We study the impact of the negatively charged nitrogen-vacancy (NV–) center density on the lattice strain resulting in the splitting of the optically detected magnetic resonance of HPHT diamond. A simple model, taking into account the presence of the interstitial carbon atoms, acting like a wedge force on the crystal lattice, explains the broadening and splitting of the optically detected magnetic resonance of the ensemble of NV– centers at densities within the range of 1013 ÷ 1014 cm−3. This model uses a complete generalized spin Hamiltonian, takes into account the strain-effect of each center in the ensemble and gives good agreement with experimental data.

1.Nonlinear interference effects based on atomic coherence attract special continuously increasing interest in recent time. These effects are widely applied in ultra-high-resolution nonlinear spectroscopy [1,2], metrology (atomic clocks and magnetometers) [3], laser cooling [4], and other modern areas of laser physics.The typical induced-absorption resonance has the shape of a narrow dip (electromagnetically induced transparency, EIT) or peak (electromagnetically induced absorption, EIA). The first type of the resonance has long been known (see, e.g., [5,6]) and thereby is better studied than the EIA resonance, which was observed in 1998 in two-frequency excitation [7] and then in the Hanle configuration [8]. As was shown in [9,10], EIA is physically caused by the transfer of anisotropy (Zeeman coherence) from the excited level to the ground one. The possibility of change from EIA to EIT was analyzed in [11] for the Hanle configuration in dependence on depolarizing relaxation in the exited state.In this work, the parameters (amplitude, width, and amplitude-to-width ratio) of the magneto-optical resonance are studied as functions of the ellipticity of the light wave, which resonantly excites the closed optical transition F g F e in the atomic gas, where F g and F e are the total angular momenta of the atom in the ground and excited states, respectively. The total absorption of the traveling light wave at a certain magnetic field is a spectroscopic signal. In the case under consideration, the magnetic field is directed along the wave vector of the light wave (Hanle configuration). In contrast to previous works (e.g., [8,12,13]), where the case of linear polarization was considered, we analyze the general case of the elliptic polarization of the electromagnetic wave with emphasis on the EIA resonance. Certain new features attributed to the Doppler effect for atoms in a gas are theoretically revealed. These features are experimentally corroborated for the F g = 2 F e = 3 transition in the D 2 line of the 87 Rb atom.2. We consider the resonance interaction of the elliptically polarized plane traveling light wave with atoms where the closed optical transition F g F e occurs between the ground and excited states. Here, ω and E 0 are the frequency and amplitude of the light field and the unit complex elliptic-polarization vector has the form where e ± 1 = e x ± i e y )/ are the cyclic basis vectors. The ellipticity parameter ε is defined in the interval −π /4 ≤ ε ≤ π /4 so that | tan( ε ) | is the ratio of the small semiaxis of the ellipse to its large semiaxis and the signThe parameters of nonlinear absorption magneto-optical resonances in the Hanle configuration have been studied as functions of the ellipticity of a traveling light wave. It has been found that these parameters (amplitude, width, and amplitude-to-width ratio) depend strongly on the polarization of the light wave. In particular, the resonance amplitude can increase by more than an order of magnitude when the polarization changes from linear to optimal el...

Expressions for the angular distribution of tritons emitted from nuclei bombarded with deuterons have been obtained using Born's approximation and the non. perturbation method of Butler. Discussion of the effect of different forms of the triton wave function on the angular distribution is given. The theory is shown to explain the experimental angular distributions satisfactorily. THE T H E O R Y O F (d, t) REACTIONS X P E R I M E N T S on the emission of tritons from nuclei bombarded withdeuterons reveal angular distributions similar to those observed in (d, p) E and (d, d') reactions. This leads one to expect that this reaction also is

Here we present an equivalent circuit model for the study of the surface discharge induced plasma chemical process (SPCP). The simplified model consists of a series of gaseous and ceramic capacitors. The discharge characteristics of the SPCP device are investigated based on this model. The discharge current, the average length of the streamer filaments, the inception breakdown voltage, the density of the surface charges, the dynamic capacity and the effective energy associated with the discharge process are simulated. The computed results are in good agreement with the experimental data.