Continuous wave CO2 laser driven oxidation of 2-butene and 2-octafluorobutene

1989 ◽  
Vol 54 (11) ◽  
pp. 3083-3087
Author(s):  
Josef Pola ◽  
Josef Vítek
Keyword(s):  
Co2 Laser ◽  
Ground State ◽  
Carbonyl Compounds ◽  
Sulfur Hexafluoride ◽  
Continuous Wave ◽  
Molecular Ground State

CW CO2 laser induced reactions of 2-butene and 2-octafluorobutene with molecular ground state 3O2 oxygen in the presence of sulfur hexafluoride afford products that can be rationalized by means of the earlier proposed mechanism involving transient dioxetane and its cleavage into carbonyl compounds.

CO2 laser-induced decomposition of methyl iodide sensitized by sulfur hexafluoride

1980 ◽  
Vol 45 (7) ◽  
pp. 1910-1919 ◽  
Author(s):  
Klaus Dathe ◽  
Pavel Engst ◽  
Josef Pola ◽  
Milan Horák
Keyword(s):  
Methyl Iodide ◽  
Co2 Laser ◽  
Decomposition Rate ◽  
Sulfur Hexafluoride ◽  
Continuous Wave ◽  
Gaseous Mixtures ◽  
Exciting Photon ◽  
Irradiation Energy ◽  
Induced Decomposition

Gaseous mixtures of methyl iodide and sulfur hexafluoride yield upon irradiation by a continuous-wave CO2 laser iodine, methane, ethane, ethylene and acetylene - the products of methyl iodide decomposition. The decomposition rate and the mutual ratio of the products is dependent on the delivered irradiation energy, the methyl iodide/sulfur hexafluoride ratio and the energy of the exciting photon. Methyl iodide-d3 in the mixture with SF6 behaves similarly as methyl iodide yielding perdeuterated methane, ethane, ethylene, acetylene and iodine.

scholarly journals Thin-Film Processing of Polypropylene and Polystyrene Sheets by a Continuous Wave CO2 Laser with the Cu Cooling Base

Polymers ◽  
2021 ◽  
Vol 13 (9) ◽  
pp. 1448
Author(s):  
Nobukazu Kameyama ◽  
Hiroki Yoshida ◽  
Hitoshi Fukagawa ◽  
Kotaro Yamada ◽  
Mitsutaka Fukuda
Keyword(s):  
Thin Film ◽  
Co2 Laser ◽  
Continuous Wave ◽  
Cw Laser ◽  
Heat Effects ◽  
Film Processing ◽  
Carbon Dioxide Co2 ◽  
A Minor ◽  
Residual Heat ◽  
Thin Film Processing

Carbon dioxide (CO2) laser is widely used in commercial and industrial fields to process various materials including polymers, most of which have high absorptivity in infrared spectrum. Thin-film processing by the continuous wave (CW) laser is difficult since polymers are deformed and damaged by the residual heat. We developed the new method to make polypropylene (PP) and polystyrene (PS) sheets thin. The sheets are pressed to a Cu base by extracting air between the sheets and the base during laser processing. It realizes to cut the sheets to around 50 µm thick with less heat effects on the backside which are inevitable for thermal processing using the CW laser. It is considered that the boundary between the sheets and the base is in thermal equilibrium and the base prevents the sheets from deforming to support the backside. The method is applicable to practical use since it does not need any complex controls and is easy to install to an existing equipment with a minor change of the stage.

Fluorescence anisotropy in indole under two-photon excitation in the spectral range 385–510 nm

2018 ◽  
Vol 20 (30) ◽  
pp. 19922-19931 ◽  
Author(s):  
M. E. Sasin ◽  
A. G. Smolin ◽  
K.-H. Gericke ◽  
E. Tokunaga ◽  
O. S. Vasyutinskii
Keyword(s):  
Propylene Glycol ◽  
Excited States ◽  
Spectral Range ◽  
Ground State ◽  
Fluorescence Anisotropy ◽  
Photon Absorption ◽  
Two Photon Absorption ◽  
Two Photon ◽  
Photon Excitation ◽  
Molecular Ground State

This paper presents the detailed study of two-photon excited fluorescence in indole dissolved in propylene glycol produced by two-photon absorption from the molecular ground state to several high lying excited states.

scholarly journals Threshold of permanent cornea thermal damage due to incidental continuous wave CO2 laser irradiation

2010 ◽  
Vol 14 (2) ◽  
pp. 459-467 ◽  
Author(s):  
Mayada Tahir
Keyword(s):  
Laser Irradiation ◽  
Co2 Laser ◽  
Thermal Damage ◽  
Continuous Wave ◽  
Anterior Part ◽  
Outer Part ◽  
Human Cornea ◽  
Thermal Dose ◽  
Element Analysis ◽  
Reflex Blink

Cornea thermal damage due to incidental continuous wave CO2 laser irradiation is studied numerically based on bio-heat equation. The interaction of laser with tissue leads to a rapid temperature increased in target and the nearby tissue. As the temperature of the eye surface reaches 44?C, a sensation of pain will cause aversion response of the reflex blink and/or shifting away from the source of pain. The aim of the work is to predict numerically the threshold limit of incidental laser power that causes damage to the anterior part of the cornea, which can be healed within 2-5 days as long as damage is not exceeding the outer part of the eye (epithelium). A finite element analysis is used to predict temperature distribution through the cornea where the necroses region can be obtained using thermal dose equation. The thermal dose that required for damaging the cornea is predicted from previously published experimental data on rhesus monkeys and used later as a limit for shrinkage to human cornea. The result of this work is compared by international standard of safety and a good nearby result is obtained which verified the result of this work.

Production of nanomaterials by vaporizing ceramic targets irradiated by a moderate-power continuous-wave CO2 laser

2007 ◽  
Vol 48 (2) ◽  
pp. 292-302 ◽  
Author(s):  
V. N. Snytnikov ◽  
Vl. N. Snytnikov ◽  
D. A. Dubov ◽  
V. I. Zaikovskii ◽  
A. S. Ivanova ◽  
...  
Keyword(s):  
Co2 Laser ◽  
Continuous Wave ◽  
Moderate Power ◽  
Ceramic Targets

The use of a continuous-wave CO2 laser for hardening of wear-resistant high-chromium cast iron

1996 ◽  
Vol 17 (6) ◽  
pp. 607-622 ◽  
Author(s):  
D. M. Gureev ◽  
Yu. M. Matveev ◽  
S. I. Mednikov ◽  
V. K. Shukhostanov ◽  
S. V. Yamshchikov ◽  
...  
Keyword(s):  
Cast Iron ◽  
Co2 Laser ◽  
Continuous Wave ◽  
Wear Resistant ◽  
High Chromium ◽  
High Chromium Cast Iron ◽  
Chromium Cast Iron
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