8 research outputs found
E1 amplitudes, lifetimes, and polarizabilities of the low-lying levels of atomic ytterbium
The results of ab initio calculation of E1 amplitudes, lifetimes,and
polarizabilities for several low-lying levels of ytterbium are reported. The
effective Hamiltonian for the valence electrons has been constructed in the
frame of CI+MBPT method and solutions of many electron equation are found.Comment: 11 pages, submitted to Phys.Rev.
Spectroscopy of Dark Soliton States in Bose-Einstein Condensates
Experimental and numerical studies of the velocity field of dark solitons in
Bose-Einstein condensates are presented. The formation process after phase
imprinting as well as the propagation of the emerging soliton are investigated
using spatially resolved Bragg-spectroscopy of soliton states in Bose-Einstein
condensates of Rubidium87. A comparison of experimental data to results from
numerical simulations of the Gross-Pitaevskii equation clearly identifies the
flux underlying a dark soliton propagating in a Bose-Einstein condensate. The
results allow further optimization of the phase imprinting method for creating
collective exitations of Bose-Einstein condensates.Comment: 14 pages, 9 figure