Measurement of the Ly-α Mg resonance with the 2s→3pNe-like Ge line

Abstract

Measurements and calculations of the resonance between the Ly-a line of magnesium and the 2s~3p transition in neonlike germanium are presented. This resonance is of possible use as part of a resonantly photo-pumped x-ray laser scheme recently proposed which would lase on several 2p~2 s transitions be-0 tween 64 and 89 A in neonlike germanium. Measurements of the resonance are made by three different approaches: one using the electron beam ion trap, the second using laser-produced plasma, and the third on a tokamak. These results are compared with calculations and other measurements.Certain discrepancies are observed with previous measurements which may be due to the partial overlap between oxygenlike and neonlike lines in germanium. The results do show a good resonance between magnesium and germanium, with the germanium line between the two Ly-a components of magnesium but nearer to the short-wavelength component.PACS number(s): 32.30. Rj, 42.60.By

Review of theoretical works on X-ray laser research performed at RFNC — VNIITF

“…The degree of resonance | \ p -X^ | /\ p provided by the theoretical wavelength of the Mg Ly-a] pump line \ P (Nilsen et al 1992) and the wavelength of the ground state to the 2s i/2 3p l/2 (J = 1) state transition in Ne-like Ge \ A calculated with the combined MCDF + MZ approach was found to be less than 1 x 10~4 (Nilsen et al 1994;Loboda et al 1995).…”

“…-2/? 6 transition in Ne-like Ge are noticeably different from each other (Nilsen et al 1994). In this connection, refined highresolution measurements of this wavelength along with the theoretical calculations accounting for the correlation and relativistic effects as completely as possible have been performed (Nilsen et al 1994;Loboda et al 1995).…”

“…The next step in the theoretical studies of laboratory XRLs performed in collaboration with Dr. J. Nilsen was the investigation of a new XRL scheme, which would lase on the electron hole 2s-2p transitions in Ne-like Ge near 64, 77, and 89 A resonantly photopumped by using Ly-a radiation from H-like Mg (Politov & Shinkarev 1993;Politov et al 1994a).…”

Resonant photo-pumping x-ray-laser scheme using intense characteristic x rays for water-window radiation generation

“…One of the candidates of the water-window XRL is the photo-pumping XRL where several schemes have been investigated theoretically [7][8][9][10]. Resonant photo-pumping is one of them in which a spectral line emission from particular ions is absorbed by different element ions to create the population inversion in the latter.…”

“…Also, the accurate wavelengths of many spectral lines of highly charged ions were determined by use of the electron-beam ion trap (EBIT). The data obtained by the EBIT group were used to find the candidate pairs of ions for photo-pumping XRLs [7].…”