Dissociation energy of diatomic molecules

We propose a modified potential energy function that is as easily used as the Hulburt-Hirschfelder (H-H) function. Dissociation energies have been estimated for MgO, CaO, and SrO and other molecules.     

用能量自洽法研究异核双原子分子的势能曲线

用研究双原子分子解析势能函数的新方法——ECM方法进一步研究了一些异核双原子分子的电子基态和激发态：CIF分子的A３Π1和B0＋(３Π)态，CH分子的X２Π态，BH分子的X1Σ＋态，XeO分子的d1Σ＋态，LaF分子的X1Σ＋态，Li7D分子的X1Σ＋态，NaRb分子的X1Σ＋态，KRb分子的(2)3Σ＋和21Π态等.获得的势能曲线表明，ECM势能很好地符合Rydberg-Klein-Rees(RKR)值，得到了比Morse势，huxley-Murrell-Sorbie(HMS)势更令人满意的结果.而且在分子渐近区和分子离解区域，ECM方法还能得到RKR可能缺乏的可靠物理数据. 关键词： 能量自洽 双原子分子 势能函数 电子态     

双荷电双原子分子的新解析势能函数

提出了能更好反映双荷电双原子分子势能曲线特点的新解析势能函数，并推导出了相应的二、三、四阶力常数计算公式；作为新函数的应用实例，给出了BH2+, He22+ 和HF2+等分子离子的解析势能函数，力常数和光谱数据。     

氢化物双原子分子势能曲线的能量自洽法研究

使用能量自洽法较系统地研究了部分氢化物及其同位素双原子分子的一些电子基态和激发态的势能：NaH，RbH分子的X1Σ+态，同位素分子HF和DF，H35Cl和D35Cl，6LiH，6LiD和7LiH的Ｘ１Σ+态，BH分子的a3Π,b3Σ-激发态，CH分子的A2Δ激发态和BeH分子的A2Π激发态.不仅得到了与基于实验的Rydberg-Klein-Rees势能或Inverted Perturbation Approach值或Configuration Interaction理论数据符合得很好的势能，而且获得了其他 关键词： 能量自洽 势能函数 氢化物     

用李代数方法构造四原子分子的势能面

把李代数方法得到的四原子分子的代数Hamiltonian，利用相干态经典化之后并找到一个新的变换，将分子的键角引入，而得到四原子分子的势能面.由该势能面计算得到的解离能与力常数与其他方法给出的一致.     

Dissociation of vertical semiconductor diatomic artificial molecules

We investigate the dissociation of few-electron circular vertical semiconductor double quantum dot artificial molecules at 0 T as a function of interdot distance. A slight mismatch introduced in the fabrication of the artificial molecules from nominally identical constituent quantum wells induces localization by offsetting the energy levels in the quantum dots by up to 2 meV, and this plays a crucial role in the appearance of the addition energy spectra as a function of coupling strength particularly in the weak coupling limit.     

A new four-parameter empirical potential energy function for diatomic molecules

A new empirical four-parameter function is proposed for the construction of potential curves of 15 stable states of diatomic molecules. The parameters are evaluated in terms of experimentally known spectroscopic constants. On comparing its performance with other functions, the proposed function is found to be simple and reliable for a wide range of molecules.      

New method for the evaluation of the RKR potential-integrals for diatomic molecules

We present a new method for the evaluation of the RKR potential-integrals for diatomic molecules. This method is straightforward and fast, and the calculations can be performed to an accuracy better than any other method.     

用代数能量方法研究氢化物双原子分子的完全振动能谱和离解能

本文用研究双原子分子振动能谱的新方法-代数方法(AM),研究了KH-X1Σ+,RbH-X1Σ+,DF-X1Σ+和DCl-X1Σ+等四个氢化物双原子分子的电子基态的振动光谱常数和振动能谱;用代数能量方法(AEM)研究了相应电子态的分子离解能.研究结果表明:使用实验获得的少数精确的振动能级[Eυ],由AM方法得到的振动能谱不仅能够重复这些电子态的已知实验能级,还能够得到用现代实验方法或精确的量子理论方法很难得到的所有高振动激发态的能级.由AEM方法能够得到比用文献发表的振动光谱常数计算获得的离解能值更准确的分子离解能.     

Estimation of dissociation energy of NiC molecule

The experimental potential-energy curve for the electronic ground state of an astrophysically important NiC molecule is constructed by applying the Rydberg-Klein-Rees method as modified by Vanderslice et al. The ground state dissociation energy is estimated by a curve-fitting technique using the modified Lippincott potential function, and this estimated value of is in good agreement with the value of reported by Brugh and Morse.     

An extended Lennard-Jones potential energy function for diatomic molecules: Application to ground electronic states

A new simple analytical diatomic potential energy function that can be considered an extension of the prototypical Lennard-Jones model is proposed and tested. Five- and six-parameter models are considered and these can be easily constructed from widely available low-order vibrational-rotational constants and the dissociation energy. Accuracy tests are carried out on the ground electronic states of sixteen diatomic molecules. The proposed six-parameter function is found to be more accurate than other available few-parameter analytical models for the diatomic potential energy, and has accuracy comparable to that of modern high-level ab initio functions.     

