Low-power electron paramagnetic resonance spin-echo spectroscopy |
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| Institution: | 1. Natural Resource Ecology Laboratory, Department 1499, Colorado State University, Fort Collins, CO 80523, United States;2. Northern Arizona University, School of Forestry, 200 East Pine Knoll Drive, P.O. Box 15018, Flagstaff, AZ 86011, United States;1. Centro de Física Aplicada y Tecnología Avanzada, Universidad Nacional Autónoma de México, Boulevard Juriquilla No. 3001, Querétaro, Querétaro CP 76230, Mexico.;2. Posgrado en Ciencia e Ingeniería de Materiales, Centro de Física Aplicada y Tecnología Avanzada, Universidad Nacional Autónoma de México, Boulevard Juriquilla No. 3001, Querétaro, Querétaro CP 76230, Mexico;3. Universidad Autónoma de Querétaro, Unidad de Microbiología Básica y Aplicada, Camino a Chichimequillas, Ejido Bolaños, Querétaro, Querétaro CP 76140, Mexico;4. Centro Conjunto de Investigación en Química Sustentable UAEM-UNAM, Carretera Toluca-Atlacomulco Km 14.5, Personal de la UNAM, Toluca, Estado de México 50200, Mexico;5. Instituto de Química, Universidad Nacional Autónoma de México, Ciudad Universitaria, Circuito Exterior s/n, Ciudad de México 04510, Mexico |
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| Abstract: | Electron spin-echo experiments generally require microwave power levels of hundreds of watts to produce the 5–10 G of RF field to generate 90° and 180° pulses in 10 ns. A low-power (i.e., less than I W) EPR spectrometer using a loop-gap resonator can generate the full range of time-domain experiments on samples with submicrosecond recovery times; 90° pulses are generated in 40 ns, and relaxation times as short as 22 ns are measured. Appropriate time-domain experiments were performed to independently measure the spinspin relaxation time, phase memory time, and spin-lattice relaxation time; the results were compared with CW saturation. It was found that the spin-spin and spin-lattice relaxation rates do differ by about 5%. The entire CW signal of PADS is reconstructed from a pulse experiment at a single field position. Small differences in linewidths among the three lines were seen in accordance with theory. |
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