Abstract
Potential energy surfaces for the H+4 system are calculated by the valence bond diatomics‐in‐molecules method in the zero overlap‐of‐atomic‐orbitals approximation. The adiabatic potential energy surfaces are obtained by the diagonalization of an 8×8 Hamiltonian matrix and are ideally suited for classical trajectory studies involving electronic transitions. The ground state surface of H+4 is discussed and particular emphasis is given to those regions of configuration space for which this surface avoids an intersection with that of the first excited electronic state.

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