27Al+光频标作为下一代光学频率基准的候选方案之一,其1S0-3P0 跃迁谱线具有自然线宽仅8mHz,电四极频移为0,黑体辐射相对频移在环境温度为300K 时仅4×10-19等诸多优点.
寻找影响化学键断裂的依赖因素以便在原子分子尺度上操控化学反应,是分子碎裂研究的重要目标。这一领域在Neumann等人[1]发现CO2的次序解离后,变得非常活跃。但是,次序解离的具体过程至今尚不清楚。
Decelerated and trapped ammonia molecules(NH3)are detected using two different schemes;(i)non-resonant multiphoton ionization using intense femtosecond pulses in the near infrared and(ii)resonance-enh
Second harmonic generation(SHG)and sum-frequency generation(SFG)spectroscopy are powerful and versatile tool for interface and surface studies.White light generation,which is also called supercontinuu
Sum-frequency vibrational spectroscopy in the CH and OH stretch region was used to study ethanol adsorption on fused silica from vapor of different ethanol partial pressures.
We experimentally demonstrate a robust scheme to select a single high-order harmonic among the harmonic comb by using a driving laser field with subcycle waveform control,which is synthesized by the f
近年来SnO作为少数几种p型透明导电材料之一逐步受到人们的重视[1].然而由于SnO为间接带隙半导体(G->M:~0.4 eV),使其难以作为有源层应用于光电器件中.最近有研究表明,随着SnO外延层厚度的减小,其可见光吸收边发生蓝移.本文利用第一性原理计算了单层及多层SnO的电子结构.
激光诱导等离子体光谱的辐射强度能通过改变激光的各种参数而变化(激光波长、脉冲宽度、强度等),同时激光的光斑尺寸(靶于透镜之间的距离)对光谱辐射也有很大的影响.2014年,Giacomo等人研究了纳米粒子加强的激光诱导等离子体光谱[1],在此工作里,激光诱导产生的等离子体光谱通过在金属样品表面沉积一定的纳米粒子而明显地加强了,这是因为金属表面的纳米粒子有效地增加激光与物质的相互作用,降低了样品的损伤
Characterizing and controlling the magnetic properties of individual atoms are of great interest for their potential application in spintronics.
Motivated by the properties of the iron chalcogenides,we study the phase diagram of a generalized Heisenberg model with frustrated bilinear-biquadratic interactions on a square lattice.