Journal article
Accurate ab initio ro-vibronic spectroscopy of the X̃2Π CCN radical using explicitly correlated methods
The Journal of chemical physics, Vol.135(14), pp.144309-144309
10/14/2011
Handle:
https://hdl.handle.net/2376/112937
PMID: 22010720
Abstract
Explicitly correlated CCSD(T)-F12b calculations have been carried out with systematic sequences of correlation consistent basis sets to determine accurate near-equilibrium potential energy surfaces for the X(2)Π and a(4)Σ(-) electronic states of the CCN radical. After including contributions due to core correlation, scalar relativity, and higher order electron correlation effects, the latter utilizing large-scale multireference configuration interaction calculations, the resulting surfaces were employed in variational calculations of the ro-vibronic spectra. These calculations also included the use of accurate spin-orbit and dipole moment matrix elements. The resulting ro-vibronic transition energies, including the Renner-Teller sub-bands involving the bending mode, agree with the available experimental data to within 3 cm(-1) in all cases. Full sets of spectroscopic constants are reported using the usual second-order perturbation theory expressions. Integrated absorption intensities are given for a number of selected vibronic band origins. A computational procedure similar to that used in the determination of the potential energy functions was also utilized to predict the formation enthalpy of CCN, ΔH(f)(0K) = 161.7 ± 0.5 kcal/mol.
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Details
- Title
- Accurate ab initio ro-vibronic spectroscopy of the X̃2Π CCN radical using explicitly correlated methods
- Creators
- J Grant Hill - Department of Chemistry, Washington State University, Pullman, Washington 99164, USA. grant.hill@glasgow.ac.ukAlexander MitrushchenkovKazim E YousafKirk A Peterson
- Publication Details
- The Journal of chemical physics, Vol.135(14), pp.144309-144309
- Academic Unit
- Chemistry, Department of
- Publisher
- United States
- Identifiers
- 99900547536901842
- Language
- English
- Resource Type
- Journal article