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Molecular Physics
An International Journal at the Interface Between Chemistry and Physics
Volume 109, 2011 - Issue 22
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Research Articles

Theoretical spectroscopy of the HNCl anion

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Pages 2655-2662 | Received 25 Aug 2011, Accepted 26 Sep 2011, Published online: 26 Oct 2011
 

Abstract

Ab initio computations have been performed to investigate the stability and the spectroscopy of the HNCl anion. Using explicitly correlated coupled-cluster methodology and core-valence basis set, the linear–bent path of the neutral and anionic molecules have been computed, and the adiabatic electron affinity of HNCl has been deduced at 1.29 eV. The three-dimensional potential energy surface of the neutral HNCl () and of the HNCl () anion have also been generated using the same computational approach, and their analytical representations have been used for the variational determination of their rovibrational energy levels. Our computations reveal the localization of the additional electron into an anti-bounding molecular orbital associated with the N–Cl bond. The modelling of the photoelectron spectrum of HNCl and DNCl is also presented, showing the vibrational progression associated with the N–Cl stretching mode.

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