کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5395930 | 1505738 | 2014 | 8 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Excitation and ionic fragmentation of the carvone molecule (C10H14O) around the O 1s edge
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
شیمی
شیمی تئوریک و عملی
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: Excitation and ionic fragmentation of the carvone molecule (C10H14O) around the O 1s edge Excitation and ionic fragmentation of the carvone molecule (C10H14O) around the O 1s edge](/preview/png/5395930.png)
چکیده انگلیسی
The electronic excitation and associated ionic dissociation of the carvone molecule have been studied around the oxygen 1s edge, using synchrotron radiation and time-of-flight techniques. Photoabsorption spectrum (total ion yield) and mass spectra have been obtained in the range between 520 and 545Â eV. For the sake of comparison, carvone mass spectra have also been obtained following valence (21.21Â eV) and core (carbon 1s) ionization. Fragmentation of the molecule is seen to be greatly enhanced following core excitation. Around the oxygen 1s edge, we observe an extensive fragmentation of the molecular skeleton, as exemplified by the appearance of several previously unreported ions: H+, H2+, CH+, CH2+ and CH3+, which are not formed at low energies. A maximum is observed at 536Â eV photon energy in the relative intensity of the oxygen-containing ions O+, O2+ and OH+, as an evidence for the existence of site-selective fragmentation of the carvone molecule excited around the O 1s edge. Absolute values for the photoionization and photodissociation cross sections were estimated using the molecular additive rule.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Electron Spectroscopy and Related Phenomena - Volume 192, January 2014, Pages 61-68
Journal: Journal of Electron Spectroscopy and Related Phenomena - Volume 192, January 2014, Pages 61-68
نویسندگان
R.B. de Castilho, C.V. Nunez, A.F. Lago, A.C.F. Santos, L.H. Coutinho, C.A. Lucas, S. Pilling, M.O. Silva-Moraes, G.G.B. de Souza,