Short- and long-range binding of Be with Mg in the X1Σ+ ground state and in the A1Π excited state.

We present results of configuration-interaction (CI) computations of wavefunctions and of properties of the first two singlet states, X(1)Σ(+) and A(1)Π, of the, as yet unobserved, BeMg polar molecule, for internuclear distances in the range [2.5-1000] Å. The X(1)Σ(+) state is very weakly bound, (D(e) = 469.

Shape resonances as poles of the semiclassical Green's function obtained from path-integral theory: application to the autodissociation of the He2++ 1sigma(g)+ state.

It is known that one-dimensional potentials, V(R), with a local minimum and a finite barrier towards tunneling to a free particle continuum, can support a finite number of shape resonance states. Recently, we reported a formal derivation of the semiclassical Green's function, G(SC)(E), for such V(R), with one and two local minima, which was carried out in the framework of the theory of path integrals [Th. G.

Stabilization and relative phase effects in a dichromatically driven diatomic Morse molecule: interpretation based on nonlinear classical dynamics.

The dissociation dynamics of a dichromatically laser-driven diatomic Morse molecule vibrating in the ground state is investigated by applying tools of the nonlinear theory of classical Hamiltonian systems. Emphasis is placed on the role of the relative phase of the two fields, phi. First, it is found that, just like in quantum mechanics, there is dependence of the dissociation probability on phi.