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Vol 45, No 3 (2018)
- Year: 2018
- Articles: 8
- URL: https://journals.rcsi.science/1068-3356/issue/view/14125
Article
Vibrationally Excited Ozone Relaxation by CO
Abstract
Time profiles of ozone concentration after pulsed UV laser photolysis in the O2- O3-Ar-CO mixture, measured using time-resolved absorption spectroscopy, are presented. The experimental results show the dominance of the stabilization channel over the reactive one for the interaction between the vibrationally excited ozone molecule O3(υ) and carbon monoxide CO. The rate constant of the process O3(υ)+CO→O3 + CO, obtained by processing experimental data by the kinetic modeling method is (1.5 ± 0.2) · 10−13 cm3/s.
67-70
Effect of Amplitude and Phase Distortions on the Formation of Light Fields with Rotating Intensity Distribution
Abstract
The results of numerical simulation and experiments on the effect of amplitude and phase distortions on the formation of the light fields with the rotation of intensity distribution during propagation are presented. Practically significant cases of amplitude and phase distortions with regular and random inhomogeneity types are considered.
71-74
Laser Ablation of Titanium in Cryogenic and Room-Temperature Liquids
Abstract
The results of processing of an OT4-0 titanium plate surface in media of C2H5OH + H2O and liquid argon by radiation of a pulse-periodic Nd:YAG laser with subnanosecond pulses are presented. A change in current-carrying properties of structures synthesized in C2H5OH + H2O is studied. The effect of subsequent influence of HNO3 + HF acid solution on laser-induced structures is considered.
75-78
On the Development of Controllable Sources of Single-Photon States with an Orbital Angular Momentum on the Basis of Spontaneous Parametric Down-Conversion of Light
Abstract
Methods for beam shaping with nonzero orbital angular momentum are studied using diffraction optical elements with the purpose of developing a source of single-photon states based on spontaneous parametric down-conversion of light in the LiNbO3 crystal in the cavity resonator. The probability of the coincidence of the number of photocounts in detecting signal and idle fields under pumping by a beam with the orbital angular momentum is simulated.
79-82
Diode Laser with External Double Reflector for Gas Analysis
Abstract
A diode laser configuration with a short external cavity in which an additional reflector is formed by a packet of two thin cover glasses is proposed. The use of such external cavities in combination with diode lasers based on quantum-well heterostructures is promising for Doppler broadening spectroscopy and the cases where a wide range of continuous tuning at moderate requirements for the laser linewidth is important.
83-86
Quadrupole Interaction Contribution to the Hyperfine Structure of P-States in Muonic Lithium, Beryllium, and Boron Ions
Abstract
The contribution of the quadrupole interaction to the hyperfine structure of the spectrum of the energy of muonic lithium, beryllium, and boron ions is calculated within the quasipotential method in quantum electrodynamics. The numerical results obtained improve previous calculations due to the consideration of new corrections. They can be used for comparison with future experimental data.
87-90
Incoherent Photon Echo in an Inhomogeneous Ensemble of Semiconductor Colloidal Quantum Dots at Low Temperatures
Abstract
A simple and effective technique for fabricating homogeneous films of colloidal quantum dots is developed. Incoherent photon echo signals in the prepared thin films of quantum dots are detected and studied in a wide range of cryogenic temperatures (from 4.5 to 50 K). The temperature dependence of the inverse optical dephasing time is constructed and possible mechanisms of ultrafast dephasing are analyzed in the indicated temperature range.
91-94
Study of Formation Mechanisms of Photo-Induced Dichroism in Azo-Containing Polymer Films
Abstract
Photoinduced dichroism (PD) in azo-containing polymers can result from chromophore orientation and/or cis-isomer accumulation. The PD formation mechanism of azochrommophores DO3 (DisperseOrange 3) doped in polymethyl methacrylate (PMMA) at a temperature varying from –20 to +120 °C is studied by UV-visible spectroscopy. It is shown that the main PD formation mechanism at T < 0°C and T > 60°C is cis-isomer accumulation and trans-isomer photoorientation, respectively.
95-98