In a recent series of papers [1,2] a detailed study of a suitable Effective Field Theory for heavy quark bound states, called potential NRQCD (pNRQCD) [3], has been started. Since several issues have been treated in that context, we address the reader to the quoted literature for a complete overview of the achieved results. Here we only mention the 1-loop matching [4] and the static energies of...

Described here is a proposed experiment to use laser-assisted photorecombination of positrons from a trap-based beam and metal atoms in the gas phase to measure positron–atom binding energies. Signal rates are estimated, based in part upon experience studying resonant annihilation spectra using a trapbased positron beam. While positrons are important in many areas of science and technology incl...

The autodetachment spectrum of acetaldehyde enolate anion, CH,CHO-, is recorded near 14180 cm-’ using a coaxial laserion threshold photodetachment spectrometer. The spectrum represents transitions from u= 1 in the v) C-C-O bending mode of CH,CHOto u=O m the autodetaching dipole-bound state of the anion. The 32 rotationally resolved (0, 1) hot band transitions reported here were fit to Watson’s ...

A family of orbiting resonances in molecular scattering is globally described by using a single pole moving in the complex angular momentum plane. The extrapolation of this pole at negative energies gives the location of the bound states. Then a single pole trajectory, that connects a rotational band of bound states and orbiting resonances, is obtained. These complex angular momentum singularit...

N-dark–dark solitons in the integrable coupled NLS equations are derived by the KP-hierarchy reduction method. These solitons exist when nonlinearities are all defocusing, or both focusing and defocusing nonlinearities are mixed. When these solitons collide with each other, energies in both components of the solitons completely transmit through. This behavior contrasts collisions of bright–brig...

The formulation of Grand Unified Theories, which allow magnetic monopole-like solutions [1], has stimulated a wide interest in the search of magnetic monopoles and recently evidence has been claimed of their detection [2]. In view of planning further efforts to confirm the existence of magnetic monopoles, it is useful to know the behaviour of these particles when they reach Earth. With this pur...

Ab initio calculations of electronic states of the dication C02+, using highly efficient configuration-interattion procedures, are reported. For the lower states, energies are believed to be accurate to within 0.2 eV, but the higher states are less reliable. The complexity of the problem is due to mixing of states of radically different character, such as strongly bound chargepolarization state...

A new quantum model with rational functions for the potential and effective mass is proposed in a stretchable region outside which both are constant. Starting from a generalized effective mass kinetic energy operator the matching and boundary conditions for the envelope wave functions are derived. It is shown that in a mapping to an auxiliary constant-mass Schrödinger picture one obtains one-pe...

A pseudo-Hermitian square-well model “with spin” is proposed, solved and discussed. The domain of parameters is determined where all the bound-state energies remain real and where the necessary transition from the original elementary non-physical indefinite pseudo-metric to another, more involved but correct positive-definite physical metric is possible. PACS 03.65.Ge 03.65.Ca 03.65.Ta 02.60.Lj...

The concept of the potential acting between charged particles is reviewed within the framework of quantum electrodynamics. The one-photon and two-photon exchange potentials V 1 γ and V 2 γ are discussed, with attention to the following features: the dependence of V 2 γ on the choice of V 1 γ, the distinction between FGI (Feynman gauge inspired) and CGI (Coulomb gauge inspired) potentials, and t...