Spectral broadening and wavelength shift of emission lines of Li2+ ions in magnetically confined plasmas

A detailed calculation is presented of the line emission profiles of Li2+ ions in a magnetically confined plasma, and applied to interpret the measured spectra from a fusion device. Transition probabilities and wavelengths of Li2+ ions are computed by diagonalizing the Hamiltonian including interactions with the magnetic field. The nl-resolved population densities of exited Li2+ ions are calculated up to n=20 using a collisional-radiative model including the charge exchange process. The calculations show that 1) spectral profiles emitted by excitation, recombination and charge exchange are quite different, which is due to the different n and l-distributions of these basic atomic rate coefficients; and 2) in order to properly interpret low temperature spectra the Zeeman effect has to be accounted for. (author)