A new theoretical approach is presented for the general treatment of nonadiabatic hybrid dynamics (mixing classical and quantum approach) and applied to the postionization of rare-gas trimers. There was an important disagreement between trajectory surface hopping (TSH) or mean field (MF) approaches and the experimental results; noteworthy, with the new method qualitative and almost quantitative agreement is found for the fragmentation ratios of ionic monomers and dimers. For the first time in the theory as in the experiment, the dimers prevail for argon while monomers strongly dominate for the heavier rare gases, krypton and xenon. A new compromise between MF and TSH approaches is proposed and the new method is found quite robust with results not too sensitive to various possible implementations.
The dynamics of ionic rare-gas trimers (Ar(3) (+), Kr(3) (+), and Xe(3) (+)) produced by a sudden ionization of neutral precursors is investigated theoretically with a hybrid classical-quantum method for solving the equations of motion governed by a Hamiltonian obtained from a previously tested diatomics-in-molecules model. Initial conditions are selected with Monte Carlo sampling. Two possibilities for generating the initial electronic state are considered: diabatic (local) and adiabatic (delocalized). The dynamics generally leads to fragmentation, producing either monomer ions or dimer ions in a relatively short time; however, a large number of long-lived metastable trimer ions are also seen in some cases. We have analyzed the dynamics with respect to the fraction of monomer ions produced, the distribution of the kinetic energy of the products, and the distribution of fragmentation times of the trimers. Initial diabatic ionization is associated with much faster fragmentation than adiabatic ionization. Spin-orbit coupling plays an important role in the fragmentation dynamics.
This article is devoted to the problem of the validity of the reciprocity
theorem in high-temperature superconductors (HTSC). The violation of the
reciprocity theorem in zero external magnetic fields has been studied.
Experimental data obtained for two different superconducting materials:
BiSrCaCuO and YBaCuO are presented. Results show that the basic form of the
reciprocity theorem (without consideration of any additional anisotropy) is not
valid near the critical temperature. We assume that the reciprocity theorem
breaking is connected with the existence of an extraordinary transverse
electric field originated from additional anisotropy and more general form of
the reciprocity relations should be valid. However, the origin of this
anisotropy is not clear yet. We suggest that the vortex-antivortex dynamics
model taking into account vortex guiding can be responsible for the observed
effect. Also the explanation based on weak P and T symmetry breaking in HTSC
which is supported by the observation of the spontaneous magnetisation can not
be excluded.Comment: 15 pages, 11 figure
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.