Six-dimensional potential energy surface and rotation–vibration energy levels of HNCO in the ground electronic state
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Abstract
A six-dimensional potential energy surface based on CCSD(T)/cc-
-pCVQZ ab initio energy points was developed for HNCO in the 1A¢ ground electronic state and used to calculate rotation–vibration energy levels for J £ 5. The barrier to linearity was computed to be 1834 cm-1 for the angle HNC and 336 cm-1 for the angle NCO. The fundamental transitions were obtained for the main form and four isotopic variants of HNCO. The state mixing n3/2n6 was identified with the help of an adiabatic projection scheme.
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