کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1240927 969151 2006 8 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Electron excitation coefficients of neutral and ionic levels of krypton in Townsend discharges
کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه شیمی شیمی آنالیزی یا شیمی تجزیه
پیش نمایش صفحه اول مقاله
Electron excitation coefficients of neutral and ionic levels of krypton in Townsend discharges
چکیده انگلیسی

In this paper, we present experimental results for excitation coefficients of krypton atoms to several Kr and Kr+ excited levels for E/N (electric field to gas particle number density ratio usually in units of Townsend, 1 Td = 10− 21 V m2) values from 7 × 10− 20 V m2 to above 1 × 10− 17 V m2. The data have been obtained in two different parallel plate self-sustained Townsend discharge drift tubes. The spatial distribution of the emission intensities were recorded and then normalized to give excitation coefficients at the anode, by using the electron flux at this point. The values of these coefficients are placed on an absolute scale by using a standard tungsten ribbon lamp calibrated against a primary blackbody radiation standard. The ionization rates at different E/N are obtained from the spatial emission profiles.The data for atomic krypton levels 2p2, 2p3, 2p5, 2p6, 2p7, 2p8, 3p5 and 3p6 (in Paschen notation) were converted to excitation coefficients by using quenching coefficients from the literature. The emission coefficients of eight 4s24p4 (3P)5p levels of Kr+ have also been measured for E/N values from about 1 × 10− 18 V m2 up to nearly 8 × 10− 18 V m2.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Spectrochimica Acta Part B: Atomic Spectroscopy - Volume 61, Issue 8, August 2006, Pages 951–958
نویسندگان
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