共查询到20条相似文献,搜索用时 281 毫秒
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我们利用非绝热相关方法 ,通过关闭所有的振动模式间的耦合项并追溯到零级本征态 ,以得到体系的形式量子数 ,将形式量子数对高激发振动态的能级谱图进行归属 ,并重构本征能级图谱 ,使本征能级以有序的方式排列。这有助于对高激发振动态的能级进行分类和归属。形式量子数是体现高激发振动态的重要特征 ,是高激发振动态的近似运动守恒量。我们将多维陪集相空间的经典方法应用于高激发态的研究 ,发现形式量子数对应的李雅普诺夫指数为零或最小 ,并且它对应于较大的相空间密度 相似文献
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本论文对Ne-Xe体系的势能曲线和束缚态能级作了系统的研究.采用耦合簇CCSD(T)方法和超分子近似,以及aug-cc-PVXZ(X=T,Q,5)基组,计算了Ne-Xe体系的相互作用势,并采用三种方案外推得到基底限值,给出了不同基底和外推方法下的势能曲线平衡位置和势阱深度.计算了Ne-Xe体系振转能级和各同位素基振动态的纯转动跃迁频率,及相应的光谱常数,并与实验结果进行了比较. 相似文献
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对双原子分子体系内部相互作用势作了物理分析与比较,引用Murrell-Sorbie势.然后应用泰勒微扰理论.将M-S势函数泰勒展开,并取至4次方项,建立了相应的定态薛定谔方程.然后用三维谐振子势能量表象的径向矩阵对角元的简要形式,简易有效地求得一级微扰能量,进而获得双原子分子体系振-转能级的解析形式.其某些低能级和光谱的理论值与实验结果相符. 相似文献
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粒子在 Hénon-Heiles势中的逃逸动力学模拟 总被引:1,自引:1,他引:0
利用庞加莱截面和相空间轨迹方法对粒子在Hénon-Heiles势中的逃逸动力学进行了模拟.粒子的动力学性质敏感地依赖于粒子的能量.数值计算表明当能量很小时,粒子的运动是规则的;随着能量的增加,粒子的运动开始出现混沌.当能量增加到鞍点能Es时,几乎所有的相空间轨迹都是混沌的.当粒子的能量E>Es,粒子可以越过势阱发生逃逸.对于给定的大于Es的能量, 我们画出了粒子的逃逸-时间曲线和逃逸轨迹.我们的研究对于研究混沌传输和逃逸动力学具有一定的参考价值. 相似文献
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分子高激发振动态的理论研究 总被引:1,自引:1,他引:0
简要综述了分子高激发振动态的理论研究方法和研究进展.介绍了李代数方法在高激发振动态能级的归属和分类、分子高激发振动态动力学以及分子内振动能量弛豫和分子解离等方面的应用.随后,作者对分子高激发振动态研究领域今后的发展方向作了展望. 相似文献
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在李代数动力学群得到Hamiltonian的基础上,通过求解正则运动方程.对固定键角近似下臭氧分子体系相空间的庞加莱截面、KAM环面以及振动体系的能量属性进行了研究,获得了有关臭氧分子振动体系丰富的动力学信息. 相似文献
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H. Crogman V. Boudon D. A. Sadovskií 《The European Physical Journal D - Atomic, Molecular, Optical and Plasma Physics》2007,42(1):61-72
We define stretching relative equilibria (RE) of silane and other similar
tetrahedral molecules in terms of the dynamical polyad symmetry which
assumes the resonance condition 1:1 between the two stretching
vibrational modes ν1 and ν3 of the molecule. Exploiting symmetry
and topology arguments and reducing the dimension of the classical
mechanical system, we find these RE. One of them, with local symmetry
C3v and minimal energy within a polyad, corresponds to the local
modes. We give the upper energy limit of the local mode localization within
a polyad. 相似文献
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Bending localization of nitrous oxide under anharmonicity and Fermi coupling: the dynamical potential approach 下载免费PDF全文
This paper studies the vibrational nonlinear dynamics of nitrous oxide with Fermi coupling between the symmetric stretching and bending coordinates by classical dynamical potential approach.This is a global approach in the sense that the overall dynamics is evidenced by the classical nonlinear variables such as the fixed points and the focus are on a set of levels instead of individual ones.The dynamics of nitrous oxide is demonstrated to be not so much dependent on the excitation energy.Moreover,the localized bending mode is shown to be ubiquitous in all the energy range studied. 相似文献
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The highly excited vibrational levels of HCO in the electronic
ground state, \tilde {X}1A',are employed to determine the
coefficients of an algebraic Hamiltonian, by which the dynamical
potential is derived and shown to be very useful for interpreting
the intramolecular vibrational relaxation (IVR) which operates via
the HCO bending motion. The IVR inhibits the dissociation of H atom
and enhances the stochastic degree of dynamical character. This
approach is from a global viewpoint on a series of levels classified
by the polyad number which is a constant of motion in a certain
dynamical domain. In this way, the seemingly complicated level
structure shows very regular picture, dynamically. 相似文献
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The intramolecular vibrational dynamics due to extremely irrational
couplings is demonstrated by contrast to the resonance couplings, for
the three-mode case of H分子物理学 分子内振动弛豫 甚高频无理耦合 共鸣 振动动力学 intramolecular vibrational relaxation, extremely
irrational couplings, resonance Project supported by the National Natural
Science Foundation of China
(Grant No~20373030) and the Foundation for Key Program
of Ministry of Education, China
(Grant No~306020) and the Specialized Research Fund for the Doctoral Program of
