Ba(1S)+N2O反应的化学发光偏振研究

The variation of ehemiluminescent polarization for reaction Ba(~1S)+N_2O with respect to the Ba beam temperature or the average collision energy E_(rtr) was studied under the single collision condition on beam-gas apparatus. If E_(rtr)<0.06 eV, the distribution of rotational angular momentum for product BaO, i.e. -, increased with the impact energy; while E_(rtr)>0.06 eV, - decreased with the E_(rtr). It is plausible to point out the corresponding relationship between the characteristics of the reaction potential surface and the conformation of the intermediate complexes.     

亚硝基苯光解过程中的能量配置

利用单光子激光诱导荧光(LIF)技术,测量了亚硝基苯(C6H5NO)初生态光解碎片NO(X 2Π v″=1,2,3)的转动光谱.通过对初生态光解碎片NO(X 2Π )内能态布居的分析,得到了NO(X 2Π )的转动温度和相对振动布居比,研究了亚硝基苯在266 nm激光光解过程中的能量配置情况.与小分子相比,大的亚硝基苯分子,其光解过程中能量分布很宽,涉及到所有自由度.     

Ba(~3D)+N_2O化学发光反应的动态学研究

本文研究了单次碰撞条件下Ba(~3D)+N_2O→BaO~*+N_2反应的动态学特性。由束气实验测出这个反应的化学发光截面是42.2±1.4(?)~2,总碰撞截面是142±11(?)~2。由化学发光光谱分析出反应产物中存在着BaOD~1∑~+→A~1∑~+→X~1∑~+二次电子跃迁过程。通过交叉分子束实验,研究化学发光截面与反应物振动能、碰撞能的关系。结果表明,这个反应的势能面不存在阈能垒,振动能对化学发光截面影响不大,而平动能的增加会使化学发光截面减小。本文采用信息论方法,计算产物态的分支比,并和实验结果进行对比分析。     

Ar+激光激励Pb2的色散荧光谱

The dispersed fluorescence spectra of Pb_2 dimer were recorded from the excitation of Ar~+ laser in HPOR. By the detailed spectroscopic analysis for this well-resolved fluorescence spectra, the ground state of pb_2 molecule and one of its electronically excited state were assigned preliminarily to be X~1∑_g~+ and F′Ⅱ_u state respectively.The spectral constants of the X and F are ω_e″=108.5 cm~(-1),ω_e″X_e″ = 0.209 cm~(-1), ω_e′=152.4 cm~(-1), ω_e′X_e′=0.636 cm~(-1) and T_e=19818,1 cm~(-1)., respectively     

单光子LIF方法研究亚硝基苯266 nm光解动力学

用266nm激光解离亚硝基苯（C6H5NO）产生光解碎片NO,并利用单光子激光诱导荧光（LIF）技术（X^2Ⅱv″=0→A^2∑^+v′=0）测得初生态光解产物NO的振转光谱。根据计算所得的模拟光谱对光解碎片NO（X,v^″＝0）的转动量子数J″进行了归属,得到了量子数最大到J″＝50．5的转动能级的相对布居,这表面光解碎片NO具有较高的转动激发。提出了C6H5NO在266nm下可能的光解机理。     

氯苯266nm激光光解碎片的平动能及角分布

用探测器转动的通用型交叉分子束装置测定了氯苯在２６６ｎｍ激光光解碎 片（Ｃｌ）不同角度的ＴＯＦ谱;得到了其实验室角分布（各向异性参数被确定为０．４）及碎 片质心系平动能分布,模拟结果表明碎片平均平动能占可资用能的２０％;用从头算 方法对低激发态的构型作了优化,对光解机理进行了探讨,认为：氯苯在 ２６６ ｎｍ的 光解是一慢速的预解离过程,光解过程中,母分子构型的变化起着重要作用．     

Photofragment translational spectroscopy of iodobenzene at 266 nm

The photofragmentation of C_6 H_5I at 266 nm is investigated on the nuiversal crossed molecular beam machine, and the translational spectroseopy as well as the angular distribution of I atom is measured. The results reveal that under the laser intensity of 10~8 W/cm~2 the single-phuton dissociation competes with multi-photon processes. In singlephoton dissociation the anisotropy parameter β is 0.4 and the average translational energy is only 1.04 keal/mol, which indicates that this process is a slow predissociation. In two-photon phutofragmentation the average translational energy is 51.64 kcal/mol, which accounts for about 35% of the available energy. Another photofragmentation channel is even more faster, whose peak in time-of-flight spectra corresponds to four or five photon absorptions. The branching ratio of these three channels is determined to be about 3: 3: 4.     

Ba+Cl_2,Br_2化学发光反应动力学研究——电子激发态BaCl_2~*的生成机理

本文在束-气化学反应装置中,研究了Ba+Cl_2(Br_2)化学发光反应,观测了BaCl_2~*(BaBr_2~*)连续发射和Ba(~1P→~1S)辐射强度与反应物浓度的关系,并用OMA观测了BaCl_2~*(BaBr_2~*)的发光强度的空间分布。实验结果否定了生成BaCl_2~*的单次碰撞的各种设想,通过形成高振动激发的电子基态中间产物的二步反应机理,成功地解释了实验观察的各项结果,证明这个机理是可信的。     

碘苯在266 nm激光作用下的碎片平动能谱

利用通用型交叉分子束装置测量了 2 6 6nm激光作用下碘苯的光致碎片化过程中产物碘原子的角分布及平动能分布 ,结果表明在所研究的激光强度 ( 10 8W/cm2 )下单光子反应与多光子过程之间存在着竞争 ,单光子解离反应为一慢速的预解离过程 ,各向异性参数被确定为 0 4左右 ,质心系的平均平动能只有 4 35 1kJ/mol,只有约 2 5 %的反应可资用能配置为产物的平动能 .而多光子碎片化过程为快速过程 ,其中的二光子过程的平均平动能为 2 16 .0 6 2kJ/mol,占反应可资用能的 35 %左右 ,另外一个主要的电离解离通道是一个更快的多光子过程 ,其最大峰值对应着四或五光子过程 ,三个通道的分支比约为 3∶3∶4