scholarly journals CO2 LASER-DRIVEN REACTIONS IN PURE ACETYLENE FLOW

2017 ◽  
pp. 96-101
Author(s):  
Peter Pikhitsa ◽  
Peter Pikhitsa ◽  
Daegyu Kim ◽  
Daegyu Kim ◽  
Mansoo Choi ◽  
...  
Keyword(s):  
Co2 Laser ◽  
Interstellar Dust ◽  
Photon Absorption ◽  
Carbon Allotropes ◽  
Higher Temperature ◽  
Cw Co2 Laser ◽  
Temperature And Pressure

We show that multiple-photon absorption of radiation from a 10.56 μm cw CO2 laser by intermediates (ethylene, vinylidene) generated in pure acetylene flow makes them decompose to carbon dimers and excited hydrogen. The latter associates with downstream acetylene to feedback those laser absorbing intermediates thus making the reactions self-sustained in the absence of oxygen. This process is different from acetylene self-decomposition that may occur at higher temperature and pressure. The results of our work may be useful for understanding the generation of various carbon allotropes and interstellar dust from acetylene.

Investigations on cw CO2-laser induced welding plasmas using differential interferometry

1999 ◽  
Author(s):  
Henrik Schittenhelm ◽  
Jürgen Müller ◽  
Peter Berger ◽  
Helmut Hügel
Keyword(s):  
Co2 Laser ◽  
Differential Interferometry ◽  
Cw Co2 Laser

Spatial temperature distribution in CW CO2 laser photosensitized reactions

1984 ◽  
Vol 49 (6) ◽  
pp. 1354-1359 ◽  
Author(s):  
Pavel Kubát ◽  
Josef Pola
Keyword(s):  
Temperature Distribution ◽  
Chemical Reactions ◽  
Co2 Laser ◽  
Computational Procedure ◽  
Heat Convection ◽  
Inert Gas ◽  
Spatial Temperature Distribution ◽  
Cw Co2 Laser ◽  
Spatial Temperature

The temperature distribution in gaseous SF6 and SF6-inert gas samples under irradiation with cw CO2 laser measured by a thermocouple technique is confronted with the results of a computational procedure neglecting heat convection. The results are helpful in understanding the effect of the inert gas on the distribution of temperature and the size of the reacting hot volume in the cw laser-photosensitized chemical reactions.

Cw CO2 laser driven oxidation of some perhalogenocycloalkenes

1991 ◽  
Vol 56 (2) ◽  
pp. 398-405 ◽  
Author(s):  
Josef Pola ◽  
Jaroslav Včelák ◽  
Zdeněk Chvátal
Keyword(s):  
Co2 Laser ◽  
Total Pressure ◽  
Diels Alder ◽  
Title Reaction ◽  
Consecutive Reactions ◽  
Cw Co2 Laser

The title reaction of hexafluorocyclobutene, 1,2-dichloro-3,3,4,4-tetrafluorocyclobutene and decafluorocyclohexene studied at total pressure 13.3 and 16 kPa yield oxalyl halides COX.COX (X = F, Cl) and C2F4 that undergo consecutive reactions to COF2, CO and X2. The oxidation of decafluorocyclohexene is preceded by retro-Diels-Alder decomposition affording hexafluorocyclobutene and C2F4. Two alternative mechanisms for the oxidation of the cyclobutenes are presented, one involving a novel cleavage of intermediary bicyclic dioxetanes. The decomposition of oxalyl fluoride into COF2 and CO is favored over its oxidation.

Influence of a radial inhomogeneity of the active medium on the output radiation power from a cw CO2 laser with fast axial flow

1996 ◽  
Author(s):  
Michail G. Galushkin ◽  
Vladimir S. Golubev ◽  
V. V. Dembovetsky ◽  
Yuri N. Zavalov ◽  
Valentina Y. Zavalova
Keyword(s):  
Active Medium ◽  
Co2 Laser ◽  
Radiation Power ◽  
Axial Flow ◽  
Output Radiation ◽  
Radial Inhomogeneity ◽  
Cw Co2 Laser ◽  
Output Radiation Power

ChemInform Abstract: CW CO2 Laser Driven Oxidation of Some Perhalogenocycloalkenes.

ChemInform ◽  
2010 ◽  
Vol 22 (25) ◽  
pp. no-no
Author(s):  
J. POLA ◽  
J. VCELAK ◽  
Z. CHVATAL
Keyword(s):  
Co2 Laser ◽  
Cw Co2 Laser

Activation and cleaning of oxide surfaces by a cw CO2 laser

1984 ◽  
Vol 136 (1) ◽  
pp. L19-L24 ◽  
Author(s):  
Alison D. Abbate ◽  
Tomoji Kawai ◽  
C.Bradley Moore ◽  
Chi-Tsung Chin
Keyword(s):  
Co2 Laser ◽  
Oxide Surfaces ◽  
Cw Co2 Laser

Irradiation of CW-CO2 laser on a powder target. Formation of fullerene film from graphite powder

2003 ◽  
Vol 378 (5-6) ◽  
pp. 474-480 ◽  
Author(s):  
Seisuke Kano ◽  
Masamichi Kohno ◽  
Kaname Sakiyama ◽  
Shinya Sasaki ◽  
Nobuhiro Aya ◽  
...  
Keyword(s):  
Co2 Laser ◽  
Graphite Powder ◽  
Powder Target ◽  
Cw Co2 Laser

scholarly journals Carbon Isotope Selective Separation From MPD of CF3Br With a TEA CO2 Laser

1998 ◽  
Vol 18 (1-2) ◽  
pp. 85-97
Author(s):  
J. I. del Barrio ◽  
R. Fernández Cézar ◽  
F. M. G.- Tablas
Keyword(s):  
Enrichment Factor ◽  
Carbon Isotope ◽  
Co2 Laser ◽  
Mass Spectrometric ◽  
Spectrometric Analysis ◽  
Excitation Wavelength ◽  
Tea Co2 Laser ◽  
Polyatomic Gases ◽  
Temperature And Pressure ◽  
Crucial Parameter

Pure CF3Br and mixtures of this substance with monoatomic (He, Ar and Xe), homonuclear diatomic (H2, D2, N2), polyatomic gases (CF4) and NO have been irradiated with a TEA CO2 laser. Carbon-13 enrichment factor and carbon-13 selectivity have been estimated from the mass spectrometric analysis of the undissociated CF3Br as a function of excitation wavelength, fluence, temperature and pressure. The irradiating wavelength is a crucial parameter to achieve enrichment. The nature of the added gas also affects considerably selectivity. Best enrichment is achieved in mixtures with NO due to its radical-like character.

scholarly journals ABNORMAL TEMPERATURE FLUCTUATION OF STAINLESS STEEL IRRADIATED BY CW CO2 LASER

1999 ◽  
Vol 48 (12) ◽  
pp. 2246
Author(s):  
WEI XUE-QIN ◽  
ZHENG QI-GUANG ◽  
GU JIAN-HUI ◽  
LI ZAI-GUANG
Keyword(s):  
Stainless Steel ◽  
Co2 Laser ◽  
Temperature Fluctuation ◽  
Cw Co2 Laser ◽  
Abnormal Temperature
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