用代数-能量自洽法研究双原子分子解析势能函数

基于计算双原子分子完全振动能谱及离解能的代数方法 (algebraic method,AM)和研究双原子分子解析势能函数的能量自洽法(energy consistent method,ECM),建立了计算双核分子体系精确解析势能函数的代数-能量自洽法(AM-ECM).应用AM-ECM方法研究了7Li+2-23Σg,KH-X1Σ+,NaLi-X1Σ+和NaLi-A1Σ+电子态的解析势能表达形式,并与其他方法的研究结果进行了比较,获得了能正确描述这些电子态在渐近区和离解区的精确解析表达结果.     

Further Dunham energy coefficients of diatomic molecules

Expressions are given for the Dunham energy coefficients Y₃₃ and Y₄₂ in terms of the potential energy coefficients a_i, for diatomic molecules. Their use is briefly discussed.     

同核双原子分子离子的势能研究

使用作者最近建立的研究双原子分子离子精确势能的离子能量自洽法(ECMI),对碱金属、氟、氧的同核双原子分子离子的以下电子态进行了研究:Na2 的X2∑g 态,Li2 的X2∏u态,F2 的A2Пu态,F2 的X2∏g,和O2 的A2∏u态.将获得的ECMI势能曲线与用其他理论方法得到的势能曲线进行的比较表明,ECMI得到了这些态的最好势能,而且ECMI势不仅能获得平衡核间距附近的精确势能,还能得到其他方法往往难以得到的双原子分子离子渐进区和离解区的正确势能.     

双原子分子激发态势能的自旋相关局域Hartree-Fock密度泛函理论方法

基于自旋相关局域Hartree-Fock (SLHF)势函数,本文提出了一种计算双原子分子激发态势能的密度泛函理论(DFT)方法,并将该方法应用于和的激发态势能曲线的计算。在只考虑交换能的情况下,本文的DFT计算结果与文献中精确方法和Hartree-Fock (HF)方法的结果符合的非常好,说明采用SLHF势函数作为交换势的DFT方法是一个很好的计算激发态势能的方法。本文还计算和探讨了电子的关联势函数和关联能,发现传统的近似方法在较大核间距的情况下大大低估了电子的关联能.     

The true potential energy curves for different states of SiO and SiS molecules

The true potential energy curves forX ¹ Σ ⁺, a³ π _r,A ¹ π,e ³ Σ ⁻,E ¹ Σ ⁺,c ³ π _i states of astrophysically important molecule SiO, whose spectra were observed in the sunspots, have been constructed using the method of Lakshman and Rao. Dissociation energy and ionization potential have been estimated as 65,350 cm⁻¹ and 92,854 cm⁻¹ respectively and found to be in good agreement with the values cited in literature. The true potential energy curves forX ¹ Σ ⁺,D ¹ π andE ¹ Σ ⁺ states of SiS molecule have been constructed by the same method and its dissociation energy in the ground state has been estimated using Hulburt-Hirschfelder potential function as 54,765 cm⁻¹ in good agreement with 53,250.9 cm⁻¹ given by Herzberg.     

双原子分子非谐振转波函数和能级

从双原子分子简谐势近似波函数出发,运用微扰理论计算出了双原子分子在非谐振转相互作用下的一级、二级近似能级和一级近似波函数.     

PuNO分子结构与势能函数

本文运用密度泛函理论的B3LYP方法, 对钚原子应用LANL2DZ收缩价基函数, 氮、氧原子采用AUG-cc-pVTZ基函数, 分别对PuN, PuO, NO和PuNO体系进行了结构优化, 得到PuNO分子最稳构型为C_∞v (Pu-N-O), 电子态为⁶Σ^- (基态), 平衡核间距R_ON=0.12257 nm, R_NPu=0.22951 nm, 离解能D_e=8.10537 eV. 同时优化得到PuNO 分子存在两种亚稳态平衡构型分别为C_∞v (Pu-O-N), ⁶Σ^- (电子态)和C_s (O-Pu-N), A" (电子态), 以及分子体系相应的力学常数等. 拟合出PuN, PuO 和NO 分子的Murrell-Sorbie势能函数, 并使用多体项展式理论得到了PuNO分子的分析势能函数, 其等值势能图准确再现了PuNO分子最稳态构型及两个亚稳态构型的离解能和结构特性, 由此讨论了该分子体系的势能面静态特征.     

双原子分子激发态转动传能量子干涉效应模型

物质波的干涉是由于微观粒子具有波的特性而产生的干涉现象。对于双原子分子单三重混合态转动传能过程具有波动特性,两个通道间存在量子干涉效应。基于玻恩近似的微扰理论,本文利用各向异性相互作用势和直线轨迹近似给出了包含干涉相位角的干涉表达式,建立了新的量子干涉模型,并讨论了此模型中利用的近似理论。