Yield and enrichment studies of C-13 isotope by multi-photon dissociation of Freon-22 at low temperatures

Journal of Chemical Sciences

Chintan Gupta¹  A K Nath¹  Manoj Kumar1¹  Anant Deshpande² 

[1] Centre for Advanced Technology, Indore 452 013, India$$;Devi Ahilya Vishwavidyalaya, Indore 452 001, India$$

关键词: TEA CO2 laser;    carbon-13;    isotope separation;    low temperature.;   

DOI  :  

来源: Indian Academy of Sciences

【 摘 要 】

Multi-photon dissociation of Freon-22 (CF2HCl) at low temperatures has been carried out to separate the C-13 isotope using a TEA CO2 laser. Yield and enrichment of C-13 isotope in the product C2F4 are studied at 9𝑃(22) laser line as a function of temperature (-50°C to 30°C). It is observed that at a given fluence when the temperature is lowered the yield decreases and the enrichment factor of C-13 increases.Room temperature irradiation of CF2HCl towards the blue edge of C-13 absorption (i.e. at 9𝑃(20) laser line) gives low yield of the product (C2F4) at a fluence, which produces the desired enrichment factor of 100. An increase in fluence gives very high yield of C2F4 but the enrichment factor is very low. Irradiating CF2HCl at a temperature of -10°C enhances the enrichment factor to 100 and the yield obtained is comparable to that towards the red edge of C-13 absorption (i.e. at 9𝑃(26) laser line).At a given enrichment factor higher enrichment efficiency is achieved when CF2HCl is irradiated at lower temperature.

【 授权许可】

Unknown