves two important sum rules when extending to infinite momentum transfer. Excellent agreement is found between calculated IMFPs for Cu and experimental measurements from elastic peak electron spectroscopy. Notably improved fits to the IMFPs derived from analyses of x-ray absorption fine structure measurements for Cu and Mo illustrate the importance of the contribution of infrared transitions in IMFP calculations at low energies.

引用

页数：5

共 42 条

[1] Dielectric description of wakes and stopping powers in solids [J].