HD+离子在两个超短脉冲激光场作用下的解离几率分布

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。

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

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:E₃ and E₂,which are the frequency tripled and doubled fields of wavelength λ=306 7nm laser,respectively.Both of the pulse widths are 10fs.E₂ follows E₃.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 21×10^-18,44×10^-18 and 58×10^-18g·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 E₂ results in the No.1 peak.