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At least 613 records · Page 34
All sourcesNASA NTRSDOE OSTI
DOE OSTI2021

Oxygen Generation via Water Splitting by a Novel Biogenic Metal Ion-Binding Compound

The discovery that MB will couple the oxidation of H 2 O to metal ion reduction and the release of O 2 suggests that methanotrophs expressing MB may be able to maintain their activity under hypoxic/anoxic conditions through the “self-generation” of dioxygen required for the initial oxidation of methane to methanol. Such an ability may be an important factor in enabling methanotrophs to not only colonize the oxic-anoxic interface where methane concentrations are highest but also tolerate significant temporal fluctuations of this interface.

59 BASIC BIOLOGICAL SCIENCES↗
DOE OSTI2019

Static and Dynamic Contributions to the Splitting of the Eu{sup 2+} Ground State in SrMoO{sub 4}

The EPR spectrum of an Eu{sup 2+} impurity center in a SrMoO{sub 4} single crystal in the temperature range T = 1.8, 111–300 K has been studied, and the temperature changes in the spin Hamiltonian parameters describing the EPR spectrum of odd europium isotopes have been determined. It is shown that small temperature changes in the diagonal parameters of the spin Hamiltonian (for odd Eu{sup 2+} isotopes) b{sub 2}{sup 0}(T) = b{sub 2}(F) + b{sub 2}(L) and P{sub 2}{sup 0}(T) = P{sub 2}(F) + P{sub 2}(L) are explained by the compensation of spin–phonon contributions b{sub 2}(F) and P{sub 2}(F) by the contributions of the lattice thermal expansion b{sub 2}(L) and P{sub 2}(L). The quantities b{sub 2}(L) and P{sub 2}(L) that are dependent on the static lattice parameters at a given temperature, are estimated in terms of the superposition Newman model. Then, the spin–phonon b{sub 2}(F) and P{sub 2}(F) contributions determined by the lattice ion vibrations are separated. An analysis shows that b{sub 2}{sup 0}(F) and P{sub 2}{sup 0}(F) > 0, b{sub 2}(L) and P{sub 2}(L) < 0, and the temperature behavior of the spin–phonon contribution is well described by G. Pfister’s model of local vibrations.

75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND↗
DOE OSTI2026

Observation of spin‑wave altermagnetic splitting in MnF2

-Contents of the Data Repository: - Polarized neutron diffraction data acquired in the (HK0) scattering plane. - Inelastic neutron scattering (INS) data from both unpolarized and polarized measurements with an incident neutron energy of Ei =9 meV.- - Reduced multidimensional single-crystal datasets (MDE) and corresponding S(Q,ω) slices used to generate all figures presented in the manuscript. - Julia source code and supporting input files used for spin-wave calculations, model fitting, and simulation of neutron scattering intensity maps.

75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND↗