کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1240197 | 969110 | 2011 | 7 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Determination of dissociation temperature for ArO+ in inductively coupled plasma-mass spectrometry: Effects of excited electronic states and dissociation pathways
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
شیمی
شیمی آنالیزی یا شیمی تجزیه
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چکیده انگلیسی
The method of comparing experimental and calculated ion ratios to determine a gas kinetic temperature (Tgas) characteristic of the origin of a polyatomic ion in inductively coupled plasma-mass spectrometry (ICP-MS) is applied to ArO+. Repeated measurements of ion ratios involving this species yield erratic Tgas values. Complications arise from the predicted presence of a low-lying excited electronic state (2Π) above the 4Σ ground state. Omission of this excited state yields unreasonably high temperatures (> 10,000 K) for nine out of nineteen trials. Inclusion of the excited electronic state in the partition function of ArO+ causes temperatures to increase further. The problem appears to be related to the prediction that ArO+ in the 2Πexcited state dissociates into Ar+ and O, different products than ArO+ 4Σ which dissociates into Ar and O+. Adjustments to the calculations to account for these different products yield reasonable temperatures (2100 to 3500 K) that are consistent from day-to-day and similar to those seen for other weakly-bound polyatomic ions.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Spectrochimica Acta Part B: Atomic Spectroscopy - Volume 66, Issue 8, August 2011, Pages 581-587
Journal: Spectrochimica Acta Part B: Atomic Spectroscopy - Volume 66, Issue 8, August 2011, Pages 581-587
نویسندگان
Sally M. McIntyre, Jill Wisnewski Ferguson, R.S. Houk,