Simulations of Al XIII–Fe XXIV X-ray laser photopumping scheme

Electron impact excitation of Al XIII: A relativistic approach

“…Emission lines of Al XIII have been observed in the solar (Phillips et al 1982) as well as in the stellar (Phillips et al 2001) plasmas, particularly in the X-ray region (Dere et al 2001). Additionally, this ion is employed to pump other ions (for example: Li-like iron) in lasing plasmas (Al'Miev et al 2001). With this in view, we have recently reported (McKeown et al 2004) energy levels and radiative rates for transitions in Fe XXIV, and here we present our results for all above named parameters for all transitions up to and including the n = 5 levels of Al XIII.…”

Energy Levels and Radiative Rates for Li-like Ar XVI and Fe XXIV

“…Such measurements provide a good check on the accuracy of theoretical results. Additionally, radiation from the 1s 2 S 1=2 À 2p 2 P o 3=2 transition of H-like aluminium is used to pump the 5p 2 P o 1=2 and 2 P o 3=2 levels of Fe XXIV in lasing plasmas [9,10], which populates the other n ¼ 5 levels, making possible to have gains for the 4p-5d, 4d-5f and 4f-5g transitions. The gains for these transitions are larger than that for the 4s-5p transitions [9].…”

The effect of a radiation field on excitation and ionisation in non-LTE high energy density plasmas

“…However there has been much theoretical work on both the degree to which the two lines coincide (for example [1,27] and on the calculation of the operation of the scheme [20,21] and references contained therein). Possible reasons for this lack of experimental success include the differential Doppler shift between the pumping and pumped plasma and an overestimate of the brightness in the pumping line (possibly due to velocity gradients in the pumping plasma producing much larger effective line widths than have been assumed [2,3,6,[23][24][25]37,38]). Whilst not resulting in gain, other experiments have demonstrated direct photopumping of one plasma by another.…”