39 research outputs found
Time evolution of spin state of radical ion pair in microwave field: An analytical solution
The paper reports an exact solution for the problem of spin evolution of
radical ion pair in static magnetic and resonant microwave field taking into
account Zeeman and hyperfine interactions and spin relaxation. The values of
parameters that provide one of the four possible types of solution are
analysed. It is demonstrated that in the absence of spin relaxation, besides
the zero field invariant an invariant at large amplitudes of the resonant
microwave field can be found. The two invariants open the possibility for
simple calculation of microwave pulses to control quantum state of the radical
pair. The effect of relaxation on the invariants is analysed and it is shown
that changes in the high field invariant are induced by phase relaxation.Comment: 18 pages, 7 figure
Fractal formation and ordering in random sequential adsorption
We reveal the fractal nature of patterns arising in random sequential
adsorption of particles with continuum power-law size distribution, , . We find that the patterns become more and
more ordered as increases, and that the Apollonian packing is obtained
at limit. We introduce the entropy production rate as a
quantitative criteria of regularity and observe a transition from an irregular
regime of the pattern formation to a regular one. We develop a scaling theory
that relates kinetic and structural properties of the system.Comment: 4 pages, RevTex, 4 postscript figures. To appear in Phys.Rev.Let
Sensitive detection of level anticrossing spectra of nitrogen vacancy centers in diamond
Effect of implantation of high-energy Ne ions on the structure of aluminium-manganese alloy
Translated from Russian (Fiz. khim. obrab. mater. 1998 (1) p. 5-8)Available from British Library Document Supply Centre-DSC:9023.190(9841)T / BLDSC - British Library Document Supply CentreSIGLEGBUnited Kingdo
Evolution of the microstructure of ageing aluminium alloys in high-energy ion implantation
It is well-known that the radiation defects, formed during ion implantation, have a strong effect on the structural-phase condition of the metals and alloys and change of the properties. In previous work, we carried out investigations of the changes of the structure and properties of thermally non-hardened alloys of the system Al-Mn (AMts) implanted with high-energy Ne ions. In this work, these investigations were continued for thermally hardened alloys, i.e. ageing aluminium alloysTranslated from Russian (Fiz. Khim. Orab. Mater. 1998 32(6) p. 9-14)Available from British Library Document Supply Centre-DSC:9023.190(10169)T / BLDSC - British Library Document Supply CentreSIGLEGBUnited Kingdo