Enrichment of Silicon Isotopes with Infrared Free-Electron Laser Radiation

Autor:	John L. Lyman, Tetsuji Noda, Brian E. Newnam, Hiroshi Suzuki
Rok vydání:	1999
Předmět:	Silicon Infrared Chemistry Analytical chemistry Free-electron laser chemistry.chemical_element Laser law.invention Isotope separation law Spectral width Isotopes of silicon Irradiation Physical and Theoretical Chemistry
Zdroj:	The Journal of Physical Chemistry A. 103:4227-4232
ISSN:	1520-5215 1089-5639
DOI:	10.1021/jp984699v
Popis:	We have used the FELIX infrared free-electron laser (FEL) at the FOM Institute for Plasma Physics in The Netherlands to enrich silicon isotopes by multiple-photon dissociation of the molecule Si2F6. The absorption of infrared radiation induces the reaction Si2F6 → SiF4 + SiF2. Much of the SiF2 product further reacts to form additional SiF4. The Si2F6 molecule has absorption bands in the 10, 12, and 25 μm spectral regions. FEL-induced reactions occurred in all three regions. The reaction fraction was highest for the stronger band in the 10 μm region. Reactions in all three bands were isotopically selective. Irradiation in the 10 μm region at 952 cm-1 gave an isotopic selectivity of 5.6 for 30Si. For comparison, the published isotopic selectivity using a CO2 laser in the same spectral region is in excess of 17. We attribute the lower selectivity obtained with an FEL to its longer macropulse, its broader spectral width, and differences in experimental procedure. FEL irradiation in the region of the 12 μm ban...
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::1e0268ac8f6a0319dd6fde11e8f8db85 https://doi.org/10.1021/jp984699v Zobrazit plný text záznamu