Isotope separation by multiphoton dissociation of molecules using high-power CO<sub>2</sub>laser radiation. Scaling of the process for carbon isotopes

Abdushelishvili, G. I.; Avatkov, O N; Баграташвили, В.Н.; Baranov, V Yu; Bakhtadze, A. B.; Велихов, Евгений Павлович; Vetsko, V. M.; Gverdtsiteli, I. G.; Dolzhikov, V. S.; Esadze, G.G.; Kazakov, S. A.; Kolomiĭskiĭ, Yu R; Letokhov, V. S.; Pigul’skii, S V; Pis'mennyǐ, V. D.; Ryabov, E. A.; Tkeshelashvili, G. I.

doi:10.1070/qe1982v012n04abeh012223

Cited by 30 publications

(6 citation statements)

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“…The multiple photon dissociation (MPD) of polyatomic molecules has been studied by several authors. − We have studied the MPD of pure CF 3 Br and mixtures with monatomic (He, Ar, and Xe), diatomic (H 2 , D 2 , and N 2 ), and polyatomic (CF 4 ) gases. , The experiments were carried out by irradiating with a transversely excited atmospheric (TEA) CO 2 laser, at different temperatures, pressures, and fluences. Mixtures of CF 3 Br with different gases − have also been studied by MPD, following the effect of the presence of these gases on the carbon-13 enrichment. They observed that the enrichment factor tends toward 1 as the total pressure increases, when irradiating with laser lines between 1035 and 1050 cm -1 , as we do.…”

Section: Introductionmentioning

confidence: 99%

“…10,11 The experiments were carried out by irradiating with a transversely excited atmospheric (TEA) CO 2 laser, at different temperatures, pressures, and fluences. Mixtures of CF 3 -Br with different gases [12][13][14][15][16] have also been studied by MPD, following the effect of the presence of these gases on the carbon-13 enrichment. They observed that the enrichment factor tends toward 1 as the total pressure increases, when irradiating with laser lines between 1035 and 1050 cm -1 , as we do.…”

Section: Introductionmentioning

confidence: 99%

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Effect of NO on the Isotopically Selective Dissociation of CF₃Br with a Transversely Excited Atmospheric CO₂ Laser

1998

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Mixtures of CF3Br and NO have been irradiated with a transversely excited atmospheric (TEA) CO2 laser under different experimental conditions. The isotopic composition of the undissociated CF3Br has been analyzed by mass spectrometry. 13C enrichment factor in the remaining CF3Br and 13C selectivity have been estimated and compared with those obtained with the pure substance and previous mixtures of CF3Br + X (X = He, Ar, Xe, H2, D2, N2, CF4). The presence of NO produces a remarkable improvement of the enrichment factor. The trapping ability of NO, due to its radical-like character, improves drastically the results obtained previously.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effect of NO on the Isotopically Selective Dissociation of CF₃Br with a Transversely Excited Atmospheric CO₂ Laser

1998

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“…In the late seventies, several groups all over the world investigated the IR laser chemistry of trifluorohalomethanes [8][9][10][11][12] using a pulsed carbon-di-oxide laser. The C-F stretching mode of these species has a well resolved isotopic shift of about 25 cm -1 for the carbon isotopes which can be readily excited by a pulsed CO 2 laser.…”

Section: Laser Isotope Separation Schemesmentioning

confidence: 99%

Control strategies for laser separation of carbon isotopes

2002

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Laser isotope separation (LIS) by infrared laser chemistry of polyatomic molecules has come a long way since its discovery. The last decade has seen considerable efforts in scaling up of the process for light elements like carbon, oxygen and silicon. These efforts aim at ways to improve both the enrichment factor and the throughput. The achievement is quite significant especially for carbon isotope separation wherein macroscopic operating scales have been realized. We report our studies on the IR laser chemistry of two promising systems, viz. neat CF 2 HCl and CF 3 Br/Cl 2 . We have investigated conditions for optimizing the dissociation yield and selectivity using natural samples containing 1⋅1% C-13. We also highlight our current efforts for scaling up the process. These include the design aspects of a photochemical reactor with multipass refocusing Herriott optics for efficient photon utilization, development of a cryogenic distillation set up and a preparative gas chromatograph for large scale separation/collection of the isotopically enriched photoproduct in the post-irradiation stage.

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“…The process of isotopic selective multiphoton dissociation (MPD) of polyatomic molecules in the gas phase has been amply studied by several authors [1][2][3][4][5][6][7][8][9]. Pure CF3Br and mixtures with different gases have been also studied by MPD [10][11][12][13][14][15]. These studies reveal that the wavelength is the most relevant parameter to attain selectivity.…”

Section: Introductionmentioning

confidence: 99%

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

1998

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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.

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Isotope separation by multiphoton dissociation of molecules using high-power CO₂laser radiation. Scaling of the process for carbon isotopes

Cited by 30 publications

References 5 publications

Effect of NO on the Isotopically Selective Dissociation of CF₃Br with a Transversely Excited Atmospheric CO₂ Laser

Effect of NO on the Isotopically Selective Dissociation of CF₃Br with a Transversely Excited Atmospheric CO₂ Laser

Control strategies for laser separation of carbon isotopes

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

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Isotope separation by multiphoton dissociation of molecules using high-power CO2laser radiation. Scaling of the process for carbon isotopes

Cited by 30 publications

References 5 publications

Effect of NO on the Isotopically Selective Dissociation of CF3Br with a Transversely Excited Atmospheric CO2 Laser

Effect of NO on the Isotopically Selective Dissociation of CF3Br with a Transversely Excited Atmospheric CO2 Laser

Control strategies for laser separation of carbon isotopes

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

Contact Info

Product

Resources

About

Isotope separation by multiphoton dissociation of molecules using high-power CO₂laser radiation. Scaling of the process for carbon isotopes

Effect of NO on the Isotopically Selective Dissociation of CF₃Br with a Transversely Excited Atmospheric CO₂ Laser

Effect of NO on the Isotopically Selective Dissociation of CF₃Br with a Transversely Excited Atmospheric CO₂ Laser

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