用于电子能谱测量的LiF热释光探测器标定

用γ标准源对LiF热释光探测器（TLD）的灵敏度因子、线性吸收系数、离散性、重复性进行了测定。在此基础上建立了电子质量阻止本领的修正模型,理论上计算出电子等效质量阻止本领,给出单能电子的注量。由LiF TLD阵列可测量激光等离子体相互作用中发射的超热电子能谱（能量-注量关系）。     

用于电子能谱测量的LiF热释光探测器标定

 用γ标准源对LiF热释光探测器（TLD）的灵敏度因子、线性吸收系数、离散性、重复性进行了测定。在此基础上建立了电子质量阻止本领的修正模型，理论上计算出电子等效质量阻止本领，给出单能电子的注量。由LiF TLD阵列可测量激光等离子体相互作用中发射的超热电子能谱（能量-注量关系）。     

The electron energy loss spectrum of EuO(100)

Energy losses of 200 eV to 2 keV electrons reflected from a disordered EuO(100) crystal show a bulk plasmon loss consistent with just less than six “quasi free” electrons per EuO unit, and 5p → nd resonance losses above the 5p threshold. The ratio of intensity of the 4d¹⁰ 4fⁿ⁰ → 4d⁹ 4fⁿ⁺¹ “giant resonance” loss at 142 eV to the corresponding direct recombination feature varies with energy, while the direct recombination and related Auger channels show similar energy dependence.     

The electron energy loss spectrum of tin at low primary beam energies

The electron energy loss spectra of clean and oxidised tin have been measured for primary energies in the range 100–1000 eV. The structure found for clean tin is similar to published spectra recorded with low primary energies except for the presence of a small peak at 4.7 eV. Differences between the reported volume plasmon energy recorded with low and high primary beam energies were noted and a model is presented to explain these differences in terms of plasmon dispersion.     

The electron energy loss spectrum of Br on Au (100)

The electron energy loss spectrum of Br on Au (100) shows a sharp loss at 2.5 eV accompanied by a weaker broader feature at 5.5 eV and a broad enhancement centred at 16 eV. It is suggested that an adsorbate resonance lies above the top of the d-band allowing adsorbate → free metal state transitions without appreciable coupling to or competition from metal excitations.     

Theory of spin-flip excitations across the ferromagnetic stoner gap in electron energy loss

We present calculations based on a simplified band model of the spin-flip cross section expected in electron energy loss in a ferromagnetic metal. It is shown how direct production of Stoner excitations can lead to observable features in both spin polarized and ordinary EELS spectra. A strong primary electron energy dependence is predicted for all these spin-flip features, in agreement with recent experiments.     

Effect of surface excitations on the reflection electron energy loss spectrum in silicon

The results of investigating the relative contribution of surface excitations to the reflection electron energy loss spectrum in pure silicon are presented. The primary electron energy is in the range 60–1000eV. Good agreement is obtained between the experimental values of the surface parameter P _S and theoretical calculations. The relative contribution of surface excitations is also determined by decomposing the integral reflection electron energy loss spectra into Gaussian curves.     

The influence of crystal orientation on the electron energy loss spectrum of monocrystalline silver films

In electron energy loss measurements (50 keV) on monocrystalline silver films in transmission the intensity of the 3.8 eV volume plasma loss is found to be dependent on the crystal orientation. If the crystal is tilted relatively to the electron beam by an angle α the elastic intensity I_el in the primary direction oscillates by 10%, the intensity of the volume plasmon however varies much stronger similar to I_el; it can become even zero at certain angles α. The intensity of the surface loss is nearly proportional to the elastic intensity. An explanation of this phenomenon is missing. Presumably it must lie in the dynamic theory of electron diffraction.     

Fast electron energy loss spectrum of an amorphous tungsten trioxide film

The forward scattering energy loss spectrum of 300 KeV electrons transmitted through thin films of WO₃ has been measured in the energy range of 0.8–225 eV with an energy loss resolution of 0.1 eV. Energy losses due to excitation of color centers, inter band transitions and core elestrons in WO₃ have been identified. Measurement of the elastic electron difraction pattern revealed the amorphous nature of the film with structural differences depending upon the preparative methods.     

The electron energy spectrum of the alloy FeCo

The electron energy spectrum of the ordered alloy FeCo is analyzed by the Green's function method. The dependence of the spectrum on the electron configuration of the alloy components is investigated.Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Fizika, No. 2, pp. 61–69, February, 1977.     

一种由电子能量损失谱计算过渡金属d电子数的优化方法

提出了一种由电子能量损失谱(EELS)计算过渡金属d电子数的“浮动窗口”方法,该方法是对现有方法的优化,它消除了现有方法中存在的严重的系统误差,能达到较高的精度. 它的应用对于认识元素合金化后d电子数的变化以及电子结构与材料性能的关系具有重要意义. 关键词： 电子能量损失谱 浮动窗口方法 d电子数     

The contribution of the central region of the electron energy spectrum to the total double photoionization cross section of helium in the asymptotic nonrelativistic energy region

The double photoionization of helium at high photon energies is considered using a nonrelativistic approach. The central region of the energy spectrum and its contribution to the total process cross section and to the ratio between the double and single ionization cross sections are studied. Interelectronic interaction in the initial state is included exactly, whereas the interaction between the fast outgoing electrons is calculated by perturbation theory. A detailed derivation of the expression for the cross section ratio between double and single ionizations is given. The corresponding results obtained by other authors are analyzed and corrected.     

Energy band gap and electron spin polarization in photoemission

A contribution to the electron spin polarization in photoemission is investigated for the transition from occupied states in conduction bands to the states whose energies lie in a band gap. This contribution can be either positive or negative.     

Photoacoustic determination of energy band gap of semiconductors

Semiconducting materials are employed in the fabrication of a number of semiconductor devices and opto-electronic detectors etc depending on their properties, state of purity and perfection and energy band gap values. In the present study, a latest and novel photoacoustic spectroscopic technique has been employed for the determination of energy band gap of some semiconductors namely CdS, CdSe, CdTe, ZnS, ZnO, Se and Si in the powder form. Values obtained have been compared with those reported by conventional methods.     

Analysis of bend loss in waveguides employing photonic band gap effect

We analyse bend loss properties of a band gap-guided periodic structure, and give reasons for the effects found. In many cases, a tight bend produces only a slight reduction in power transmitted. We also make a comparison of bend losses in conventional waveguides and bend-resistant waveguides.     

A study on the optical non-linearity near the band gap energy region of CuCl by the non-degenerate reflected four-wave mixing

We have demonstrated three beam non-degenerate reflected four-wave mixing (reflected FWM) in which two driving fields have the same photon energy (?ω₁) and the monitor and the resulting mixed light fields have another equal photon energy (?ω₂). Mixed light has been observed with the driving field's energy from Z₃ exciton up to band gap energy when ?ω₂ is fixed in the Z₃ and Z_1,2 exciton resonance region. The mechanism by which such non-degenerate optical non-linearity occurs is discussed according to a calculation by a simple model.