  Interactions between different bound states in bosonic systems can lead to
pair creation. We study this process in detail by solving the Klein-Gordon
equation on space-time grids in the framework of time-dependent quantum field
theory. By choosing specific external field configurations, two bound states
can become pseudodegenerate, which is commonly referred to as the
Schiff-Snyder-Weinberg effect. These pseudodegenerate bound states, which have
complex energy eigenvalues, are related to the pseudo-Hermiticity of the
Klein-Gordon Hamiltonian. In this work, the influence of the
Schiff-Snyder-Weinberg effect on pair production is studied. A generalized
Schiff-Snyder-Weinberg effect, where several pairs of pseudodegenerate states
appear, is found in combined electric and magnetic fields. The generalized
Schiff-Snyder-Weinberg effect likewise triggers pair creation. The particle
number in these situations obeys an exponential growth law in time enhancing
the creation of bosons, which cannot be found in fermionic systems.
