Mössbauer studies of amorphous ferromagnets FeNiSiB nearT c

Our Mössbauer measurements on amorphous ferromagnets of FeNiSiB type are analysed just below T_c. The temperature dependence of the shape of the hyperfine field distribution and the effective exponent β is presented. The influence of quadrupole interaction is discussed.     

How far the substituent effects in disubstituted cyclohexa-1,3-diene derivatives differ from those in bicyclo[2.2.2]octane and benzene?

Structural Chemistry - Substituents effects in cyclic diene derivatives are studied using quantum chemical modeling and compared to the corresponding effects in aromatic (benzene) and fully...     

Substituent effects of nitro group in cyclic compounds

Structural Chemistry - Numerous studies on nitro group properties are associated with its high electron-withdrawing ability, by means of both resonance and inductive effect. The substituent effect...     

Non-equilibrium quantum statistical mechanics of a damped harmonic oscillator

we give some general remarks on the quantization of systems where the energy operator is not conserved in time. Explicitly, we consider a damped harmonic oscillator and transform the corresponding Schrödinger-Langevin equation to the dual picture where the observables are time dependent but not the states. In this picture the time evolution will be described by a completely positive dynamical semigroup. At finite temperatures the situation is more complicated.     

Second quantization of classical nonlinear relativistic field theory

The construction of a relativistic interacting local quantum field is given in two steps: first the classical nonlinear relativistic field theory is written down in terms of Poisson brackets, with initial conditions as canonical variables: next a representation of Poisson bracket Lie algebra by means of linear operators in the topological vector space is given and an explicit form of a local interacting relativistic quantum field \(\hat \Phi \) is obtained. The construction of asymptotic local relativistic fields \(\hat \Phi _{in} \) and \(\hat \Phi _{out} \) associated with \(\hat \Phi \) is also given.     

Critical behaviour of Fe and Ni by Mössbauer spectroscopy

In the work reported here, our experimental studies, below an above T_c, on the critical behaviour of Fe and Ni are presented. The measurements were made on Fe in an absorber experiment and on the source foil in the case of Ni. The determined statical and dynamical exponents, and corrections to scaling have been compared to other experimental results and theoretical predictions.