共查询到18条相似文献,搜索用时 62 毫秒
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利用单光子激光诱导荧光技术,在硝基甲烷与硝基乙烷气相条件下266 nm光解过程中,对初生态的解离产物OH进行了测量.结果表明,两个解离过程中产生的初生态OH都没有振动激发.硝基甲烷光解过程中产生的OH的转动分布可以用玻尔兹曼温度简单的表示,相对于自旋轨道分裂的2|3=2与2|1=2两个态,其转动温度分别为2045§150与1923§150 K.硝基乙烷光解过程中产生的OH不是简单的玻尔兹曼分布,因此不能用玻尔兹曼温度来描述,这一结果
意味着硝基甲烷与硝基乙烷在生成OH的过程中经历了不同的解离过程.硝基甲烷 相似文献
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本文报导光解苯半醌自由基在不同溶液浓度、微波功率与激光能量的实验条件下电子自旋极化的时间演化研究。研究了在实验中出现的极化转相现象和溶液浓度对极化强度与自由基寿命的影响,并对实验结果进行了讨论。 相似文献
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光解苯半醌自由基的CIDEP谱 总被引:1,自引:0,他引:1
用高时间分辨ESR谱仪实验给出了光解对苯醌产生的苯半醌自由基的CIDEP发射谱.用三重态机理,同时考虑了自由基对机理的影响,从理论上分析了极化强度,计算出了增强因子V(Ⅰ)=-0.66,V(R)=0.2,一级反应速率k1,A=0.05/μs,二级反应速率β=0.02/μs,横向和纵向弛豫时间T1≈T2=2.3μs. 相似文献
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激光聚变靶物理研究用激光强率I随空间的变化来反映激光能量的沉积。目前激光靶物理研究使用的激光能量沉积方程在临界面处发散,讨论了造成这一非物理结果的原因,给出了合理的激光强度方程,并讨论了新旧两种激光强度方程对激光吸收的影响。 相似文献
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安息香激光光解的CIDNP研究 总被引:1,自引:1,他引:0
采用Nd/YAG激光器的三倍频激光脉冲(355nm),研究了安息香的激光光解过程及其CIDNP效应,获得了不同动力学参数d9下的CIDNP谱,由此对预测的反应机理作出了证实.通过自编程序,根据对两种光反应产物不同形成途径的CIDNP模拟谱的计算,对安息香光解过程CIDNP效应芳环上质子的极化情况作出了合理归属. 相似文献
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利用激光诱导荧光光谱方法研究了对氨基苯甲酸在266 nm条件下光解生成的OH自由基的高分辨振转光谱. 研究发现OH自由基几乎处于振动基态并且它的转动布居符合波尔兹曼分布,转动温度可表征为1040±110 K,相对应的转动能为8.78±0.84 kJ/mol.在2Π3/2和2Π1/2旋轨耦合态中,前者布居占多数;并且Λ分裂态的Π(A′)态占优. 最后讨论了OH自由基来自对氨基苯甲酸光解可能的解离机理. 相似文献
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We have solved the time dependent Schrödinger equation by using the Chebyshev polynomial scheme and Fourier grid Hamiltonian method to calculate the dissociation cross section of NaH molecule by 1-photon absorption from the X 1Σ+ state to the B 1Π state. We have found that the results differ significantly from an earlier calculation [1] although we have used the same set of potential energy curves [2]. 相似文献
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Rongrong Zhang Ahmed Yousif Ghazal Yuzhu Liu Yan Zhang Bifeng Tang 《Optics Communications》2009,282(11):2169-6193
The photodissociation dynamics of iodocyclohexane (C6H11I) at 266 and 277 nm has been investigated by ion velocity imaging technique. The velocity distributions, angular distributions and relative quantum yields are obtained for I (2P3/2) (denoted I) and I (2P1/2) (denoted I*) fragments. The energy partitioning shows that about 70% of the available energy goes into the internal excitation of the photofragments for both dissociation channels. From the angular distributions, we found the value of the anisotropy parameter β for I* at the corresponding excitation wavelength was less than that for I. Based on the measured angular distributions and relative quantum yields, the relative fractions of each excited state to the products are determined. The curve crossing probabilities between the 3Q0 and 1Q1 states are determined 0.503 at 266 nm and 0.443 at 277 nm. 相似文献
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本文主要描述小分子在真空紫外波段(VUV,6-20 eV)光解离动力学的最新实验和理论研究进展.得益于基于商业化激光器的真空紫外光源技术,以及离子速度成像、高分辨氢原子-里德堡态标记-飞行时间测量和VUV-VUV泵浦-探测等方法的发展,研究人员现在可以对很多小分子在真空紫外波段的光解离动力学进行量子态到量子态层面的测量和研究,本文重点综述H_2(D_2,HD),CO,N_2,NO,O_2,H_2O(D_2O,HOD),CO_2,N_2O以及一些多原子分子在真空紫外波段光解离动力学的最新研究进展.这些小分子在真空紫外波段的光解离在天体化学以及大气化学中有着非常重要的应用.分子吸收一个VUV光子以后,通常会被直接激发到比较高的电子激发态,解离过程会涉及到多个电子态势能面之间的复杂非绝热相互作用.在实验上对解离截面等参数进行从量子态到量子态层面的精细测量对于深入了解这些复杂的势能面之间的相互作用有非常重要的意义.最近建成的大连相干光源是目前世界上唯一一台在真空紫外波段工作的自由电子激光,具有脉冲能量高、扫描范围宽(50~150 nm)等优越的性能,它的建成必将会大大促进小分子真空紫外光解离研究的发展. 相似文献
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研究Cs(62P)+He(Ar)+nhν→Cs(92D)+He(Ar)+(n-1)hν过程,激光频率调到Cs9D3/2→6P1/2跃迁谱线的蓝翼20~100cm-1,测量了精细结构谱线强度分支比I(9D3/2→6P3/2)/I(9D5/2→6P3/2)。实验表明,原子相互作用势和非绝热效应在离解动力学中起关键作用。 相似文献
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The S(1D2)+CO(X1Σ+) product channel from photodissociation of OCS at 217 nm has been measured using the DC slice velocity map imaging (VMI) technique in combination with resonance enhanced multiphoton ionization (REMPI). Two diflerent REMPI intermediate states (1F3 and 1P1) and several pump-probe laser polarization geometries are used to detect the angular momentum polarization of the photofragmented S(1D2). The molecular- frame polarization parameters, as well as the laboratory-frame anisotropy parameters, for individual rotational states of co-fragment CO, are determined using two diflerent full quantum theories. The measured total kinetic energy release spectrum from photodissociation of OCS indicates two dissociation channels, corresponding to the fast and slow recoiling velocities of S(1D2), respectively. The slow channel is concluded to originate from an initial photoexcitation to the A(1A'') state, followed by a non-adiabatic transition to the ground state. The fast channel is found to follow a coherent excitation to A(1A'') and B(1A'') states, where contributions of the two states are almost equal at 217 nm. The determined alignment and anisotropy parameters further indicate that the slow channel follows an incoherent excitation, while the fast channel follows a coherent excitation to A(1A'') and B(1A'') states with a phase di erence of π/2. 相似文献