27,625 research outputs found
Subcellular distribution and arterio-venous differences of synthetic 3H-ß1-23-Corticotrophin-23-amideacetate in the adrenal of rats
Spin effects in strong-field laser-electron interactions
The electron spin degree of freedom can play a significant role in
relativistic scattering processes involving intense laser fields. In this
contribution we discuss the influence of the electron spin on (i) Kapitza-Dirac
scattering in an x-ray laser field of high intensity, (ii) photo-induced
electron-positron pair production in a strong laser wave and (iii) multiphoton
electron-positron pair production on an atomic nucleus. We show that in all
cases under consideration the electron spin can have a characteristic impact on
the process properties and their total probabilities. To this end,
spin-resolved calculations based on the Dirac equation in the presence of an
intense laser field are performed. The predictions from Dirac theory are also
compared with the corresponding results from the Klein-Gordon equation.Comment: 9 pages, 6 figure
Dynamics of quantum spin chains and multi-fermion excitation continua
We use the Jordan-Wigner representation to study dynamic quantities for the
spin-1/2 XX chain in a transverse magnetic field. We discuss in some detail the
properties of the four-fermion excitation continuum which is probed by the
dynamic trimer structure factor.Comment: Presented at the SCES '05 - The International Conference on Strongly
Correlated Electron Systems (Vienna, July 26-30, 2005
Automated competitive protein binding analysis and radioimmunoassay of serum cortisol without prior organic solvent extraction
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