Photochemistry : study the interaction between small molecules and radiation . measure the absolute photoabsorption and photoionization crosss sections , identify photochemical products , and elucidate energy evolution . application : combustion chemistry and atmospheric chemistry 一)光化学:研究光与小分子的作用.测量绝对光吸收及光游离的截面积值,验明光化学产物为何,以了解光化学反应的能量走向.应用:燃烧化学及大气化学
Fe layers of different thickness have been converted to fes2 thin films by thermal sulfidation . the influence of the thickness on the crystal structure , electrical resistivity , carrier concentration , absorption coefficient and energy gap of fes2 thin films have been investigated 采用硫化不同厚度的fe膜制备了不同厚度的fes2薄膜的方法，研究了不同厚度fes2薄膜的晶体结构、电阻率、载流子浓度、光吸收系数以及禁带宽度。
The samples were characterized by x - ray diffraction ( xrd ) , optical spectroscopy , transmission electron microscopy ( tem ) and scanning tunneling microscopy ( stm ) . as a result , a self - assembled monolayer ( sam ) of msa on the surface of fee au particles was directly observed in atomic level 在此基础上，对金纳米粒子和其自组织结晶体进行了一系列的x射线衍射仪( xrd ) 、透射式电子显微镜( tem ) 、光吸收谱和扫描隧道显微镜( stm )的检测和分析。
( 3 ) since the gas inferred absorption coefficient is very small , when the light ab - sorption measurement is directly used , there are not only light route interference , but also no relationship between content and density . then the signal is very difficult to amplify , ( 3 )由于气体近红外吸收系数很小，直接应用光吸收检测时，信号中不仅有光路干扰，还有很大部分与浓度无关，信号难以放大，检测灵敏度受到限制，因此要减小和消除检测信号中与浓度无关的成分。
And it has a high absorption coefficient ( > 10 ~ 4cm ~ ( - 1 ) ) and a high conversion efficiency of ~ 25 % . in addition , elements sn and s are abundant and non - toxic in nature , which has good compatibility to environment . thus , it can be used as an absorbing layer material in the solar photovoltaic cells 其具有很大的光吸收系数( > 10 ~ 4cm ~ ( - 1 ) ) ,且在理论上其能量转换效率最高可达到25 % ,其组成元素在地球上储存含量丰富,有很好的环境兼容性,因而非常适合于作为太阳能电池中的光吸收层。
With the joint action of the q - switched pulse laser of 532nm and continuous probe light of different wavelengths , fast photoresponse characteristic of photocycle of a wild - type br film ( wt3 ) and photoabsorption characteristic of different intermediary in the photocycle are analyzed and discussed . the optical switch action in the microsecond scale is observed in the experiment 在532nm的调q脉冲激发光和不同波长的连续探测光作用下，分析和研究了野生型的细菌视紫红质( wt3 )膜的光循环过程中的快速响应特性及各中间态的快速光吸收特性，得到了微秒级的快速光开关结果。
