کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5424573 | 1395829 | 2009 | 7 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Frozen methanol bombarded by energetic particles: Relevance to solid state astrochemistry
دانلود مقاله + سفارش ترجمه
دانلود مقاله ISI انگلیسی
رایگان برای ایرانیان
موضوعات مرتبط
مهندسی و علوم پایه
شیمی
شیمی تئوریک و عملی
پیش نمایش صفحه اول مقاله

چکیده انگلیسی
Methanol is an important precursor of many complex prebiotic species and is found abundantly, in solid phase, in several astrophysical environments, such as comets and protostars. These environments are, in general, subjected to some form of ionizing particles as cosmic rays, solar wind particles and/or photons. To simulate physico chemical effects of cosmic rays on methanol and to investigate in particular its fragmentation and cluster emission from the solid phase, condensed methanol at 55Â K was bombarded with â¼65Â MeV heavy ions constituted by 252Cf fission fragments. Mass spectra of positive desorbed ions were obtained using a time-of-flight Plasma Desorption Mass Spectrometry (PDMS-TOF), giving information on the fragmentation pattern and abundance of the ionic species released from the frozen sample surface. Since CH3OH2+ and CH3O+ are the most abundant species detected, the hydrogenation and de-hydrogenation of methanol result to be the predominant ionic processes in the methanol surface. Furthermore, the hydrogenation yields emission of the (CH3OH)nCH3OH2+ cluster series, while the CH3O+ species does not attach to methanol molecules. The production of other cluster ion series, some of them with mass/charge up to 300Â u/e was also analyzed by PDMS.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Surface Science - Volume 603, Issue 9, 1 May 2009, Pages 1190-1196
Journal: Surface Science - Volume 603, Issue 9, 1 May 2009, Pages 1190-1196
نویسندگان
D.P.P. Andrade, H.M. Boechat-Roberty, R. Martinez, M.G.P. Homem, E.F. da Silveira, M.L.M. Rocco,