Summary report 2005

Full text: Optical Spectroscopy of Nuclear Fusion Plasma was the main subject of our investigations during the last three years. The new summation rules for Coulomb wave function products (M.Chibisov et al., PRL, 84, 3, 451 2000; JETP, 90, 2, 276, 2000; J. Phys. B, 34, 49, 2001) were the basis for the renovation of this topic. It was found that properties of Coulomb Rydberg states, perturbed by neutral atom, differ essentially from properties of unperturbed states (M. Chibisov et al., J. Phys. B, 35, L193, 2002; PRA 66, 042709, 2002). In particular, Radiation Life Times of perturbed Rydbergs are in 3-7 times larger than unperturbed one's with principal quantum numbers n=25-35. Coulomb Rydberg states are present also in collisions of negative and positive atomic ions as a result of the charge transfer process and the inverse process: A++B-↔A**(nlm)+B. Energy splittings at avoided crossings are expressed through the new sum of Coulomb wave function products and this sum has been investigated also (M. Chibisov, JETP, 93, 2, 256, 2001; Physics-Uspekhi (45) (1) 1-26, 2002). The cross sections of these processes depend strongly on properties of these sums. The collisions H-+H+ and He++ have been studied in details. The cross sections of the excitation (de-excitation) and single-electron capture processes in the collision H++He* (1s,nLm) have been calculated in close coupling approach (M. Chibisov et al., J. Phys. B, 34, 2631, 2001; J. Phys. B, 35, 5081, 2002). At large internuclear distances R in final states H*(nLm)+He+ (1s) the excited hydrogen is perturbed by the electric field of the He+ ion and the hydrogen states should be Stark states. Energies of these states are changed proportionally R-2 and crosses the excited helium states at large distances R. As a result, the cross sections of the excitation (de-excitation) are very large, 10-14-10-13cm2 for n = 3, 4, 5, at collision velocities 106-108cm/s. These processes play an important role in the radiative-collisional kinetics of Tokamak divertor plasmas, when seeded with He, as well as in the attenuation kinetics of diagnostic and heating neutral helium beams (particularly with a metastable atom admixture) when penetrating a fusion plasma. We study now another processes when the new summation rules of Coulomb wave function products are important. (author)