摘要: The electron nuclear double resonance spectrum of both isotopes 151 Eu and 163 has been measured in a single crystal calcium fluoride containing about 0.01 % 2+ . As the lines were narrow ( ~ 10kc/s) hyperfine structure parameter g-value to high precision giving following values: A = -102.9069±0.0013 Mc/s, 153 -45.6730±0.0025 Mc/s B -0.7855±0.0052 -2.0294 ±0.0068 gI - 7.4969±0.0020 (x 10 -4 )β, 3.3125±0.0030 )β. In order fit line positions spin Hamiltonian which is usually assumed for system it was necessary add small higher-order terms. results these measurements are compared with precise atomic beam measurement on Eu.
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