各位老师,大家好,最近看了个文献,做的是溶剂和晶面间的作用分析。在方法部分,有这样的描述:In all the simulations, the RDX surface was frozen along the a, b, and c directions, while the AC solvent could move freely。我想问的是,RDX面在abc方向被冻结,说的是和溶剂接触的那一层,还是所有的都冻结了(文中RDX有三层)?固定不同的层有什么讲究吗
Sobereva老师您好,对于臭氧分子高斯手册中有说它是典型的双自由基分子(两个成单电子自旋相反),我用"UCCSD(T)/aug-cc-pVTZ guess=mix stbale"命令在高斯09中检测它电荷为0自选多重度为1的波函数稳定性(已在相同计算水平下优化),结果显示The wavefunction has an internal instability,我的哪里出现问题了呢?请知道的老师帮帮我,谢谢!
A:
用stable=opt
guess=mix加U不代表总能收敛到基态的对称破缺波函数
Q:
谢谢老师!但是老师我想检测书上说的双自由基臭氧分子的波函数是否稳定,我用"UCCSD(T)/aug-cc-pVTZ guess=mix stable"检测过它电荷为0自选多重度为3的波函数,结果也是The wavefunction has an internal instability,用"RCCSD(T)/aug-cc-pVTZ guess=mix stable"检测过它电荷为0自选多重度为1的波函数,结果显示The wavefunction has an RHF -> UHF instability。我现在找不到任何一个stable检测结果稳定的波函数,所以想不通。
SOME ELEMENTS HAVE BEEN SPECIFIED FOR WHICH NO PARAMETERS ARE AVAILABLE. CALCULATION STOPPED. 这个在MOPAC 报错是什么原因(DATA ARE NOT AVAILABLE FOR ELEMENT NO. 77)[图片]77的C没什么问题啊?
A:
检查输入文件里的原子名
[图片]
Q:
输入文件: 77 C 28.49530000 * -8.57660000 * -0.92160000 *
请问 the effective zero-point averaged structure (rg0 structure) was computed from the cubic force field。 The cubic force field was evaluated through numerical differentiation of harmonic second derivatives within Gaussian。 这怎么理解?
All calculations were carried out using Density Functional Theory as implemented in the Jaguar 7.8 suite of ab initio quantum chemistry programs. Geometry optimizations were performed using the B3LYP functional and the 6-31G** basis set. (森略)For Cr, a modified version of LACVPS6,S7 was used, designated as LACV3P, in which the exponents were decontracted to match the effective core potential with triple-ζ quality.