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Stolow and his co-workers found that the non-resonant field from an intense 150 fs laser pulse, that is fired during the excitation pulse, changes the potential energy curves enough that only 60 percent of the bromine atoms are formed in their excited state.
3 Confined isoelectronium approach We have shown until this point that the M3CS-S model satisfies the established conditions for the existence of isoelectronium with two drawbacks: it lacks the precision to represent the ground state potential energy curve of the hydrogen molecule and does not give a good approximation to its optimum bond length.
The ellipse denotes the constant potential energy curve.