Line overlap measurements for resonant photo-pumping of X-ray lasers

Journal Article · Thu Apr 01 04:00:00 EST 1993 · Bulletin of the American Physical Society

DOI:https://doi.org/10.1063/1.43665· OSTI ID:243640

Elliott, S R; Beiersdorfer, P; Nilsen, J ^[1]

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1. Lawrence Livermore Lab., CA (United States)

Resonant photo-pumping has been suggested as an alternative to collisional excitation and recombination for the creation of a population inversion for use in laboratory soft x-ray lasers. In such a scheme, a radiative transition energy in the pump ion nearly coincides with the excitation energy of the lasant ion. Calculations have identified numerous such pairs of ions. Though some such pairs follow trends in an isoelectronic sequence, others are chance occurrences. The calculations of the energies are reliable to approximately 1 part in 10{sup 3}, whereas the success of the photo-pumping scheme requires better than a part in 10{sup 4}. Thus, spectroscopic measurements are required to determine the viability of a predicted resonance. This work presents data taken on the LLNL EBIT to search for the possible photo-pumping of the 3p-3s lasing transitions in Ne-like ions of elements with Z=30-40 and the 4d-4p lasing transitions in Ni-like ions of elements Z=25-75. In addition, candidate pump lines were measured in various H-, He-, Ne- and Ni-like ions. To date, the most promising candidate is Ni-like Pt pumping Ne-like Rb at 2512 eV. The line energies differ by 0.4 {+-} 0.1 eV or by 160 ppm.

• Sponsoring Organization: USDOE
• DOE Contract Number: W-7405-ENG-48
• OSTI ID: 243640
• Report Number(s): CONF-9304297--
• Journal Information: Bulletin of the American Physical Society, Journal Name: Bulletin of the American Physical Society Journal Issue: 2 Vol. 38; ISSN BAPSA6; ISSN 0003-0503
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
66 PHYSICS
EMISSION SPECTROSCOPY
ENERGY-LEVEL TRANSITIONS
ISOELECTRONIC ATOMS
OPTICAL PUMPING
RESONANCE
X-RAY LASERS