Pulsed infrared carbon selective dissociation of CF3Br with N2 and D2 as buffers

Barrio, J.; Cézar, Raquel Fernández; G-Tablas, F.M.

doi:10.1016/s0009-2614(97)00358-8

Cited by 4 publications

(12 citation statements)

References 13 publications

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“…We have also studied the MPD of pure CF3Br and mixtures with monoatomic, diatomic and polyatomic gases [16][17][18]. Our results corroborate the effect of wavelength and pressure observed in previous studies, although most of these experiments have been carried out with static cells and sharp focusing, while ours and some others [19,20] have been performed with a long and narrow cell as a waveguide reactor, and constant fluence.…”

Section: Introductionsupporting

confidence: 87%

“…It seems that, with fluences between 0.94 and 1.7 J/ cm2, maximum possible enrichment is not achieved. The behaviour of the enrichment factor with fluence is similar for all the mixtures studied [18].…”

Section: Effect Of Other Variablesmentioning

confidence: 66%

“…The enrichment factor, /3, at different temperatures has been estimated for pure CF3Br [17], and mixtures [17,18]. In both cases it is observed that the enrichment improves when decreasing the temperature from 295-188 K for the most selective wavelengths, 1046.9 and 1048.7 cm-1, and remains practically unchanged for the other ones studied.…”

Section: Effect Of Other Variablesmentioning

confidence: 94%

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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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Section: Introductionsupporting

confidence: 87%

Section: Effect Of Other Variablesmentioning

confidence: 66%

Section: Effect Of Other Variablesmentioning

confidence: 94%

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

1998

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“…CF 3 Br is a well-suited target for investigation by IR laser chemistry and isotopically selective multiphoton-induced [8][9][10][11][12][13].…”

Section: Introductionmentioning

confidence: 99%

“…In the case of 13 CF 3 Br, the v 4 band was studied at high resolution, 0.006 cm −1 , by means of FTIR spectroscopy and cooling the sample cell to 200 K [40]. The vibrational energy, the B and ζ Coriolis constants of the v 4 = 1 state were derived for both 13 CF 3 79 Br and 13 CF 3 81 Br. The band contour simulation evidenced that the v 4 band is affected by the l = k = ±2 l-type resonance.…”

Section: Introductionmentioning

confidence: 99%

The ro-vibrational analysis of thev₄fundamental band of CF₃Br from jet-cooled diode laser and FTIR spectra in the 8.3-μm region

et al. 2014

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2014) The ro-vibrational analysis of the v 4 fundamental band of CF 3 Br from jetcooled diode laser and FTIR spectra in the 8.3-µm region,The v 4 fundamental band of CF 3 79 Br and CF 3 81 Br, present in natural isotopic abundance, was investigated in the 8.3-μm region by high-resolution infrared spectroscopic techniques. Tuneable diode laser spectra were recorded in the ranges 1202.5-1205.0 cm −1 , 1208.0-1210.1 cm −1 and 1212.5-1214.5 cm −1 . The tuneable diode laser spectra were obtained at the reduced temperature of 200 K and in a free-jet expansion. The latter technique was used to reduce spectral congestion, achieving a rotational temperature of about 50 K, with a resolution up to 0.0008 cm −1 . A Fourier transform infrared spectrum covering the entire spectral region of the v 4 band, between 1190 and 1220 cm −1 , was recorded at 298 K with a resolution of 0.004 cm −1 . The experimental wavenumbers from the different spectroscopic techniques were combined to accomplish the complete ro-vibrational analysis of v 4 . In total, 4651 transitions were assigned to CF 3 79 Br, 4047 to CF 3 81 Br, with J max = K max =80; of these, 3171 for CF 3 79 Br and 2755 for CF 3 81 Br are from diode laser measurements. The data of each isotopologue were analysed using the model Hamiltonian for a degenerate vibrational state of a molecule of C 3v symmetry. The v 4 band of both the isotopologues resulted essentially unperturbed, but the l = k = ±2 l-resonance was found to be active within the v 4 = 1 state. Precise values of the vibrational energy and of the ro-vibrational parameters of v 4 = 1 for CF 3 79 Br and CF 3 81 Br were obtained. The bromine isotopic splitting amounts to 6.9 × 10 −3 cm −1 . In addition, the equilibrium geometry and the harmonic force field were calculated ab initio using the large-size basis set def2-QZVP in conjunction to the PBE0 functional.

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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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Pulsed infrared carbon selective dissociation of CF3Br with N2 and D2 as buffers

Cited by 4 publications

References 13 publications

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

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

The ro-vibrational analysis of thev₄fundamental band of CF₃Br from jet-cooled diode laser and FTIR spectra in the 8.3-μm region

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

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Pulsed infrared carbon selective dissociation of CF3Br with N2 and D2 as buffers

Cited by 4 publications

References 13 publications

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

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

The ro-vibrational analysis of thev4fundamental band of CF3Br from jet-cooled diode laser and FTIR spectra in the 8.3-μm region

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

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Product

Resources

About

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

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

The ro-vibrational analysis of thev₄fundamental band of CF₃Br from jet-cooled diode laser and FTIR spectra in the 8.3-μm region

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