Infrared and visible laser spectroscopy for highly-charged Ni-like ions
Application of visible or infrared (IR) lasers for spectroscopy of highly-charged ions (HCI) has not been particularly extensive so far due to a mismatch in typical energies. We show here that the energy difference between the two lowest levels within the first excited configuration 3d9.4s in Ni-like ions of heavy elements from Z_N =60 to Z_N =92 is within the range of visible or near-IR lasers. The wavelengths of these transitions are calculated within the relativistic model potential formalism and compared with other theoretical and limited experimental data. Detailed collisional-radiative simulations of non-Maxwellian and thermal plasmas are performed showing that photopumping between these levels using relatively moderate lasers is sufficient to provide a two-order of magnitude increase of the pumped level population. This accordingly result in a similar rise of the x-ray line intensity thereby allowing control of x-ray emission with visible/IR lasers.
Nuclear Instruments & Methods in Physics Research Section B-Beam Interactions With Materials and Atoms
Infrared and visible laser spectroscopy for highly-charged Ni-like ions, Nuclear Instruments & Methods in Physics Research Section B-Beam Interactions With Materials and Atoms, [online], https://doi.org/10.1016/j.nimb.2017.04.025
(Accessed November 28, 2023)