scholarly journals Фотоэлектрические свойства нитевидных кристаллов ZnO

2018 ◽  
Vol 52 (7) ◽  
pp. 741
Author(s):  
П.С. Шкумбатюк
Keyword(s):  
Laser Radiation ◽  
Gas Phase ◽  
Barrier Structure ◽  
Continuous Action ◽  
Potential Barriers ◽  
Photoelectric Properties

AbstractThe photoelectric properties of ZnO whiskers obtained from the gas phase by the evaporation of a powder and metallic Zn under the continuous action of CO_2 laser radiation are studied. On the basis of investigation of the InO–ZnO barrier structure, the mechanism of the photoconductivity of crystal ZnO caused by potential barriers is proposed.

Effect of infrared laser radiation on gas-phase pyrolysis of ethane

2018 ◽  
Vol 134 ◽  
pp. 122-129 ◽  
Author(s):  
N. Masyuk ◽  
A. Sherin ◽  
V.N. Snytnikov ◽  
Vl.N. Snytnikov
Keyword(s):  
Laser Radiation ◽  
Gas Phase ◽  
Infrared Laser

The Feature of Laser Deposition of Polymeric Composite Films from an Active Gas Phase

2011 ◽  
Vol 480-481 ◽  
pp. 30-35 ◽  
Author(s):  
Zhu Bo Liu ◽  
Xiao Hong Jiang ◽  
Bing Zhou ◽  
M.A. Yarmolenko ◽  
D.L. Gorbachev ◽  
...  
Keyword(s):  
Laser Radiation ◽  
Gas Phase ◽  
Composite Films ◽  
Polymeric Composite ◽  
Laser Wavelength ◽  
Attenuated Total Reflection ◽  
Silicon Films ◽  
Organic Silicon ◽  
Order Degree ◽  
532 Nm

The organic-silicon films, polytetrafluorethylene (PTFE) films and its composite films with copper have been fabricated from an active gas phase by pulse laser dispersion from initial powder species. The features of all films obtained were studied with the application of attenuated total reflection-Fourier transform infrared (ATR-FTIR) spectroscopy. Our results suggest that the wavelength of laser radiation impact a strong effect on the molecular structure of all films. Specifically, the peaks corresponding to the detachment of C-H bonds in the organic-silicon films and its Cu doped films at a laser wavelength of 532 nm and the destruction of the Si-O-Si groups at 266 nm due to the ultraviolet radiation have been observed. Interestingly, the concentration of Si-С6Н5 groups relative increases with a decremental of the wavelength of laser radiation. In addition, the PTFE films formed at a laser wavelength of 355 nm presented a lower order degree and high amorphous phase, while PTFE-Cu composite films at laser wavelength 266 nm exhibited enhanced crystallinity due to the presence of copper species, wherein being served as nucleation centers. Remarkably, the wavelengths of laser radiation nearly play no effect on the orderness of PTFE-Cu composite films.

Photoelectric properties of bimodal arrays of InAs/GaAs quantum dots grown by means of gas phase epitaxy

2013 ◽  
Vol 77 (1) ◽  
pp. 53-55
Author(s):  
A. P. Gorshkov ◽  
N. S. Volkova ◽  
I. A. Karpovich ◽  
A. V. Zdoroveishev ◽  
I. A. Polova
Keyword(s):  
Quantum Dots ◽  
Gas Phase ◽  
Photoelectric Properties

The Effect of Metal Atoms and Ligand Combinations in Organometallics on Excimer Laser Photoproducts and Yields

1988 ◽  
Vol 131 ◽  
Author(s):  
Y. Zhang ◽  
M. Stuke
Keyword(s):  
Mass Spectrometry ◽  
Laser Radiation ◽  
Gas Phase ◽  
Excimer Laser ◽  
Systematic Study ◽  
Ionization Mass ◽  
Laser Ionization ◽  
Metal Atoms ◽  
Excimer Laser Radiation

ABSTRACTA systematic study to find the role of different metal atoms and ligand combinations on the yield of the photoproducts generated upon irradiation of gas phase organometallics (i.e. metalalkyls) by uv excimer laser radiation was performed using laser ionization mass spectrometry.

