FONO - A DIFFICULT CASE FOR THEORY AND EXPERIMENT

被引:40
作者
LEE, TJ [1 ]
RICE, JE [1 ]
机构
[1] IBM CORP, DIV RES, ALMADEN RES CTR, SAN JOSE, CA 95120 USA
关键词
D O I
10.1063/1.463925
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
The equilibrium structures, vibrational spectra, and relative energetics of the FNO2, cis-FONO, and trans-FONO isomers have been investigated using high-levels of ab initio theory. These methods include second-order Moller-Plesset perturbation theory (MP2), singles and doubles coupled-cluster (CCSD) theory, and the CCSD(T) method, which incorporates a perturbational estimate of the effects of connected triple excitations. FNO2 is determined to be 36.9+/-2.5 kcal/mol (0 K) more stable than cis-FONO, which is more stable than trans-FONO by 2.5+/-1.0 kcal/mol (0 K). The molecular structure of cis-FONO is shown to have typical F-O and central O-N single bond distances, indicating that cis-FONO has a structure analogous to HONO. The computed vibrational spectrum of cis-FONO is shown to be consistent with infrared matrix isolation experiments, including isotopic shifts. The experimentally deduced structure of FONO (based on a normal coordinate analysis), however, is shown to be incorrect because one of the vibrational bands included in the normal coordinate analysis is either a combination band or an overtone.
引用
收藏
页码:4223 / 4232
页数:10
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