Nuclear Magnetic Relaxation of Liquid He3 at Solid Surfaces |
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3.1 Cryostat 3.2 Sample Chamber 3.3 Gas Sample 90 degree pulse adsorbed aluminum powder aluminum sample atom boundary resistance CAPILLARY Carbolac carbon and aluminum carbon black carbon powder correlation function Cryostat Curie law dewar diffusion coefficient dilution refrigerator dip stick dipolar electronic correlation epoxy EXCHANGE GAS field dependence Figure flange free induction decay Gas Sample System gyromagnetic ratio H₁ H₂ He¹ He4 bath HEAT EXCHANGER heat treated impurity Larmor frequency lattice relaxation liquid He³ low temperature magnetic field magnetic susceptibility mixing chamber mold nmr coil nuclear magnetic relaxation nuclear relaxation nuclear spin nucleus oscillator oxygen paramagnetic sites pulse nmr Pulse Spectrometer pumped Pure He³ relaxation mechanism relaxation rates resistor rotating shown in Fig signal solid surfaces spin diffusion spin system spin-lattice relaxation spin-spin relaxation stainless steel static field Stycast T₁ T₂ tank circuit technique temperature dependence thermometer thesis ωο