A study of the mechanism and kinetics of the reaction of O(3P) atoms with propane

The mechanism and kinetics of the reaction of O(³P) atoms with propane were investigated using molecular modulation spectroscopy, with the O(³P) atoms being generated by the Hg photosensitized decomposition of N₂O. The absorption spectrum of the X²II_3/2 state of OH was observed in the ultraviolet between 307 and 309 nm, and it was confirmed that OH was the product of the O(³P) reaction with propane. The rate constants for the reactions of O(³P) and OH with propane were determined to be 3.9±0.7±10¹⁰ and 1.19±0.05±10¹² cm³/mole·sec, respectively, at T=56±5°C.     

Radiative detection of NMR studies of domain nuclei in enriched ferromagnetic iron

Combined host (∼95 at% enriched stable ⁵⁷Fe) and very dilute impurity (∼0.01 at% radioactive ⁶⁰Co) NMR signals have been obtained on the one sample of polycrystalline Fe foil utilising perturbations to the gamma anisotropy from in situ thermally oriented ⁶⁰Co nuclei for both resonances. The NMR-TDNO signals on the ⁵⁷Fe sites have been followed down to applied magnetic fields well below the host magnetic saturation and exhibited two distinct components; a strong, narrow homogeneous signal, superimposed over a broader inhomogeneous signal. The impurity ⁶⁰Co⁵⁷Fe inhomogeneous resonance has been studied with three pulse NMRON and the irreversible decay of the nuclear spin echo measured as a function of applied magnetic field. This revised version was published online in August 2006 with corrections to the Cover Date.     

Magnetic anisotropy of Pm impurity in rare earth–nickel compound

Low-temperature nuclear orientation was applied to study hyperfine interactions of ¹⁴²Pr, ¹⁴⁷Nd and ^143,144Pm nuclei in Pr^0.5Nd^0.5Ni single crystal. Angular distributions, temperature dependence and external magnetic field effects on the γ-ray anisotropy are presented. A Nd-Pm exchange interaction seems to dominate the magnetic properties of Pm ions in this system. This revised version was published online in August 2006 with corrections to the Cover Date.