The photochemistry of a series of bis(acyl)phosphine oxides and the rate constants of the reactions of their phosphorus radicals with n-butylacrylate, thiophenol, bromotrichloromethane, oxygen, and methyl viologen have been investigated by laser flash photolysis. The results were compared to a mono(acyl)phosphine oxide ((2,4,6-trimethylbenzoyl)diphenylphosphine oxide). The variation in reactivi...

We theoretically investigate the spin dynamics of a heavy hole confined to an unstrained III-V semiconductor quantum dot and interacting with a narrowed nuclear-spin bath. We show that band hybridization leads to an exponential decay of hole-spin superpositions due to hyperfine-mediated nuclear pair flips, and that the accordant single-hole-spin decoherence time T2 can be tuned over many orders...

Two fermion relativistic bound states: hyperfine shifts. Abstract We discuss the hyperfine shifts of the Positronium levels in a relativistic framework, starting from a two fermion wave equation where, in addition to the Coulomb potential, the magnetic interaction between spins is described by a Breit term. We write the system of four first order differential equations describing this model. We...

A high precision dense grid of reference lines in the hyperfine structure of the B-X system of molecular iodine (127I2) is presented. A simple parametrization has been derived, predicting the hyperfine line positions of the "t" components for vibrational bands (13-1) up to (18-1) and rotational quantum numbers J = (9-140). The analysis in this paper is based on Doppler-free saturation spectrosc...

A general algorithm for computing the quadrupole-hyperfine effects in the rovibrational spectra of polyatomic molecules is presented for the case of ammonia (NH3). The method extends the general variational approach TROVE [J. Mol. Spectrosc. 245, 126-140 (2007)] by adding the extra term in the Hamiltonian that describes the nuclear quadrupole coupling, with no inherent limitation on the number ...

We present La NMR experiments on five powder samples of lanthanum manganites, with a Mn concentration ranging from the antiferromagneticinsulator (AF) to the ferromagnetic-conducting (FM) region of the phase diagram. We measure a positive hyperfine coupling C=0.13 T/μB. A signal from nuclei in a FM environment is present at all compositions, as evidenced by a hyperfine frequency in zero field e...

We present ab initio calculations for the magnetic properties of the ~001! and ~110! bcc Fe/Co interfaces. The calculations are performed by the Korringa-Kohn-Rostoker Green’s-function method using the local-density approximation of density-functional theory. Of central interest is the relation between the hyperfine fields induced on substitutional Cd probe atoms and the magnetization profile a...

The structure and hyperfine magnetic properties of epitaxial Fe ultrathin films on a vicinal Pds110d surface have been investigated by means of low-energy electron diffraction sLEEDd, reflection high-energy electron diffraction sRHEEDd and Fe conversion electron Mössbauer spectroscopy sCEMSd. LEED and RHEED provide evidence for initial pseudomorphic film growth. The RHEED determination of the i...

Theoretical investigations of the hyperfine structure of the hydrogen molecular ion (one electron and two protons) are discussed. The nuclear spin-rotation interaction has been found to be of the same sign as in the hydrogen molecule and the hyperfine transition frequencies can be accurately predicted. With measurements of the hyperfine structure of the deuterium molecular ion (or of HD) it sho...

We report optical double-resonance spectroscopy to locate and study the 7D3/2 and 7D5/2 levels of a sample of Fr atoms confined and cooled in a magneto-optical trap. The upper state of the 7P3/2 trapping transition serves as the resonant intermediate level to reach the 7D states. The energy difference to the ground state is measured for the accessible levels. We measure the hyperfine splittings...