Higher Educatio 2007-03-04 The intramolecular vibrational dynamics due to extremely irrational couplings is demonstrated by contrast to the resonance couplings, for the three-mode case of H2O as an example. The extremely irrational couplings are shown to impose such strong hindrance to intramolecular vibrational relaxation (IVR) that they act as barriers. They restrict the direct action/energy transfer between the two stretching modes, though they allow the transfer between a stretching and a bending modes. In contrast, the resonance is more mediated by the bending mode and leads to chaotic IVR. It is also shown that there is a region in the dynamical space in which resonance and extremely irrational couplings coexist. 相似文献
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Global dynamical analysis of vibrational manifolds of HOCl and HOBr under anharmonicity and Fermi resonance: the dynamical potential approach 下载免费PDF全文
The vibrational dynamics of HOCl and HOBr between
bending and OCl/OBr stretching coordinates with anharmonicity and
Fermi coupling is studied with the classical dynamical potential
approach. The quantal vibrational dynamics is mostly mapped out by
the classical nonlinear variables such as fixed points, except for
the state energies, which are quantized. This approach is global in
the sense that the focus is on a set of levels instead of individual
ones. The dynamics of HOBr is demonstrated to be less complicated.
The localized modes along the OCl/OBr stretching coordinates are
also shown to have O--Br bonds more prone to dissociation. 相似文献
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High-order harmonic generation of CO_2 with different vibrational modes in an intense laser field 下载免费PDF全文
We apply the strong-field Lewenstein model to demonstrate the high-order harmonic generation of CO_2 with three vibrational modes(balance vibration,bending vibration,and stretching vibration) driven by an intense laser field.The results show that the intensity of harmonic spectra is sensitive to molecular vibrational modes,and the high harmonic efficiency with stretching vibrational mode is the strongest.The underlying physical mechanism of the harmonic emission can be well explained by the corresponding ionization yield and the time-frequency analysis.Finally,we demonstrate the attosecond pulse generation with different vibrational modes and an isolated attosecond pulse with a duration of about 112 as is generated. 相似文献
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Hydrogen atoms adsorbed on Si(111) and Pt(111) were investigated by nuclear reaction analysis (NRA) using 1H(15N,alphagamma)12C. From measurements of the NRA spectrum at normal and tilted ion incidences the zero-point vibrational energies of H on Si(111) in the perpendicular and parallel directions were found to be 123.4+/-4.6 and 44.6+/-6.2 meV, respectively, which are consistent with harmonic potentials. The zero-point energies obtained for Pt(111)-H were 80.8+/-3.9 and 62.1+/-6.0 meV for perpendicular and parallel directions, respectively. These results indicate that the stretching mode is harmonic, while the bending mode is strongly anharmonic. 相似文献
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利用高精度的非绝热从头算势能面,采用量子实波包方法研究了D2O在3个不同初始振动态(0,1,0)、(1,0,0)和(0,0,1)下光激发到~B态解离过程的态-态量子动力学.结果表明,由于初始振动波函数的形状不同,从不同振动态产生的吸收光谱、产物分布和产物分支比具有不同的动力学特性.弯曲振动态(010)的吸收谱呈现出两波瓣的形状且中间具有较浅的极小值,其基态产物OD( ~X)在高能量区域会出现轻微的振动态反转现象.所有初始振动态得到的激发态产物OD(?)的振-转态分布都随能量的变化出现强烈的震荡,这是由于受到了激发态势能面上长寿命共振态的影响.反对称伸缩振动态(0,0,1)在高能量区域具有较大的产物分支比OD(?)/OD( ~X),表明绝热通道在某些情形下是主要的解离通道. 相似文献
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Time-evolution of the vibrational states of two interacting harmonic oscillators in the local mode scheme is presented. A local-to-normal mode transition (LNT) is identified and studied from temporal perspective through time-dependent frequencies of the oscillators. The LNT is established as a polyad-breaking phenomenon from the local standpoint for the stretching degrees of freedom in a triatomic molecule. This study is carried out in the algebraic representation of bosonic operators. The dynamics of the states are determined via the solutions of the corresponding nonlinear Ermakov equation and a local time-dependent polyad is obtained as a tool to identify the LNT. Applications of this formalism to H2O, CO2, O3 and NO2 molecules in the adiabatic, sudden and linear regime are considered. 相似文献