Continuous wave multi-quantum electron paramagnetic resonance spectroscopy

Journal of Chemical Physics - Tập 93 Số 6 - Trang 3891-3898 - 1990
P. B. Sczaniecki1, James S. Hyde1, Wojciech Froncisz2
1National Biomedical ESR Center, Department of Radiology, Medical College of Wisconsin, Milwaukee, Wisconsin 53226
2Department of Biophysics, Institute of Molecular Biology, Jagiellonian University, Krakow Poland

Tóm tắt

The equation of Anderson [Phys. Rev. 102, 151 (1956)] (ω2−ω1)2=(γH0−ω1)2+γ2H21, which describes resonance conditions if relaxation times are long and irradiation at two frequencies is applied to a spin system, has been studied experimentally in the context of continuous wave electron paramagnetic resonance (EPR) spectroscopy. Here ω2 and ω1 are the frequencies of two incident microwave levels, one of which is much stronger than the other and is of amplitude H1. γH0 is the resonant condition if just one frequency is applied. Magnetization at either ω1 or ω2 has been observed as a function of sweep of the static magnetic field, sweep of ω2 and also sweep of the amplitude H1. Observation of magnetization at frequency ω1 corresponding to the strong microwave field H1 replicates the rotary saturation experiment of Redfield [Phys. Rev. 98, 1787 (1955)]. Multi-quantum effects are studied with the two frequencies well separated and also when they lie within the width of a single homogeneous line. In addition, data are shown when both microwave amplitudes are similar and the Anderson equation is no longer correct. The thrust of the work is not only to study the spin physics, but also to develop a basis for our development of rotary resonance as an alternative to field modulation in EPR spectroscopy [J. Chem. Soc. Faraday Trans. 1 85, 3901 (1989)].

Từ khóa


Tài liệu tham khảo

1989, J. Chem. Soc. Faraday Trans. 1, 85, 3901, 10.1039/f19898503901

1956, Phys. Rev., 102, 151, 10.1103/PhysRev.102.151

1956, Phys. Rev., 102, 104, 10.1103/PhysRev.102.104

1964, J. Chem. Phys., 40, 459, 10.1063/1.1725137

1970, J. Chem. Phys., 52, 4041, 10.1063/1.1673606

1970, J. Chem. Phys., 53, 4524, 10.1063/1.1673983

1983, J. Chem. Phys., 78, 5293, 10.1063/1.445483

1955, Phys. Rev., 98, 1787, 10.1103/PhysRev.98.1787

1990, J. Magn. Reson., 86, 82

1975, Phys. Rev. B, 12, 847, 10.1103/PhysRevB.12.847

1975, Solid State Commun., 17, 211, 10.1016/0038-1098(75)90044-7

1977, Phys. Rev. B, 16, 164, 10.1103/PhysRevB.16.164

1977, Phys. Status Solidi, 84, 305, 10.1002/pssb.2220840132

1978, J. Phys. C, 11, L893, 10.1088/0022-3719/11/22/003

1979, J. Magn. Reson., 33, 1

1985, J. Magn. Reson., 64, 47

1972, Lett. Nuovo Cimento, 5, 197, 10.1007/BF02815925

1982, J. Magn. Reson., 47, 515

1976, J. Magn. Reson., 23, 249

Thông tin
Thông tin xuất bản

Journal of Chemical Physics

Tập 93 Số 6

3891-3898

Thông tin tác giả