首页> 外文期刊>The journal of physical chemistry, A. Molecules, spectroscopy, kinetics, environment, & general theory >Spectroscopic Constants of Single-Bond Diatomic Molecules and Singlet-Triplet Gaps of Diradicals by the Block-Correlated Coupled Cluster Theory
【24h】

Spectroscopic Constants of Single-Bond Diatomic Molecules and Singlet-Triplet Gaps of Diradicals by the Block-Correlated Coupled Cluster Theory

机译:块相关耦合簇理论的双键单键双原子分子和单重态三重态隙的光谱常数

获取原文
获取原文并翻译 | 示例
           

摘要

The spatial orbital formulations of block-correlated coupled cluster(BCCC)theory with a complete active-space self-consistent-field(CASSCF)reference function and its efficient implementation is presented.In the present implementation,the cluster operator is truncated to the four-block correlation level,and the CASSCF(2,2)reference function is assumed(thus,the method is abbreviated as CAS-BCCC4).We have applied this method to investigate the spectroscopic constants in seven single-bond diatomic molecules(LiH,HF,HC1,Li2,F2,C1F,and Cl2)and the singlet-triplet gaps in a series of typical diradicals,including carbon,oxygen,and silicon atoms,methylene(CH2)and its isovalent species(NH_2~+,SiH2,and PH_2~+),and three benzyne isomers.A comparison of our results with the experimental data or other theoretical estimates shows that the present approach can provide quantitative descriptions for all of the studied systems.
机译:提出了具有完整主动空间自洽场(CASSCF)参考函数的块相关耦合簇(BCCC)理论的空间轨道公式及其有效实现。在本实现中,将簇算子简化为四个嵌段相关水平,并假设使用CASSCF(2,2)参考函数(因此,该方法缩写为CAS-BCCC4)。我们已将该方法用于研究七个单键双原子分子(LiH, HF,​​HC1,Li2,F2,C1F和Cl2)和一系列典型的双自由基(包括碳,氧和硅原子),亚甲基(CH2)及其等价物质(NH_2〜+,SiH2,我们的结果与实验数据或其他理论估计值的比较表明,本方法可以为所有研究的系统提供定量描述。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱:kefu@zhangqiaokeyan.com

京公网安备:11010802029741号 ICP备案号:京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有
  • 客服微信

  • 服务号