中国物理B ›› 2016, Vol. 25 ›› Issue (5): 53101-053101.doi: 10.1088/1674-1056/25/5/053101

• ATOMIC AND MOLECULAR PHYSICS • 上一篇    下一篇

Accurate double many-body expansion potential energy surface of HS2(A2A') by scaling the external correlation

Lu-Lu Zhang(张路路), Yu-Zhi Song(宋玉志), Shou-Bao Gao(高守宝), Yuan Zhang(张媛), Qing-Tian Meng(孟庆田)   

  1. School of Physics and Electronics, Shandong Normal University, Jinan 250014, China
  • 收稿日期:2015-12-22 修回日期:2016-01-25 出版日期:2016-05-05 发布日期:2016-05-05
  • 通讯作者: Yu-Zhi Song, Qing-Tian Meng E-mail:yzsong@sdnu.edu.cn;qtmeng@sdnu.edu.cn
  • 基金资助:

    Project supported by the National Natural Science Foundation of China (Grant No. 11304185), the Taishan Scholar Project of Shandong Province, China, the Shandong Provincial Natural Science Foundation, China (Grant No. ZR2014AM022), the Shandong Province Higher Educational Science and Technology Program, China (Grant No. J15LJ03), the China Postdoctoral Science Foundation (Grant No. 2014M561957), and the Post-doctoral Innovation Project of Shandong Province, China (Grant No. 201402013).

Accurate double many-body expansion potential energy surface of HS2(A2A') by scaling the external correlation

Lu-Lu Zhang(张路路), Yu-Zhi Song(宋玉志), Shou-Bao Gao(高守宝), Yuan Zhang(张媛), Qing-Tian Meng(孟庆田)   

  1. School of Physics and Electronics, Shandong Normal University, Jinan 250014, China
  • Received:2015-12-22 Revised:2016-01-25 Online:2016-05-05 Published:2016-05-05
  • Contact: Yu-Zhi Song, Qing-Tian Meng E-mail:yzsong@sdnu.edu.cn;qtmeng@sdnu.edu.cn
  • Supported by:

    Project supported by the National Natural Science Foundation of China (Grant No. 11304185), the Taishan Scholar Project of Shandong Province, China, the Shandong Provincial Natural Science Foundation, China (Grant No. ZR2014AM022), the Shandong Province Higher Educational Science and Technology Program, China (Grant No. J15LJ03), the China Postdoctoral Science Foundation (Grant No. 2014M561957), and the Post-doctoral Innovation Project of Shandong Province, China (Grant No. 201402013).

摘要:

A globally accurate single-sheeted double many-body expansion potential energy surface is reported for the first excited state of HS2 by fitting the accurate ab initio energies, which are calculated at the multireference configuration interaction level with the aug-cc-pV QZ basis set. By using the double many-body expansion-scaled external correlation method, such calculated ab initio energies are then slightly corrected by scaling their dynamical correlation. A grid of 2767 ab initio energies is used in the least-square fitting procedure with the total root-mean square deviation being 1.406 kcal· mol-1. The topographical features of the HS2(A2A') global potential energy surface are examined in detail. The attributes of the stationary points are presented and compared with the corresponding ab initio results as well as experimental and other theoretical data, showing good agreement. The resulting potential energy surface of HS2(A2A') can be used as a building block for constructing the global potential energy surfaces of larger m S/H molecular systems and recommended for dynamic studies on the title molecular system.

关键词: potential energy surface, ab initio calculation, HS2, transition state

Abstract:

A globally accurate single-sheeted double many-body expansion potential energy surface is reported for the first excited state of HS2 by fitting the accurate ab initio energies, which are calculated at the multireference configuration interaction level with the aug-cc-pV QZ basis set. By using the double many-body expansion-scaled external correlation method, such calculated ab initio energies are then slightly corrected by scaling their dynamical correlation. A grid of 2767 ab initio energies is used in the least-square fitting procedure with the total root-mean square deviation being 1.406 kcal· mol-1. The topographical features of the HS2(A2A') global potential energy surface are examined in detail. The attributes of the stationary points are presented and compared with the corresponding ab initio results as well as experimental and other theoretical data, showing good agreement. The resulting potential energy surface of HS2(A2A') can be used as a building block for constructing the global potential energy surfaces of larger m S/H molecular systems and recommended for dynamic studies on the title molecular system.

Key words: potential energy surface, ab initio calculation, HS2, transition state

中图分类号:  (Ab initio calculations)

  • 31.15.A-
31.15.ae (Electronic structure and bonding characteristics) 31.50.Bc (Potential energy surfaces for ground electronic states)