### Abstract

Results of comprehensive full-dimensional (6D) quantum calculations of the rovibrational levels of (HCl)_{2}, for total angular momentum J = 0,1 are presented. The calculations employed two 6D potential energy surfaces (PES) - the ab initio PES of Bunker and co-workers, and the semiempirical PES of Elrod and Saykally. This 6D study provides the first rigorous, approximation-free description of the bound state properties of (HCl)_{2}, including the dissociation energy, tunneling splittings and their J, K dependence, frequencies of intermolecular vibrations and associated J = 0→1 spacings, and quantum number assignments of the 6D eigenstates. Detailed comparison with 4D bound state calculations (for fixed HCl bond length) was made in order to assess the importance of including the intramolecular vibrations of the two HCl subunits for accurate calculation of various spectroscopic properties of (HCl)_{2}. Comparison of the 6D results with experimental data, while confirming that the ES1 PES is substantially more accurate than the ab initio PES, shows that there is room for further refinements, preferably using 6D bound state calculations.

Original language | English (US) |
---|---|

Pages (from-to) | 2158-2170 |

Number of pages | 13 |

Journal | Journal of Chemical Physics |

Volume | 106 |

Issue number | 6 |

State | Published - Feb 8 1997 |

### Fingerprint

### ASJC Scopus subject areas

- Atomic and Molecular Physics, and Optics

### Cite this

*Journal of Chemical Physics*,

*106*(6), 2158-2170.

**Exact six-dimensional quantum calculations of the rovibrational levels of (HCl)2
.** / Qiu, Yanhui; Bacic, Zlatko.

Research output: Contribution to journal › Article

*Journal of Chemical Physics*, vol. 106, no. 6, pp. 2158-2170.

}

TY - JOUR

T1 - Exact six-dimensional quantum calculations of the rovibrational levels of (HCl)2

AU - Qiu, Yanhui

AU - Bacic, Zlatko

PY - 1997/2/8

Y1 - 1997/2/8

N2 - Results of comprehensive full-dimensional (6D) quantum calculations of the rovibrational levels of (HCl)2, for total angular momentum J = 0,1 are presented. The calculations employed two 6D potential energy surfaces (PES) - the ab initio PES of Bunker and co-workers, and the semiempirical PES of Elrod and Saykally. This 6D study provides the first rigorous, approximation-free description of the bound state properties of (HCl)2, including the dissociation energy, tunneling splittings and their J, K dependence, frequencies of intermolecular vibrations and associated J = 0→1 spacings, and quantum number assignments of the 6D eigenstates. Detailed comparison with 4D bound state calculations (for fixed HCl bond length) was made in order to assess the importance of including the intramolecular vibrations of the two HCl subunits for accurate calculation of various spectroscopic properties of (HCl)2. Comparison of the 6D results with experimental data, while confirming that the ES1 PES is substantially more accurate than the ab initio PES, shows that there is room for further refinements, preferably using 6D bound state calculations.

AB - Results of comprehensive full-dimensional (6D) quantum calculations of the rovibrational levels of (HCl)2, for total angular momentum J = 0,1 are presented. The calculations employed two 6D potential energy surfaces (PES) - the ab initio PES of Bunker and co-workers, and the semiempirical PES of Elrod and Saykally. This 6D study provides the first rigorous, approximation-free description of the bound state properties of (HCl)2, including the dissociation energy, tunneling splittings and their J, K dependence, frequencies of intermolecular vibrations and associated J = 0→1 spacings, and quantum number assignments of the 6D eigenstates. Detailed comparison with 4D bound state calculations (for fixed HCl bond length) was made in order to assess the importance of including the intramolecular vibrations of the two HCl subunits for accurate calculation of various spectroscopic properties of (HCl)2. Comparison of the 6D results with experimental data, while confirming that the ES1 PES is substantially more accurate than the ab initio PES, shows that there is room for further refinements, preferably using 6D bound state calculations.

UR - http://www.scopus.com/inward/record.url?scp=0031559108&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0031559108&partnerID=8YFLogxK

M3 - Article

VL - 106

SP - 2158

EP - 2170

JO - Journal of Chemical Physics

JF - Journal of Chemical Physics

SN - 0021-9606

IS - 6

ER -