کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
10652289 | 1002030 | 2005 | 11 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Analysis of extraterrestrial particles using monochromated electron energy-loss spectroscopy
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
دانش مواد (عمومی)
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
A monochromated (scanning) transmission electron microscope was used to analyze individual sub-micron grains within interplanetary dust particles (IDP). Using low-loss and core-loss electron energy-loss spectroscopy, we analyzed fluid and gas inclusions within vesiculated alumosilicate grains. It is shown that nanometer-sized vesicles contain predominantly molecular oxygen (O2) beside a small fraction of H2O. Low-loss spectra reveal the Schumann-Runge continuum peaking at 8.6Â eV and absorption bands reflecting vibrational excitation states of O2 molecules between the first (12.1Â eV) and second (16.1Â eV) ionization energy. The presence of oxygen gas is supported by the corresponding oxygen K-edge fine structure. The valence state of Fe in iron-oxide within the IDP was also studied. Low-loss spectra provide qualitative information about the oxidation state of iron consistent with the Fe2+/Fe3+ ratio quantitatively derived from the Fe L2,3 edge.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Micron - Volume 36, Issue 4, June 2005, Pages 369-379
Journal: Micron - Volume 36, Issue 4, June 2005, Pages 369-379
نویسندگان
Rolf Erni, Nigel D. Browning, Zu Rong Dai, John P. Bradley,