ALGEBRAIC METHOD FOR VIBRATIONAL ENERGY SPECTRA OF H_2O AND NO_2

文内提出一种研究Ｈ２Ｏ和ＮＯ２高激发伸缩振动的Ｕ（２）代数模型，在极限条件下，该模型退化为一种非谐和耦合的局域模模型，用该模型的六个可调参数拟合实验数据，算得的标准偏差比相应的非谐和耦合的局域模型算得的偏差要小  

Algebraic Hamiltonian for Vibrational Spectra of Stibine

An algebraic Hamiltonian, which in a limit can be reduced to an extended local mode model by Law and Duncan, is proposed to describe both stretching and bending vibrational energy levels of polyatomic molecules, where Fermi resonances between the stretches and the bends are considered. The Hamiltonian is used to study the vibrational spectra of stibine (SbH3). A comparison with the extended local mode model is made. Results of fitting the experimental data show that the algebraic Hamiltonian reproduces the observed values better than the extended local mode model.  

用代数方法研究H2O和NO2的振动能谱

文内提出一种研究Ｈ２Ｏ和ＮＯ２高激发伸缩振动的Ｕ（２）代数模型，在极限条件下，该模型退化为一种非谐和耦合的局域模模型，用该模型的六个可调参数拟合实验数据，算得的标准偏差比相应的非谐和耦合的局域模型算得的偏差要小。  

Entanglement and decoherence in a quantum dimer

The dynamical properties of quantum entanglement in an integrable quantum dimer are studied in terms of the reduced-density linear entropy with various coupling parameters and total boson numbers. The characteristic time of decoherence process in the early-time evolution of the linear entropy is obtained, indicating that the characteristic time and the corresponding entropy exhibit a maximum near the position of the corresponding classical separatrix energy.  

费密共振和甲烷的振动能谱

用局域模模型来解释甲烷的伸展和弯曲振动能谱，其中伸展振动和弯曲振动间的相互作用用费密共振项来描写，它由一个伸展振子的玻色产生（或湮没）算子和两个弯曲振子的玻色湮没（或产生）算子乘积的T_d不变组合构成．这模型包含10个参数，与已发表的甲烷振动能谱的实验数据比较，得到能量的方均根偏差为12.38cm^－1．  

代数方法计算正四面体分子伸缩振动能谱

用推广的U(2)代数模型，对正四面体分子的伸缩振动能谱进行了理 论研 究，该模型成功地应用到SnD4的最新观测到的高分辨能谱数据，所得计算值与实验值的标 准偏差是0.124 cm-1。  

用代数模型研究非刚性HCP分子的振动谱

提出一种研究非刚性HCP分子的高激发非线性振动的代数哈米顿量,它在极限条件下退化为传统的用谐振子算子表示的模型,拟合观测的实验数据表明,代数模型比传统模型较好地描述了这些数据．  

H2O分子OH键振动能谱的代数计算

用U(2)代数模型，对H2O分子OH键的高激发振动能谱进行了理论计算，并与其它模型的计算相比较，结果表明，代数模型能以较小的标准偏差描述这一分子OH键的振动能谱。  

Vibrational spectra and intramolecular vibrational redistribution in methane and its isotopomers

An improved U(2) algebraic model is introduced to study the stretching and bending vibrational spectra of methane and its isotopomers.The algebraic model with fewer parameters reproduces the experimental spectra with good precision.Moreover,the obtained parameters describe well the correct behavior of isotopic substitution.It is shown that the Fermi resonance leads to a very fast intramolecular vibrational redistribution among stretches and bends.  

用两耦合非线性振子模型研究量子纠缠和相干性

我们研究两耦合非线性振子模型的量子纠缠和量子相干动力学, 结果表明在适当条件下, 纠缠熵与相干度是正相关的. 我们也讨论纠缠熵和相干度与两振子子相互作用能的联系.