Processes accompanying stimulated recombination of atoms

The phenomenon of polarization of nuclei in the process of stimulated recombination of atoms in the field of circularly polarized laser radiation is considered. This effect is considered for the case of the proton-electron beams used in the method of electron cooling. An estimate is obtained for the maximum degree of polarization of the protons on components of the hyperfine structure of the 2s state of the hydrogen atom.Comment: 9 page

The probabilities of transitions during stimulated recombination of atoms

The probabilities of transitions of the system to the different final states are determined by the values of the amplitudes of the corresponding individual states during stimulated recombination of atoms.Comment: 8 page

How Standing Electromagnetic Wave Modulates Electron Current

Interaction of nonrelativistic electrons with a standing electromagnetic wave is considered. The modulation amplitude of an electron current in the field of a standing or traveling electromagnetic wave is calculated in the quantum approach.Comment: 8 page

Harmonic Generation with Phase Synchronism

We establish how the intensities of the higher harmonics that arise when a photoelectron recombines with a parent ion depend functionally on the parameters of the laser wave and atomic medium, and estimate the limiting values of these parameters that are needed to observe the phase synchronization effect.Comment: 10 page

Absorption and Emission in a Free Electron Lasers

Multiphoton processes in undulators with plane polarized magnetic field are considered. It is shown that the use of strong magnetic fields in the undulator, for beams with relatively low energy makes it possible to increase substantially the frequencies of the amplified electromagnetic waves without noticeably decreasing the gain. The absorption, emission probabilities and the gain are calculated.Comment: 9 page

How Intense Electromagnetic Wave Affects Photoassociation

The influence of intense electromagnetic wave on photoassociation is investigated. The quantum-mechanical problem of the stimulated transition is considered. The probabilities for stimulated production of mesic atoms in states with large principal quantum numbers are calculated.Comment: 6 page

The Auger Effect and Ionization of Inner Atomic Shells

The Auger effect from inner shells, which arises from resonance excitation of the valence electron of an atom by a weak electromagnetic wave, is discussed.Comment: 7 page

The Probability of the Auger Effect from Inner Shells of the Atom

The mechanism leading to an Auger transition is based on the residual Coulomb interaction between the valence electron and the core electrons. On the assumption that the wave field is switched on adiabatically, the probability of the Auger effect of the inner electrons of the atom is determined.Comment: 9 page

Acceleration in a Periodic Magnetic Field

It is shown that acceleration of particles in a homogeneous magnetic field that varies periodically with time (Alfven magnetic pumping) reduces to a diffusion of the particles in momentum space; a connection is established between the diffusion coefficient and the turbulence spectrum (k-wave number).Comment: 12 page

Investigation of Defect Modes of Chiral Photonic Crystals

Some properties of defect modes of cholesteric liquid crystals (CLC) are presented. It is shown that when the CLC layer is thin the density of states and emission intensity are maximum for the defect mode, whereas when the CLC layer is thick, these peaks are observed at the edges of the photonic band gap. Similarly, when the gain is low, the density of states and emission intensity are maximum for the defect mode, whereas at high gains these peaks are also observed at the edges of the photonic band gap. The possibilities of low-threshold lasing and obtaining high-Q microcavities have been investigated.Comment: 9 pages, 4 figures. arXiv admin note: text overlap with arXiv:1705.0206