Analysis of high-ndielectronic Rydberg satellites in the spectra ofNa-likeZnXX and

Abstract

We have observed spectra from highly charged zinc ions in a variety of laser-produced plasmas. Spectral features that are Na - and Mg -like satellites to high- n Rydberg transitions in the Ne -like Zn XXI spectrum are analyzed and modeled. Identifications and analysis are made by comparison with highly accurate atomic structure calculations and steady state collisional-radiative models. Each observed Zn XX and Zn XIX feature comprises up to approximately 2 dozen individual transitions, these transitions are excited principally by dielectronic recombination through autoionizing levels in Na - and Mg -like Zn19+ and Zn18+. We find these satellites to be ubiquitous in laser-produced plasmas formed by lasers with pulse lengths that span four orders of magnitude, from 1 ps to approximately 10 ns. The diagnostic potential of these Rydberg satellite lines is demonstrated.

Spectroscopy Methods and Applications of the Tor Vergata Laser‐Plasma Facility Driven by GW‐Level Laser System

“…(a) The conversion efficiency η from IR laser light to soft X-rays depends on the used target since it is related to the resonance line position-varying for different elements (e.g., lines 5C and 5D for Cu [13,29] and lines 4C and 4D for Zn [18], as also shown in Figure 21, falling into the spectral range 1.3-1.55 keV)-of the energetic levels involved in the radiation emission ( Figure 11).…”

“…In this framework, we have recently carried out a series of experiments devoted to emphasize the importance of the line structure (e.g., satellites) in the X-ray spectra in order to develop a reliable diagnostics of plasma state estimating its main parameters. More precisely, the experimental tests have especially concerned: (1) measures and identifications of the L-shell Rydberg series in the soft X-ray spectrum of Ne-like Zn XXI ions with particular reference to the high-n dielectronic Rydberg satellites from Mg-like Zn XIX and Na-like Zn XX ions [18] and (2) measurements and modeling of the soft X-ray emission of a barium plasma in the spectral range of high-n Rydberg levels in a near Ni-like Ba XXIX ionization state [20].…”

“…More precisely, in the field of laser-induced plasmas, the main applications [7,8] concern the traditional area of inertial confinement fusion [9,10], astrophysics [11,12], X-ray spectroscopy [4,[13][14][15][16][17][18][19][20], X-ray imaging [4,[21][22][23], quantum electrodynamics and high-energy physics [24][25][26], atomic physics [27], solid-state physics [28], conversion efficiency studies from laser radiation to UV or X-rays [4,5], evaluation of the energy of the radiation backscattered by plasma and of its reflectivity [4], and so on.…”

“…In this paper the attention will focus on a specific laserplasma source (TVLPS), installed and actually operating at the Quantum Electronics and Plasma Laboratory of the Tor Vergata University (Rome, Italy), based on a high-intensity, GW-level, multistage, pulsed, tabletop Nd:YAG/Glass laser. Specifically, in this paper some results and applications of this laser-plasma source are given concerning soft X-ray spectroscopy [18][19][20] and imaging, especially in the field of the microradiographies of thin biological samples [23].…”

“…For example, X-ray emission spectra both of He-like and Ne-like ions have been used as diagnostic tool for several types of plasmas, such as those of astrophysical interest [19]. Significant information in the field of plasma physics have been also obtained by means of model calculations and measurements of the X-ray emission spectra of a barium (Ba) plasma in spectral range of high-n (principal quantum number) Rydberg levels in a near Ni-like Ba XXIX ionization state [20] and by the analysis of high-n dielectronic Rydberg satellites in the near Ne-like Zn XXI ion spectra from Mg-like Zn XIX and Na-like Zn XX ions [18] (Section 4). A further observation emerges from the analysis of X-ray spectra (e.g., those due to near Ne-like Fe XVII ion stages), namely, a dependence of line strengths from laser intensity on the target affecting the plasma conditions (i.e., temperature).…”