کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1240531 | 969127 | 2010 | 5 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Cavity Ring-Down Spectroscopy coupled with helium microwave-induced plasma for fluorine detection
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
شیمی
شیمی آنالیزی یا شیمی تجزیه
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چکیده انگلیسی
Cavity Ring-Down Spectroscopy with a tunable diode laser has been used for the detection of fluorine at trace levels. A homemade experimental setup was constructed to accommodate the microwave-induced plasma glow discharge inside the optical cavity. The energy delivered by helium plasma discharge was successfully used not only for the dissociation of fluorine molecules but, more importantly, also for the excitation of fluorine atoms into their metastable level 3s4P5/2. The absorption observed at the 3s4P5/2-3p4Do7/2 transition (corresponding to a 685.603-nm atomic line) was used for fluorine atom detection. Good agreement between theoretical and measured absorption line shapes confirmed the selectivity of fluorine atomic absorption. We observed an absorption coefficient of 4 â 10â6 cmâ1, corresponding to a detection of F(3s4P5/2) atoms at about 1.5 â 106 atoms cmâ3. These data demonstrate that we achieved a detection limit of 100 ng gâ1 under the conditions of our initial homemade experimental setup. However, the optimization of the system may lead to the improvement of the detection limit by approximately two orders of magnitude.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Spectrochimica Acta Part B: Atomic Spectroscopy - Volume 65, Issue 4, April 2010, Pages 306-310
Journal: Spectrochimica Acta Part B: Atomic Spectroscopy - Volume 65, Issue 4, April 2010, Pages 306-310
نویسندگان
T. Stacewicz, E. Bulska, A. RuszczyÅska,