EUV magnetic-dipole lines from highly-charged high-Z ions with an open 3d shell

Abstract

Abstract. The electron beam ion trap (EBIT) at the National Institute of Standards and Technology was used to produce highly-charged ions of hafnium, tantalum and gold with an open 3d shell. The extremeultraviolet (EUV) spectra from these ions were recorded with a flat-field grazing-incidence spectrometer in the wavelength range of 4.5 nm to 25 nm. A total of 133 new spectral lines, primarily due to magneticdipole transitions within the ground-state 3d n configurations of the Co-like to K-like ions, were identified by comparing energy-dependent experimental spectra with a detailed collisional-radiative modeling of the EBIT plasma.

Breit and QED effects on the 3d9D3/22→2DSi1, Guo2, Brage3 et al. 2018Phys. Rev. A302251View full textAdd to dashboardCite

“…Up to now, the spectral line from the 3d 9 2 D 3/2 → 3d 9 2 D 5/2 transition has only been directly obsereved for seven of the Co-like ions(Zr 13+ , Nb 14+ , Mo 15+ , Hf 45+ , Ta 46+ , W 47+ and Au 52+ [13][14][15]).…”

Multi-configuration Dirac–Hartree–Fock calculations of forbidden transitions within the 3dk ground configurations of highly charged ions (Zhao1, Wang2, Li3 et al. 2018Atomic Data and Nuclear Data TablesSelf Cite

“…There exist many experimental investigations of forbidden transitions within the 3s 2 3p 6 3d k (k = 1 − 9) ground configurations in these M-shell ions with measurements from EBITs at NIST [1][2][3][12][13][14][15] and at the Lawrence Livermore National Laboratory [10]. There are also several theoretical studies (see e.g., Refs.…”

Identification and Plasma Diagnostics Study of Extreme Ultraviolet Transitions in Highly Charged Yttrium

“…While elements with a high-Z atomic number have these effects amplified, ions in the medium-Z region have special importance because they allow for more accurate experiments and provide constraints to theoretical trends. In the past few years, the electron beam ion trap (EBIT) research program at the National Institute of Standards and Technology (NIST) has reported accurate measurements in the extreme ultraviolet (EUV) region that focus on systematic observations of transitions in L-shell, M-shell and N-shell ions [2][3][4][5][6][7][8][9][10][11][12][13][14]. The work reported here extends these results to a range of previously unobserved transitions of a fifth row element, yttrium.…”