Molecular structure and analytical potential energy function of SeCO

doi:10.1088/1674-1056/23/9/093101

Abstract The density functional method (B3P86/6-311G) is used for calculating the possible structures of SeC, SeO, and SeCO molecules. The result shows that the ground state of the SeC molecule is ¹Σ, the equilibrium nuclear distance is R_SeC=0.1699 nm, and the dissociation energy is D_e=8.7246 eV. The ground state of the SeO molecule is ³Σ, with equilibrium nuclear distance R_SeO=0.1707 nm and dissociation energy D_e=7.0917 eV. There are two structures for the ground state of the SeCO molecule: Se=C=O and Se=O=C. The linear Se=C=O is ¹Σ. Its equilibrium nuclear distances and dissociation energy are R_SeC=0.1715 nm, R_CO=0.1176 nm and 18.8492 eV, respectively. The other structure Se=O=C is ¹Σ. Its equilibrium nuclear distances and dissociation energy are R_CO=0.1168 nm, R_SeO=0.1963 nm and 15.5275 eV, respectively. The possible dissociative limit of the SeCO molecule is analyzed. The potential energy function for the SeCO molecule has been obtained from the many-body expansion theory. The contour of the potential energy curve describes the structure characters of the SeCO molecule. Furthermore, contours of the molecular stretching vibration based on this potential energy function are discussed.

Keywords: SeCO molecular structure potential energy

Received: 07 December 2013
Revised: 10 March 2014
Accepted manuscript online:

PACS:	31.15.B-	(Approximate calculations)
	31.50.-x	(Potential energy surfaces)
	33.15.Dj	(Interatomic distances and angles)

Corresponding Authors: Yan Shi-Ying
E-mail: ysy5954418@163.com

Cite this article:

Zhang Heng (张恒), Tian Duan-Liang (田端亮), Yan Shi-Ying (阎世英) Molecular structure and analytical potential energy function of SeCO 2014 Chin. Phys. B 23 093101

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