Macroscopic Isotope Separation of <sup>13</sup>C by a CO<sub>2</sub> Laser

Fuß, Werner; Göthel, J.; Ivanenko, Mikhail; Schmid, W. E.; Hering, P.; Kompa, K. L.; Witte, Klaus

doi:10.1080/00211919408046733

Cited by 19 publications

(39 citation statements)

References 9 publications

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“…The mass spectrum shows pronounced intensity variations. It is, for example, observed that Zr 15 O 29 is a cluster that is always more intense than neighboring peaks. This could have to do with either a high stability of the corresponding neutral cluster and/or a low ionization potential.…”

Section: Metal Oxidesmentioning

confidence: 99%

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Resonant Ionization Using IR Light: A New Tool To Study the Spectroscopy and Dynamics of Gas-Phase Molecules and Clusters

2003

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Resonant IR excitation of gas-phase molecules and clusters can lead to superhot species that thermally emit an electron. Monitoring the mass selected ion yield as a function of IR laser frequency yields the IR-REMPI (infrared resonance enhanced multiphoton ionization) spectrum of the molecule or cluster. Although this IR-REMPI spectrum is not the same as the linear absorption spectrum, it can be quite similar and it yields valuable information on the IR optical properties of the species investigated. In this article, the method and the necessary tools are presented. Results from experiments on fullerenes, metal carbide, metal oxide, and metal nitride clusters are shown.

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Section: Metal Oxidesmentioning

confidence: 99%

“…14 In another study, large amounts of 13 C were obtained in a CO 2 laser isotope separation process. 15 The mechanisms of IR-MPE and IR-MPD were also theoretically investigated. 13,[16][17][18][19] Models assume that the IR photons are absorbed resonantly by bright states.…”

Section: Introductionmentioning

confidence: 99%

Resonant Ionization Using IR Light: A New Tool To Study the Spectroscopy and Dynamics of Gas-Phase Molecules and Clusters

2003

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“…It is quite possible to increase the productivity by optimization of experimental factors and by improvement of laser power or repetition rate. On the other hand we produced 0.014 mole SiF 4 /h (atomic fraction of 30 Si, 33%), where the laser was tuned to the 10P (12) diation of Si 2 F 6 with 10P(8) laser pulses causes the IRMPD of 28,28 Si 2 F 6 to some extent, although the amount of the decomposition per pulse is less than those of Si 2 F 6 molecules containing 29 Si and 30 Si.…”

Section: Application Of Silicon Isotopesmentioning

confidence: 99%

“…1,2) Since early observations on isotope effects by Letokhov et al, many efforts have been made for the application of IRMPD to practical isotope separation. [3][4][5][6][7][8][9][10][11][12][13][14][15] Most studies are concerned with 13 C separation by IRMPD of fluorohydrocarbons. Baranov has reported the production of enriched 12 C (atomic fraction, 99.99%; production rate, 1 g/h) by IRMPD of natural CF 3 I using a high repetition CO 2 laser.…”

Section: Introductionmentioning

confidence: 99%

“…4) Fuss and his coworkers have reported the production of enriched 13 C (atomic purity, 50%; production rate, 65 mg/h) by IRMPD of CHClF 2 using a Q-switched cw CO 2 laser. [11][12][13] Naturally occurring silicon consists of three stable isotopes: 92.23% of 28 Si, 4.67% of 29 Si, and 3.10% of 30 Si. Arai and his coworkers have demonstrated that the IRMPD of Si 2 F 6 is highly selective on silicon isotopes in the TEA CO 2 laser irradiation with laser pulses in the vicinity of 950 cm −1 .…”

Section: Introductionmentioning

confidence: 99%

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High Enrichment of²⁸Si by Infrared Multiple Photon Decomposition of Si₂F₆

Yokoyama

Ohba

Shibata

et al. 2002

Journal of Nuclear Science and Technology

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High enrichment of 28 Si has been carried out using the laser isotope separation technique based on the isotopically selective infrared multiple photon decomposition of Si 2 F 6 . When about 2 Torr of Si 2 F 6 was irradiated at a fluence of 1.0 J/cm 2 per pulse with the 10P(8) line of a TEA CO 2 laser at 954.55 cm −1 , the compound decomposed very efficiently with high isotope selectivity. The products SiF 4 and white solids were enriched with 29 Si and 30 Si, while the residual Si 2 F 6 was enriched with 28 Si. The atomic fraction of 28 Si in residual Si 2 F 6 increased with increasing decomposition of Si 2 F 6 ; 99.9% of 28 Si was obtained at a consumption of 50% of initial Si 2 F 6 . The large-scale flow experiment yielded 99.7% 28 Si at a production rate of 2.5 g/h, where a mixture of 3.3 Torr Si 2 F 6 and 6.6 Torr argon was irradiated with 10P(8) laser pulses at a repetition rate of 5 Hz. Merits and demerits of the present laser separation are discussed in comparison to those of conventional separation methods. Laser enrichment of 28 Si seems promising for economical production of large quantity of pure 28 Si. Various applications of silicon isotopes are briefly reviewed.

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Mass and Isotope‐Selective Infrared Spectroscopy

Hippler¹,

Miloglyadov²,

Qüack³

et al. 2011

Handbook of High‐resolution Spectroscopy

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Recent advances in laser spectroscopic techniques make it possible to obtain mass‐ and isotope‐selective infrared spectra of gas‐phase species at high resolution and reduced hot‐band spectral congestion. In these techniques, infrared excitation is coupled with ultraviolet multiphoton ionization and detection of the resulting ions in a mass spectrometer, which allows the separation of contributions of different isotopomers and, more generally, species of different mass in a mixture. In combination with jet cooling techniques, spectra are obtained for very cold molecules. These spectra can then be analyzed to extract information on dynamical processes such as intramolecular vibrational redistribution or tunneling and rearrangement processes, and on how intramolecular dynamics is influenced by vibrational excitation and isotope effects. In this review, we introduce isotope‐selective infrared spectroscopic techniques and present some selected applications on isotope effects and intramolecular dynamics of vibrationally excited chloroform, aniline, and benzene obtained by isotope‐selective infrared spectroscopy.

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Macroscopic Isotope Separation of ¹³C by a CO₂ Laser

Cited by 19 publications

References 9 publications

Resonant Ionization Using IR Light: A New Tool To Study the Spectroscopy and Dynamics of Gas-Phase Molecules and Clusters

Resonant Ionization Using IR Light: A New Tool To Study the Spectroscopy and Dynamics of Gas-Phase Molecules and Clusters

High Enrichment of²⁸Si by Infrared Multiple Photon Decomposition of Si₂F₆

Mass and Isotope‐Selective Infrared Spectroscopy

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Macroscopic Isotope Separation of 13C by a CO2 Laser

Cited by 19 publications

References 9 publications

Resonant Ionization Using IR Light: A New Tool To Study the Spectroscopy and Dynamics of Gas-Phase Molecules and Clusters

Resonant Ionization Using IR Light: A New Tool To Study the Spectroscopy and Dynamics of Gas-Phase Molecules and Clusters

High Enrichment of28Si by Infrared Multiple Photon Decomposition of Si2F6

Mass and Isotope‐Selective Infrared Spectroscopy

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Macroscopic Isotope Separation of ¹³C by a CO₂ Laser

High Enrichment of²⁸Si by Infrared Multiple Photon Decomposition of Si₂F₆