Effects of optical radiation on the Mössbauer spectrum of 151Eu3+: CaF2

We study the changes in the shape of the Mössbauer spectrum for the 21.5?keV transition of ¹⁵¹Eu³⁺ nuclei in a CaF₂ lattice, assuming that a population of the excited electronic state ⁵ D ₀ is maintained by optical pumping. For a population of the excited state ⁵ D ₀ of 10%, we determine the magnitude of the changes in the Mössbauer spectrum as 1.9% of the area of the unperturbed spectrum.     

Eliminating phase-shift errors in interferometry

A noiseless algorithm for analyzing phase-shifting interferograms is proposed.     

Experimental observation of laser-induced modification of Mössbauer spectra

Abstract

The modification of Fe⁵⁷ Mössbauer spectra of a MgO single crystal under the action of laser radiation was observed. A possible interpretation of the observed effect is proposed.     

Structural and hydrogen absorption/desorption properties of Zr2(Co0.5Fe0.2Ni0.2V0.1) intermetallic alloy

The Zr₂(Co_0.5Fe_0.2Ni_0.2V_0.1) intermetallic alloy was prepared by arc melting method and its physical properties and hydrogen storage performance were investigated. XRD analysis by Rietveld refinement and Mössbauer spectroscopy measurements revealed a multiphase crystal structure, in which the dominant phases are C16 Laves phase. The hydrogen-induced cracks, chemical composition, and elements distribution were analyzed by SEM and EDX mapping. The optimum conditions for the activation process, hydrogen absorption kinetics, cyclic durability performance, and disproportionation behavior were discussed. Zr₂(Co_0.5Fe_0.2Ni_0.2V_0.1) alloy has a high absorption kinetic rate, with an activation energy of 10.11 kJ/mol, high hydrogen capacity (2.1 wt%) at room temperature, and good anti-disproportionation behavior (hydrogen pressure up to 8 bar and temperature below 783K). The hydrogen capacity decreased in the first three cycles (~25%) and then remained almost stable, which is likely caused by the high stability of hydride. The studied hydride has interesting features that can be considered for practical applications.     

Solution of the problem of phase ambiguity by integer interferometry

An automatic method is proposed to resolve phase ambiguity in interpreting fringe patterns by a series of two phase distributions with different periods. The method does not require identification of local phase transitions in adjacent image regions and can determine the total phase at each point separately.     

A multichannel pulse integrator for a Mössbauer spectrometer

The multichannel pulse integrator has a 1024-channel memory with 20 bits per channel. The storage device is based on KP537PY 13A static random-access memory integrated circuits. The pulse integrator operates in Mössbauer measurement and amplitude analysis modes, in modes of data output to a computer and display on an oscilloscope screen. It is reliable and efficient, and its design is simple.