Spectrum and energy levels of the Nd⁴⁺free ion (Nd V)

Abstract

The spectrum of neodymium excited by a sliding spark source was photographed on two vacuum ultraviolet normal-incidence spectrographs. About 250 lines attributed to Nd V, hitherto unknown, have been identified. The analysis of this spectrum established all the energy levels of the configurations 4f2, 4f5d, 4f6s and 4f6p (except for 4f2 1S0). Altogether, 48 known levels classify about 160 lines. Their theoretical calculation includes a least-squares fit with an rms error of 28 cm−1 for the even-parity levels and 26 cm−1 for the odd-parity ones, as well as the best values for relevant radial interaction parameters. In particular, interactions with the core-excited configurations 5p54f3 and 5p54f25d are discussed. Intensities derived from phosphor image plates are used to estimate an effective temperature in the spark of Teff=3.6 eV.

Efficient energy transfer from ZnO to Nd3+ ions in Nd-doped ZnO films deposited by magnetron reactive sputtering

“…In addition, these ions would have only one 4f electron under normal conditions, which means that the excitation spectrum is totally different. All excited states of Nd 4+ are highly energetic, 22 which means that these ions can only be excited by far UV light illumination. However, the observed signals could also be explained by a second Nd site whose valence state is 3+.…”

Spectra of W VIII and W IX in the EUV Region

“…This instrument is equipped with a 3600 lines/mm concave grating, resulting in a plate factor of ~0.25 Å/mm in the first order and a resolution of 0.008Å with a slit width of 30 µm in the range of 200-3000 Å. In the present work at the Meudon Observatory, spectra were recorded in the region of 180-500 Å on phosphor image plates (Fuji BAS-TR 2040), which were processed by a specific reader as described in a previous work on Nd V [16]. A Perkin-Elmer CYCLONE reader with a 43 µm sample step had been used in some earlier recordings, and more recent recordings were read using a FUJI FLA 9000 reader with a 10 µm sample step.…”

Parametrization of free ion levels of four isoelectronic 4f2 systems: Insights into configuration interaction parameters

“…Currently, there is renewed interest, both experimentally and theoretically, in free ion energy levels and the Wyart group has been particularly active in this respect [11][12][13][14][15]. Tabulations of atomic energy levels are available at the National Institute of Standards and Technology (NIST) web site [16].…”