| 单词 | spin echo |
| 释义 | > as lemmasspin echo spin echo n. Physics a radio-frequency signal induced in a coil surrounding a system of (esp. nuclear) spins in a static magnetic field in the plane of the coil following the application of two radio-frequency pulses to the coil; frequently attributive. ΘΚΠ the world > matter > physics > atomic nucleus > [noun] > field of energy > induced radio signal spin echo1949 1949 Bull. Amer. Physical Soc. 24 vii. 13/2 Spin Echoes. E. L. Hahn, University of Illinois. 1963 Times 8 May 2/7 (advt.) Post-Doctoral Research Fellowship..for work on relaxation time measurements by spin-echo techniques. 1979 Nature 22 Nov. 367/1 Experiments using the weakly inelastic scattering of neutrons have also become feasible; they give similar information [about the motion of polymer chains in a liquid], but for higher frequencies: from 1011s−1 with ‘back scattering spectrometers’ down to 2 × 108s−1 with the most recent ‘spin echo’ method. < as lemmas |
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