论文标题
来自具有电子质量不连续性的金属纳米粒子的表面和音量发射
Surface and volume photoemission from metal nano-particles with electron mass discontinuity
论文作者
论文摘要
来自金属纳米颗粒的表面（SPE）和体积（VPE）光发射的量子效率是通过量子机械扰动理论计算的，并相互比较。随着潜在屏障和介电函数的不连续性，考虑到金属环境界面上电子有效质量的不连续性。得出了SPE和VPE的量子效率的一般公式。考虑了界面上具有矩形电势屏障的球形金颗粒的一个例子，即在光发射的红色边界上的SPE和VPE量子效率的分析公式。发现与VPE的效率相比，随着电子有效质量的降低，SPE的效率降低了，因此SPE比小颗粒的VPE更有效，而有效质量的不连续性较大。当SPE比VPE更有效时，纳米颗粒的大小被发现是数十万个或更小的。
Quantum efficiencies of surface (SPE) and volume (VPE) photo-emissions from metal nanoparticles are calculated by quantum mechanical perturbation theory and compared with each other. Along with discontinuities in the potential barrier and dielectric function, the discontinuity in electron effective mass on the metal-environment interface is taken into account. General formulas for quantum efficiencies of SPE and VPE are derived. An example of spherical gold particles with rectangular potential barrier on the interface is considered, analytical formulas for quantum efficiencies of SPE and VPE on the red border of photoemission are derived. It is found that the efficiency of SPE is less decreased with the reduction of the electron effective mass than the efficiency of VPE, so SPE is more efficient that VPE for small particles and large discontinuity in effective mass. Nanoparticle size, when SPE is more efficient than VPE, is found to be tens of nm or less.
