Indirect Phase Detection of NMR Spinor Transitions

Indirect phase detection of NMR spinor transitions.

The behavior of quantum mechanical state functions under selective rotations is discussed. If a t~o-level transition is phase shifted vrith composite z pulses, the component state function shared ~ith a connected transition can be multiplied by i, thereby shifting the corresponding coherence into an orthogonal channel. Application to the sensitive indirect detection of NMR transitions is demons...

Phase transitions in spinor quantum gravity on a lattice

Alexey A. Vladimirov and Dmitri Diakonov 1 Ruhr-Universität Bochum, Bochum D-44780, Germany 2 Petersburg Nuclear Physics Institute, Gatchina 188300, St. Petersburg, Russia 3 St. Petersburg Academic University, St. Petersburg 194021, Russia Abstract We construct a well-defined lattice-regularized quantum theory formulated in terms of fundamental fermion and gauge fields, the same type of degrees...

NUMERICAL SIMULATIONS OF THE PHASE TRANSITIONS IN CLUSTERS

We have studied the phase transitions in atomic clusters by molecular dynamics simulation, assuming Lennard-Jones interatomic pair potential. Calculations are performed by DAP parallel computer. The results are analyzed by simulating their orientational distribution plots (dot-plot), and neutron diffraction patterns. It is shown that all the main features of the bulk phase transitions are e...

Critical dynamics at incommensurate phase transitions and NMR relaxation experiments

We study the critical dynamics of crystals which undergo a second-order phase transition from a hightemperature normal phase to a structurally incommensurate ~IC! modulated phase. We give a comprehensive description of the critical dynamics of such systems, e.g., valid for crystals of the A2BX4 family. Using an extended renormalization scheme, we present a framework in which we analyze the phas...

Phase transitions in porous media studied by NMR spectroscopy