29Si and 30Si enrichment by IR MPD of Si2F6

Kamioka, M.; Arai, Shigeyoshi; Ishikawa, Yoichi; Isomura, Shohei; Takamiya, Nobuo

doi:10.1016/0009-2614(85)80432-2

Cited by 34 publications

(21 citation statements)

References 6 publications

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“…The 10P(8) laser line has been shown to give the highest selectivity in the enrichment of 28 Si. 16,17) The purity of 28 Si increases with increasing decomposition of Si 2 F 6 and reaches 99.9% at a consumption of 50%. Therefore, the irrativity in the IRMPD of Si 2 F 6 .…”

Section: Laser Isotope Separationmentioning

confidence: 98%

“…The shifts must be responsible for the isotopic selechave demonstrated that the irradiation of natural Si 2 F 6 with the 10P(12) line at 951.19 cm −1 gives the highest selectivity of 30 Si. 16,17) When 2 Torr of Si 2 F 6 was irradiated with pulses at a fluence of 0.25 J/cm 2 per pulse, the SiF 4 produced was found to contain 46% of 28 Si, 8% of 29 Si, and 46% of 30 Si. Since the enrichment of 30 Si is mainly caused by the selective IRMPD of 28,30 Si 2 F 6 , it is almost impossible to obtain 30 Si with isotopic purities higher than 50%.…”

Section: Laser Isotope Separationmentioning

confidence: 98%

“…Of these compounds examined, hexafluorodisilane has been found to undergo highly selective IRMPD in the irradiation with laser pulses at wavenumbers around 950 cm −1 . [16][17][18][19][20] Figure 2 presents an infrared absorption spectrum observed for natural Si 2 F 6 and intensities of 10P and 10R lines of a CO 2 TEA laser. The band with the peak at 990 cm −1 is certainly ascribed to the 28 SiF 3 anti-symmetric stretching vibration mode of 28,28 Si 2 F 6 .…”

Section: Laser Isotope Separationmentioning

confidence: 99%

“…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 . [16][17][18][19][20] In addition to high isotopic selectivity, the decomposition occurs very efficiently at low fluences below 1.0 J·cm −2 per pulse. The efficient decomposition enables us to produce relatively large amounts of silicon isotopes using a commercially available high power TEA CO 2 laser.…”

Section: Introductionmentioning

confidence: 98%

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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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Section: Laser Isotope Separationmentioning

confidence: 98%

Section: Laser Isotope Separationmentioning

confidence: 98%

Section: Laser Isotope Separationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 98%

See 2 more Smart Citations

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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“…Therefore, although some caution is required in the analysis of IRMPD spectra, these spectral signatures may also be used to obtain an estimate of the anharmonic parameters. 36 Since the 1970s, there has been considerable interest in IRMPD spectroscopy to induce isotopically selective dissociation, 34,37,38 which could enable isotope enrichment. In order to overcome the typical dissociation thresholds of several eV, the absorption of many (tens to hundreds of) infrared photons is necessary, requiring a powerful laser source, such as a gas discharge laser.…”

Section: Introductionmentioning

confidence: 99%

Free electron laser-Fourier transform ion cyclotron resonance mass spectrometry facility for obtaining infrared multiphoton dissociation spectra of gaseous ions

Valle

Eyler

Oomens

et al. 2005

Review of Scientific Instruments

297

239

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A Fourier transform ion cyclotron resonance (FT-ICR) mass spectrometer has been installed at a free electron laser (FEL) facility to obtain infrared absorption spectra of gas phase ions by infrared multiple photon dissociation (IRMPD). The FEL provides continuously tunable infrared radiation over a broad range of the infrared spectrum, and the FT-ICR mass spectrometer, utilizing a 4.7 Tesla superconducting magnet, permits facile formation, isolation, trapping, and high-mass resolution detection of a wide range of ion classes. A description of the instrumentation and experimental parameters for these experiments is presented along with preliminary IRMPD spectra of the singly-charged chromium-bound dimer of diethyl ether ͑Cr͑C 4 H 10 O͒ 2 + ͒ and the fluorene molecular ion ͑C 13 H 10 + ͒. Also presented is a brief comparison of the fluorene cation spectrum obtained by the FT-ICR-FEL with an earlier spectrum recorded using a quadrupole ion trap (QIT).

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