Measuring the wavelengths of the Ni-like 4d ¹S₀ → 4p ¹P₁ and 4f ¹P₁ → 4d ¹P₁ x-ray laser lines

Conference · Mon Sep 21 04:00:00 EDT 1998

OSTI ID:2649

Churilov, S ^[1]; Nilsen, J; Ryobtsev, A

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1. LLNL

In this work we present measurements of the wavelengths of the nickel-like 3d⁹ 4d ¹S₀ → 3d⁹ 4p ¹P₁ X-ray laser line in several low-Z nickel-like ions ranging from yttrium (Z=39) to cadmium (Z=48). With the help of these laser results, we identify this line to very high accuracy in nonlasing plasmas from gallium (Z=31) to molybdenum (Z=42). The measured wavelengths are compared with optimized level calculations using the multi-configuration Dirac-Fock code of Grant et al. As an example, for yttrium, we calculate a wavelength of 240.2 A, and measure wavelengths of 240.11 ± 0.30 A in the lasing plasma and 240.135 ± 0.015 A in the nonlasing plasma. Accurate values of these wavelengths are essential for performing plasma imaging and interferometry experiments with multilayer optics which use the X-ray laser to backlight other plasmas. These results also provide important atomic data which is currently missing about the energy of the 4d ¹S₀, level in the Ni I sequence and help guide evperimentalists who are looking for lasing in these materials for the first time. We also observe lasing on the nickel-like 3d⁹ 4d ¹S₀ → 3d⁹ 4p ¹P₁, X-ray laser line in Zr, Nb, and Mo and present measured wavelengths for these ions as well as predicted values for other nearby ions.

• Research Organization: Lawrence Livermore National Laboratory, Livermore, CA
• Sponsoring Organization: USDOE Office of Defense Programs (DP)
• DOE Contract Number: W-7405-ENG-48
• OSTI ID: 2649
• Report Number(s): UCRL-JC-130946; DP0102052; ON: DE00002649
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
Lasers
Nickel Compounds
Wavelengths