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          3C and 18O isotope enrichment by vibrational energy exchange pumping of CO

Bergman, R. C.; Homicz, Gregory F.; Rich, John Martin; Wolk, Gary L.

doi:10.1063/1.444866

Cited by 43 publications

(17 citation statements)

References 18 publications

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“…Although the detailed mechanism for the formation of this deposit has still not been determined, it is considered to be a mixture of polymeric forms of carbon suboxide C 3 O 2 . 8) To analyze the potential throughput of the isotopically enriched products of this process, the deposited polymer was oxidized to CO 2 in a measured quantity of oxygen, and then the amount of carbon atom in the polymer deposit was determined from the CO 2 quantity. The oxidation of polymer was carried out by additional electrical discharge.…”

Section: Methodsmentioning

confidence: 99%

“…This high carbon yield in polymer can be explained by end carbons in C 3 O 2 (OC-CCO) as a result of reactions (7) and (8). Both of the end carbon atoms of C 3 O 2 formed through these steps would be unenriched in 13 C. 19,20) Apparently it seems reasonable to suppose that the polymer also contains the unenriched carbon atoms.…”

Section: Reaction Yields and Atomic Mass Conservation Of Productsmentioning

confidence: 99%

“…[3][4][5][6] And a few experimental studies have shown a high isotope enrichment potential. [7][8][9] Much of this early work is reviewed by Rich and Bergman. 11)…”

Section: Introductionmentioning

confidence: 99%

“…Since this isotope separation method was first suggested by Belenov et al, 2) there have been a large number of papers on this isotope separation phenomena. [3][4][5][6][7][8][9][10][11][12] Theoretical analyses have shown its attractive potential that in such process the reaction yield and enrichment factor are relatively high and the energy expenditure per separated atom is quite low. [3][4][5][6] And a few experimental studies have shown a high isotope enrichment potential.…”

Section: Introductionmentioning

confidence: 99%

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Carbon and Oxygen Isotope Separation by Plasma Chemical Reactions in Carbon Monoxide Glow Discharge

Mori

Akatsuka

Suzuki

2001

Journal of Nuclear Science and Technology

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The separation of carbon and oxygen isotopes in CO glow discharge has been studied. The isotope enrichment in the products was measured by quadru-pole mass spectrometer. The reaction yield and empirical formula of solid phase products were determined by the gas-volumetric analysis. The stable products obtained in our experiment are CO 2 and solid polymers formed on the discharge wall. The polymer consists of both carbon and oxygen and the oxygen/carbon mole ratio in the polymer is 0.35±0.05. The isotope enrichment coefficients show a strong negative dependence on discharge current though the relative reaction yields have an opposite tendency. Consequently, the maximum isotope enrichment coefficients for 13 C in wall deposit of 2.31 and for 18 O in CO 2 of 1.37 are obtained when the discharge current and the reaction yields are minimum in our experimental range. The experimental results of isotope enrichment have been compared with theoretical values estimated by an analytical model of literature. The dilution mechanism of the isotope enrichment of stable products is inferred from the isotopic distributions of 13 C and 18 O in products and theoretical predictions for isotope enrichment.

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Section: Methodsmentioning

confidence: 99%

Section: Reaction Yields and Atomic Mass Conservation Of Productsmentioning

confidence: 99%

“…[3][4][5][6] And a few experimental studies have shown a high isotope enrichment potential. [7][8][9] Much of this early work is reviewed by Rich and Bergman. 11)…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Carbon and Oxygen Isotope Separation by Plasma Chemical Reactions in Carbon Monoxide Glow Discharge

Mori

Akatsuka

Suzuki

2001

Journal of Nuclear Science and Technology

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“…17,18 Plasma torch is used to deposit diamond films with high deposition rate. 19 a͒ Other methods, such as fast heating, 20,21 optical pumping, [22][23][24] and substrate pretreatment, 25,26 have also been studied.…”

