Fast-beam-spectroscopy by combined gas cell-laser excitation for cascade-free lifetime measurements of highly excited states

Abstract

The fast-beam-spectroscopy is used for cascade-free high-precision lifetime measurements of highly excited atomic states, which are populated by a two-stage excitation as resulting from gas cell and laser interactions. An experimental extension of the method is presented demonstrating the selective population of high lying levels even from shorterliving intermediate states by an intracavity dye-laser excitation. A first example for this type of experiments is given for the lifetime of the Li 3d 2D level, which was determined to be ~(3 2D)= 14.60_+0.13 ns. The appropriate experimental set-up is described in detail and an approximate expression for signal calculation is presented, by which the applicability of this method to other levels can be estimated.

Relativistic spectroscopy of plasma-embedded Li-like systems with screening effects in two-body Debye potentials

“…Using these values, we have calculated the lifetimes of the excited states, which are given in the same 1.20(0) [11] tables. Our theoretical estimated lifetimes of the excited states in Li I match well with the experimental values [52][53][54][55].…”

“…Using these values, we have calculated the lifetimes of the excited states which are given in the same table. Our theoretical estimated lifetimes of the excited states in Li I are in good match with the experimental values [44][45][46][47]. Experimental results for the lifetimes of the excited states of Ca XVIII are not available.…”

Theoretical lithium 22S→22Pand 2Zhou1, Drake2 1995Phys. Rev. A

“…Schulze-Hagenest et al [5] Azencot and Goutte [6] Heldt and Leuchs [7] Pipin and Bishop [23] Chung [25] This work (M =~) …”

Accurate Experimental Lifetimes of Excited Levels in Nd II

“…[SI), a crossed CW laser field (e.g. or a combination of a gas target and a crossed CW laser field [12][13][14]. Instead of using a beam of ions, i.e.…”