Demonstration of Near Edge X-ray Absorption Fine Structure Spectroscopy of Transition Metals Using Xe/He Double Stream Gas Puff Target Soft X-ray Source

Abstract

A near 1-keV photons from the Xe/He plasma produced by the interaction of laser beam with a double stream gas puff target were employed for studies of L absorption edges of period 4 transitional metals with atomic number Z from 26 to 30. The dual-channel, compact NEXAFS system was employed for the acquisition of the absorption spectra. L1–3 absorption edges of the samples were identified in transmission mode using broadband emission from the Xe/He plasma to show the applicability of such source and measurement system to the NEXAFS studies of the transition metals, including magnetic materials.

Compact NEXAFS System Based on Laser-Plasma Soft X-ray Light Source for the Analysis of Barium Edges in a B+BaF2 Optical Filter

“…The calibration spectra captured for Ar:N 2 :O 2 gas mixture and SF 6 injected into the laser-target interaction region, depicted in Fig. 1b, allowed us to perform the procedure of SXR spectrometer calibration by constructing the calibration curve to match the camera's pixels with the photon energy [20]. To construct the calibration curve, we used positions of the fluorine line λ = 1.6807 nm from F 8+ ion, oxygen line λ = 2.1602 nm from O 6+ ion, two very intensive SXR nitrogen lines λ = 2.489 nm and λ = 2.878 nm from N 5+ ions, and argon lines λ = 4.873 nm and λ = 4.918 nm from Ar 8+ ions.…”

High-Resolution Table-Top NEXAFS Spectroscopy

“…The latter provide a high spectral resolution ( E /Δ E = 1370) at the expense of a very long arm length (several meters) and a limited accessible spectral window, hampering, e.g., pump-probe experiments in which different absorption edges are to be monitored simultaneously. Flat-field gratings with smaller arm lengths and a larger spectral range have until now only been utilized with line densities up to 2400 lines/mm, ,, yielding limited spectral resolution ( E /Δ E < 500).…”

“…The latter provide a high spectral resolution (E/ΔE = 1370 19 ) at the expense of a very long arm length (several meters) and a limited accessible spectral window, hampering, e.g., pump-probe experiments in which different absorption edges are to be monitored simultaneously. Flat-field gratings with smaller arm lengths and a larger spectral range have until now only been utilized with line densities up to 2400 lines/mm, 17,20,21 yielding limited spectral resolution (E/ΔE < 500). Thus, to pave the way for wider dissemination of NEXAFS spectroscopy, there is definitely the need for further compaction and simplification of lab-scale systems, as well as an increased spectral resolution of their spectrometers.…”