The lowest singlet-triplet gap in CCl2, CBr2 and CI2

Lee, E. P. F., Dyke, J. M. and Wright, T. G. (2000) The lowest singlet-triplet gap in CCl2, CBr2 and CI2 Chemical Physics Letters, 326, (1-2), pp. 143-150. (doi:10.1016/S0009-2614(00)00737-5).


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High-level ab initio calculations are performed to determine the lowest singlet-triplet (S-T) gap in CCl2, CBr2 and CI2. For CCI2 all-electron basis sets are used. For CBr2 all-electron and effective core potential (ECP) basis sets are used, whilst for CI2 only ECP basis sets are used. Methods up to CCSD(T) are employed, as well as the B3LYP method. The conclusions are that for CCl2 the S-T gap is 20 +/- 1 kcal mol(-1) and that the gaps for CBr2 and CI2 are 17 +/- 2 kcal mol(-1) and 9 +/- 2 kcal mol(-1), respectively. Some comments are made regarding the disagreement with recent photodetachment studies.

Item Type: Article
Digital Object Identifier (DOI): doi:10.1016/S0009-2614(00)00737-5
ISSNs: 0009-2614 (print)
Keywords: ab-initio, chemistry, spectra, dibromocarbene, halocarbenes, potentials, methylene, energy
Subjects: Q Science
Q Science > QD Chemistry
ePrint ID: 18980
Date :
Date Event
11 August 2000Published
Date Deposited: 21 Dec 2005
Last Modified: 16 Apr 2017 23:07
Further Information:Google Scholar

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