A comparative study of the SF6-sensitized interaction of a cw-CO2 laser radiation with methyltrichloro derivatives of carbon, silicon and germanium

1981 ◽  
Vol 46 (12) ◽  
pp. 3088-3096 ◽  
Author(s):  
Josef Pola ◽  
John M. Bellama ◽  
Václav Chvalovský
Keyword(s):  
Laser Radiation ◽  
Comparative Study ◽  
Laser Irradiation ◽  
Gas Phase ◽  
Sulfur Hexafluoride ◽  
Phase Interaction ◽  
Cw Co2 Laser ◽  
Co2 Laser Radiation ◽  
Silicon And Germanium ◽  
Derivatives Of

A comparative study of the gas-phase interaction of methyltrichloro derivatives of carbon, silicon and germanium (CH3MCl3 where M = C, Si and Ge) with sulfur hexafluoride either excited by a cw-CO2 laser radiation or under conventional static pyrolytic conditions is reported. 1,1,1-Trichloroethane and methyltrichlorogermane do not react with SF6 under laser irradiation and undergo their decomposition leading to the same products as afforded by heating: CH3CCl3 yields Cl2C=CH2 and HCl, and CH3GeCl3 gives HGeCl3 along with CH4 and C2H2. Mixtures of methyltrichlorosilane and SF6 afford under the both conditions products of the CH3SiCl3 decomposition -CH4, C2H2, HCl and SiCl4 and products of the CH3SiCl3-SF6 reaction -SiF4, SCF2 and CS2. Possible reasons for the different reactivity of CH3MCl3 compounds toward SF6 are briefly discussed. The decompositions of CH3GeCl3 to HGeCl3 offers new way for the preparation of the latter compound.

Excitation and dissociation of molecules by femtosecond IR laser radiation in the gas phase and on dielectric surfaces

2013 ◽  
Vol 43 (4) ◽  
pp. 320-325 ◽  
Author(s):  
V O Kompanets ◽  
Vladimir B Laptev ◽  
Aleksandr A Makarov ◽  
S V Pigulskii ◽  
Evgenii A Ryabov ◽  
...  
Keyword(s):  
Laser Radiation ◽  
Gas Phase ◽  
Dielectric Surfaces ◽  
Ir Laser

Photoelectric properties of GaAs p-n-junction under illumination of intense laser radiation

2014 ◽  
Author(s):  
S. Ašmontas ◽  
J. Gradauskas ◽  
A. Sužiedėlis ◽  
A. Šilėnas ◽  
V. Vaičikauskas ◽  
...  
Keyword(s):  
Laser Radiation ◽  
Intense Laser ◽  
Photoelectric Properties ◽  
Intense Laser Radiation

scholarly journals Nucleation under the impact of pulsed laser radiation

2021 ◽  
Vol 34 (06) ◽  
pp. 1785-1792
Author(s):  
Sergey Nikoloaevich Maksimovsky ◽  
Aleksey Urievich Stavtsev
Keyword(s):  
Laser Radiation ◽  
Gas Phase ◽  
High Power ◽  
High Pressures ◽  
Process Conditions ◽  
Extended Model ◽  
High Power Laser ◽  
Power Laser ◽  
The Impact ◽  
High Power Laser Radiation

The article shows theoretical calculations of nucleation in nonequilibrium conditions under the impact of high-power laser radiation, and their experimental confirmation. The phase transition during homogeneous nucleation without seed in the gas phase has long been studied by various scientists in the developed countries of the world. Several nucleation theories have been developed, however, they are difficult or impossible to apply to fast-flowing crystallization processes occurring at high pressures and temperatures that take place when using high-power laser radiation in the gas phase. In this article, an extended model of nucleation in the gas phase is developed using traditional thermodynamic concepts, as well as the influence of the process conditions on the equilibrium concentration and the formed particle size within the range from 100 nm to 1 micron is predicted. The article describes experiments on growing structures on plastic substrates containing inside optical inhomogeneities in the form of diffraction gratings. The calculation of the sublimation evaporation pressures of aluminum is conducted depending on different laser radiation power densities. The authors obtained images of nascent structures by electron microscopy and demonstrated the possibility of observing the nucleation phases in situ by changing the power of laser radiation of the sample.

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