- Tytuł:
- Multi-Component EPR Spectra of Coals with Different Carbon Content
- Autorzy:
-
Pilawa, B.
Więckowski, A. B.
Pietrzak, R.
Wachowska, H. - Powiązania:
- https://bibliotekanauki.pl/articles/2043651.pdf
- Data publikacji:
- 2005-08
- Wydawca:
- Polska Akademia Nauk. Instytut Fizyki PAN
- Tematy:
-
61.66.Hq
76.30.Rn - Opis:
- EPR spectra of lignite"Mequinenza" (Spain) (62.3 wt% C) and Polish orthocoking coal (87.8 wt% C) were compared. The spectra were superpositions of broad Gaussian, broad Lorentzian 1, and narrow Lorentzian 3 lines. Concentration of paramagnetic centers - mainly delocalizedπ electrons - responsible for narrow Lorentzian 3 lines increases with increase in carbon content in coal. Coal units with slow and fast spin-lattice relaxation processes exist in the two studied samples. Slow spin-lattice interactions occur in simple aromatic coal units with broad Gaussian and Lorentzian 1 lines. Fast spin-lattice relaxation processes are characteristic of large aromatic units with narrow Lorentzian 3 lines.
- Źródło:
-
Acta Physica Polonica A; 2005, 108, 2; 403-407
0587-4246
1898-794X - Pojawia się w:
- Acta Physica Polonica A
- Dostawca treści:
- Biblioteka Nauki