The role played by the bosonic or fermionic character of He atoms surrounding a Br2(X) molecule is analyzed through vibrotational Raman spectra simulations. Quantum chemistry-type calculations reveal the spin multiplicity to be chiefly responsible for the drastic difference observed by Grebenev et al. [Science 279, 2083 (1998)]] in the rotational structure of molecules embedded in helium droplets.

When free radicals are produced in solution they are invariably created in pairs. Since small free radicals react with very low activation energies it might be thought that they recombine immediately and no radicals would escape this early, “geminate”, period. That they do results from two factors. Firstly the breaking of chemical bonds occurs with release of energy so that the radicals separat...

The paramagnetic effect of Mn2+ on the electron paramagnetic resonance spectrum of a nitroxide spin label covalently attached to the active-site serine residue of des-1-41-light chain bovine plasma-activated protein C, and situated at a distance of approximately 1.2 nm from this amino acid, has been utilized to estimate the distance on the enzyme surface between the single Mn2+ site and the fre...

Let V be any vector bundle over the sphere S n which is associated to the principal bundle of oriented orthonormal frames, or to that of spin frames. We give an explicit formula for the spectrum, with multiplicity, of the Bochner Laplacian r r on V , where r is the Riemannian or Riemannian spin connection. In the case of tensor bundles, we also give the spectrum of the Lichnerowicz Laplacian. T...

First principles studies on the ground state structure, binding energy, spin multiplicity, and the noncollinearity of local spin moments in Fe(n) and Fe(n) (-) clusters and their oxides, viz., Fe(n)O(2) and Fe(n)O(2) (-) have been carried out within a density functional formalism. The ground states of Fe(n) and Fe(n) (-) clusters have collinear spins with a magnetic moment of around 3.0 micro(B...

Motivated by a study of the crossing symmetry of the asymmetric twin or ‘gemini’ representation of the affine Hecke algebra we give a construction for crossing tensor space representations of ordinary Hecke algebras. These representations build solutions to the Yang– Baxter equation satisfying the crossing condition (that is, integrable quantum spin chains). We show that every crossing represen...

Paramagnetic properties of model humic substances (HS) synthesized from 3,4,5-trihydroxybenzoic acid (gallic acid) were studied by means of EPR spectroscopy. A singlet EPR signal without any fine structure was observed for powder sample with spin density 6×10 spin/g, witdh 6.45 Gs and g=2.002. Results of the microwave power saturation pointed to a high dipolar relaxation enhancement. In aqueous...

We analyze the entanglement of SU~2!-invariant density matrices of two spins SW 1 , SW 2 using the PeresHorodecki criterion. Such density matrices arise from thermal equilibrium states of isotropic-spin systems. The partial transpose of such a state has the same multiplet structure and degeneracies as the original matrix with the eigenvalue of largest multiplicity being non-negative. The case S...

Let G = Spin(4n + 1,C) be the connected, simply connected complex Lie group of type B2n and let G = Spin(p, q) (p + q = 4n + 1) denote a (connected) real form. If q / ∈ {0, 1}, G has fundamental group Z2 and we denote the corresponding nonalgebraic double cover by G̃ = S̃pin(p, q). The main purpose of this paper is to describe a symmetry in the set genuine parameters for the various G̃ at certain ...

Monte-Carlo simulations to calculate the number of prompt particles emitted during fission were performed using Fifrelin code and compared recent experimental data. We show that we are able reproduce both neutron ?-ray multiplicity distributions as a function pre-neutron mass fragments single consistent set parameters. This result was made possible by an energy-dependent spin cut-off model, dri...