HD^+离子在两个超短脉冲激光场作用下的解离几率分布  

DISSOCIATION PROBABILITY DISTRIBUTION OF HD + ION IN TWO ULTRASHORT PULSED LASER FIELDS

作　　者：王国文[1] 

机构地区：[1]北京大学物理学系

出　　处：《光子学报》1999年第1期17-20,共4页Acta Photonica Sinica

基　　金：国家自然科学基金

摘　　要：本文报告ＨＤ＋离子在波长λ＝３０６．７ｎｍ的三倍频超短脉冲弱光场Ｅ３和不同延时的二倍频超短脉冲强光场Ｅ２作用下解离几率分布的定量计算结果．Ｅ３和Ｅ２的脉冲宽度均为１０ｆｓ．Ｅ３先行，Ｅ２延时取０、４、８、１２、１６、２０、２４、２８ｆｓ．计算结果用三维图表出．图中看到，沿相对动量坐标有三个峰，分别位于动量２．１×１０－１８、４．４×１０－１８、５．８×１０－１８ｇ·ｃｍ／ｓ处，依次称为１号峰、２号峰、３号峰，位置各是λ＝３０６．７ｎｍ的单光子能量、双光子能量、三光子能量消耗于解离能之后离子碎片具有相对动量．据分析，１号峰来源于Ｅ２场引起的受激发射作用．In this paper it is presented the quantitative calculation results of the dissociaton probability distribution of HD + ion in weak and strong ultrashort pulsed laser fields:E 3 and E 2,which are the frequency tripled and doubled fields of wavelength λ=306 7nm laser,respectively.Both of the pulse widths are 10fs.E 2 follows E 3.The time delays are 0,4,8,12,16,20,24 and 28fs.The results are shown in two 3 dimensional plots.It is seen in them that there are three peaks at 2 1×10 18 ,4 4×10 -18 and 5 8×10 18 g·cm/s in the dimension of the relative momentum,refered as No.1,No,2 and No.3 peaks,whose coordination values are the relative momenta of the dissociation fragments correspondig to one photon ,two photon and three photon energies of the λ=306 7nm field minus the dissociation energy.By analysis,the stimulated emission by E 2 results in the No.1 peak.

关 键 词：超短脉冲 激光 解离几率 受激发射 HD^+离子 

分 类 号：TN241[电子电信—物理电子学]