A. Bar-Shalom

Identification of the spectra of Hf xlv, Ta xlvi, W xlvii, and Re xlviii isoelectronic to Ni i in laser- produced plasmas

The x-ray spectra in the range 5–8 A emitted from laser-produced plasmas of Hf, Ta, W, and Re were observed. Lines belonging to the 3d10 − 3d9 4f and 3d10 − 3d9 4p transitions, as well as the 3p63d10 − 3p53d10 4s and 3p63d10 − 3p53d10 4d transitions in the Ni-like isoelectronic sequence, were identified. In addition, the interpretation of some previously measured lines of the same sequence were revised.

Classification of X-Ray Spectra from Laser Produced Plasmas of Atoms from Tm to Pt in the Range 6-9 Å

X-ray spectra of highly ionized tungsten and neighbouring atoms (Tm, Yb, Hf, Ta, W, Re and Pt) has been observed from laser produced plasmas in the λ = 6-9 A range. Beside the prominent lines of the Ni I-like ions, lines belonging to Co I (3d9-3d84p), Cu I (3d104s-3d94s4p, 3d104p-3d94p2) and Zn I-like ions (3d104s2-3d94s24p, 3d104s4p-3d94s4p2) have been identified. Classification was based on isoelectronic sequence analysis and on comparison with ab-initio relativistic calculations. A collisional-radiative model of the Cu I-like ions in the plasma is used to show that the contribution of the 3d104d-3d94p4d and 3d104f-3d94f4p transition arrays to the 3d-4p spectrum is small. The importance of configuration interaction is pointed out. Computations agree with measurements within experimental uncertainty.

Nickel-like spectra of elements Y xii to Ag xx from a vacuum spark

The spectra of elements Y, Zr, Nb, Mo, Ru, Rh, Pd, and Ag in the 10–100-A range were obtained from a high-power vacuum spark and a grazing-incidence high-resolution spectrograph. The transitions 3d10–3d94p, 3d10–3d94f, 3d10–3d95p, and 3d10–3d95f were identified. The agreement with ab initio relativistic calculations is good. The relevance of the jj coupling scheme for level labeling is discussed, as is the importance of relativistic effects, by comparing the scheme with other results on high-Z atoms (up to Pt).

Nickel-like spectra of Tm XLII and Yb XLIII from laser produced plasma

Abstract The X-ray spectra of laser produced thullium and ytterbium plasmas have been obtained in the range 5–9 A. The lines belonging to the 3d-4p, 3d-4f, 3p-4s and 3p-4d transitions in the Ni isoelectronic sequence (ground state 3d 10 ) have been identified.

Identification of 3d–4p transitions in Co-like W xlvii and Tm xliii and in Cu-like W xlvi and Tm xli from laser-produced plasmas

We observed and identified 3d–4p transitions in Co-like (3d9–3d84p) and Cu-like (3d104s–3d94s4p, 3d104p–3d94p2, 3d104d–3d94p4d, 3d104f–3d94p4f) x-ray spectra of W xlviii and W xlvi (~6–7.5A) and of Tm xliii and Tm xli (8–9 A). The spectra were obtained by irradiating planar targets with high-intensity laser light. Identification was based on isoelectronic sequence analysis and on comparison with ab initio relativistic calculations. The importance of configuration interactions in Cu-like spectra is pointed out. Agreement between computations and measurements was good.

3d-4p transitions in the soft X-ray spectra of Mo XIV and of isoelectric Y to Ag ions, from a low-inductance vacuum spark☆

Abstract Eight lines of 3d 10 4s-3d 9 4s4p and 3d 10 4p-3d 9 4p 2 transitions of Cu I-like Y XI to Ag XIX ions are identified in the 30–80 A range of spectra emitted from a low-inductance vacuum spark. Identification is based on isoelectronic analysis and comparison with ab-initio relativistic calculations.

Classification of CuI like 3p-4s and 3p-4d transitions in X-ray spectra from laser-produced plasmas of atoms from Tm to Re in the range 4–8 Å

Abstract CuI like satellites of the NiI like 3p-4s and 3p-4d resonance transitions are observed in the X-ray spectra emitted from laser-produced plasma of tungsten and neighbouring atoms (Tm, Yb, Ta, Re). The classification is based on both isoelectronic sequence analysis and comparison with ab initio relativistic calculations.

Nickel-like spectrum of platinum emitted from a laser-produced plasma

Abstract The X-ray spectrum of a laser-produced platinum plasma in the range 4.8–6.4 A has been obtained. The lines belonging to the 3d-4p and 3d-4f transitions in the NiI isoelectronic sequence have been identified.