نوع مقاله : مقاله پژوهشی
نویسندگان
1 پژوهشکده فوتونیک و فن‌آوری‌های کوانتومی، پژوهشگاه علوم و فنون هسته‌ای، سازمان انرژی اتمی، صندوق پستی: 836-14395، تهران – ایران
2 گروه فیزیک، واحد تهران مرکزی، دانشگاه آزاد اسلامی، صندوق پستی: 69191-14696، تهران – ایران
چکیده
در این پژوهش، برای نخستین بار در کشور، جداسازی لیزری ایزوتوپ C13 از راه گسست چندفوتونی ایزوتوپ- گزین مولکول‌های گاز HCl2CF در مقیاس آزمایشگاهی به انجام رسید. برای این کار، تپ‌های یک لیزر 2TEA CO کوک‌پذیر که با یک برشگر پلاسمایی کوتاه‌سازی شده‌اند، با شاریدگی 2J/cm 50 درون اتاقک تابشدهی کانونی شدند. اتاقک تابشدهی نیز با فشار mbar 10-20 از گاز HCl2CF با نسبت‌های HCl: He2CF برابر 1:5 و 1:10 پر شده بود. نشان داده شد که فراوانی ایزوتوپ C13 در فرآورده‌ی گسست 4F2C با کاهش فشار گاز و شمار تپ‌های لیزری فرودی افزایش می‌یابد. در این آزمایش‌ها، بیشینه‌ی فراوانی ایزوتوپ C13 به‌دست آمده در آمیزه‌ی گازی با نسبت HCl: He2CF برابر 1:5 و فشار HCl2CF برابر mbar 10 به‌دست آمد که با 1500 تپ لیزری با شاریدگی 2J/cm 50 تابشدهی شده بودند.
کلیدواژه‌ها
عنوان مقاله [English]
Molecular laser isotope separation of 13C isotope by multi-photon dissociation of CF2HCl molecules with CO2 Laser
نویسندگان [English]
- S. Beheshtipour 1 2
- J. Karimi Sabet 1
- R. Neshati 1
- D. Esmaeilpour Ghoochani 1
- A. Abbasi 1
1 Photonics and Quantum Technologies Research School, Nuclear Science and Technology Research Institute, AEOI, P.O.Box: 14395-836, Tehran - Iran
2
چکیده [English]
In this work, laboratory-scale laser isotope separation of 13C by isotope-selective multi-photon dissociation of CF2HCl gas molecules has been done. To do this, the pulses of a tunable TEA CO2 laser, which have been shortened using a plasma shutter, were focused inside the irradiation cell with fluence in 50 J/cm2. The irradiation cell was filled with 10-20 mbar of CF2HCl gas with CF2HCl:He ratio of 1:5 and 1:10. It has been shown that the abundance of 13C in C2F4 product of dissociation increases with decreasing of the gas pressure and the number of the incident pulses. In these experiments, the highest abundance of 13C isotope was obtained with CF2HCl: He ratio of 1:5 and ten mbar pressure of CF2HCl gas, irradiated by 1500 pulses with 50 J/cm2 fluences.
کلیدواژه‌ها [English]
- Molecular laser isotope separation
- Plasma shutter
- Multi-photon dissociation
- CF2HCl
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