Theoretical characterization of selected regions of the ground state potential surface of N2H2

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Abstract
The results of CASSCF/multireference contracted CI calculations with large atomic natural orbital (ANO) basis sets are presented for selected regions of the N2H2 potential surface. The calculations focused on the addition of a H atom to HN2. This process involves four channels. Approach of the H atom along the HN bond leads to N2+H2 with no barrier (H abstraction), while approach of the H atom to the other three positions leads to trans‐HNNH, cis‐HNNH, and NNH2, which are stable minima. These calculations provide the most accurate energetics for these three stable species obtained to date. Combining the results of these calculations with previous results for HN2 provides accurate thermochemical data on these important molecules.

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