Title :
Millimeter magnetic spectroscopy of paramagnetic complexes Cr(V)
Author :
Belyaev, A. ; Vorobyova, N. ; Dzyubak, A. ; Ivanchenko, I. ; Karelin, S. ; Karnauhov, I. ; Lukhanin, A. ; Orlov, V. ; Popenko, N.
Author_Institution :
Inst. of Radiophys. & Electron., Acad. of Sci., Kharkov, Ukraine
Abstract :
The obtained results of the complex spectroscopic studies of static and dynamic characteristics of the EHBA(CrV) and HMBA(CrV) complexes diluted in propanediol show that the maximum polarization is achieved for the paramagnetic center concentration N=0.6×1020 - 1.2×1020 cm -3. It has been determined that the "dynamic cooling with the burnt out hole" is the dominating mechanism of dynamic nuclear polarisation (DNP) for both complexes. However, in contrast to the HMBA(CrV) complex the effective diffusion of nuclear spin temperature is the distinctive feature of the nuclear spin kinetics in the EHBA(CrV) complex caused by a different chemical structure of the used organic acid
Keywords :
EPR line breadth; chromium compounds; dynamic nuclear polarisation; millimetre wave spectra; organic compounds; Cr(V) paramagnetic complexes; DNP; EHBA(CrV) complexes; HMBA(CrV) complexes; burnt out hole dynamic cooling; chemical structure; dynamic characteristics; dynamic nuclear polarisation; maximum polarization; millimeter magnetic spectroscopy; nuclear spin kinetics; nuclear spin temperature effective diffusion; organic acid; paramagnetic center concentration; propanediol; static characteristics; Chaos; Cooling; Electrons; Frequency; Magnetic resonance; Paramagnetic materials; Paramagnetic resonance; Polarization; Shape; Spectroscopy;
Conference_Titel :
Physics and Engineering of Millimeter and Sub-Millimeter Waves, 2001. The Fourth International Kharkov Symposium on
Conference_Location :
Kharkov
Print_ISBN :
0-7803-6473-2
DOI :
10.1109/MSMW.2001.947325