Section: Introductionmentioning

confidence: 99%

Enhanced chemical vapor deposition of diamond by wavelength-matched vibrational excitations of ethylene molecules using tunable CO2 laser irradiation

Líu

Xie

Gao

et al. 2009

Journal of Applied Physics

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Wavelength-matched vibrational excitations of ethylene ͑C 2 H 4 ͒ molecules using a tunable carbon dioxide ͑CO 2 ͒ laser were employed to significantly enhance the chemical vapor deposition ͑CVD͒ of diamond in open air using a precursor gas mixture of C 2 H 4 , acetylene ͑C 2 H 2 ͒, and oxygen ͑O 2 ͒. The CH 2 -wag vibration mode ͑ 7 ͒ of the C 2 H 4 molecules was selected to achieve the resonant excitation in the CVD process. Both laser wavelengths of 10.591 and 10.532 m were applied to the CVD processes to compare the C 2 H 4 excitations and diamond depositions. Compared with 10.591 m produced by common CO 2 lasers, the laser wavelength of 10.532 m is much more effective to excite the C 2 H 4 molecules through the CH 2 -wag mode. Under the laser irradiation with a power of 800 W and a wavelength of 10.532 m, the grain size in the deposited diamond films was increased by 400% and the film thickness was increased by 300%. The quality of the diamond crystals was also significantly enhanced.

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Sonochemical Disproportionation of Carbon Monoxide in Water: Evidence for Treanor Effect during Multibubble Cavitation

et al. 2009

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Eighty years after the discovery of ultrasound-induced chemical processes, [1] known as sonochemistry, it remains a subject of extensive research. [2] It is generally accepted that sonochemistry arises from acoustic cavitation, which is the nucleation, growth, and implosive collapse of microbubbles in liquids subjected to ultrasonic waves. Nevertheless, debate still continues over the origin of extreme conditions created by the bubble collapse. Usually the sonochemical reactions are interpreted according to Flynns "thermal" hypothesis presuming adiabatic or quasi-adiabatic transient heating of gases and vapours inside the cavitating bubble. [3] However, the recent observation of light emission from positively charged O 2 + species during single-bubble collapse in H 2 SO 4 provided evidence for nonthermal plasma formation inside the bubble. [4] The relationship between the mechanisms of single-bubble and multibubble cavitations is still not clear. Recent studies of multibubble sonoluminescence in H 2 SO 4 and water revealed some similarities in the origin of both kinds of processes. [5,6] In this view thermal equilibration during the cavitation event remains an important question that is not yet resolved. Herein, we report the first "chemical" evidence for nonequilibrium molecule vibrational excitation occurring during multibubble cavitation.We studied the ultrasonically driven disproportionation of carbon monoxide (DCO) in water saturated with a CO/Ar gas mixture. To our knowledge, this reaction had never been studied under ultrasonic irradiation. By contrast, the plasmachemical DCO reaction in the gas phase has been a very active topic of research as working media for CO lasers and as a promising method for carbon isotope separation. [7] According to published results, the strongly endothermic DCO reaction (DH = 5.5 eV mol À1 , E a = 6 eV mol À1 ) can be significantly accelerated by the vibrational excitation of CO molecules. The population of highly vibrational states CO*(n n ), n 40, occurs through an anharmonic vibrationto-vibration pumping mechanism (V-V), known as the

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1 3C and 18O isotope enrichment by vibrational energy exchange pumping of CO

Cited by 43 publications

References 18 publications

Carbon and Oxygen Isotope Separation by Plasma Chemical Reactions in Carbon Monoxide Glow Discharge

Carbon and Oxygen Isotope Separation by Plasma Chemical Reactions in Carbon Monoxide Glow Discharge

Enhanced chemical vapor deposition of diamond by wavelength-matched vibrational excitations of ethylene molecules using tunable CO2 laser irradiation

Sonochemical Disproportionation of Carbon Monoxide in Water: Evidence for Treanor Effect during Multibubble Cavitation

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