| 摘要 |
PURPOSE:To obtain a sufficiently strong resonance signal even if a sample hard to measure with CP method, by irradiating repeatedly a 90 deg. pulse of a nucleus to be decoupled in a period except observing time of a FID signal. CONSTITUTION:High-frequency waves for observation and decoupling generated from oscillators 1, 2, are sent to an irradiation coil for boservation 7 and an irradiation coil for decoupling 8 arranged in a static magnetic field through gates 3, 4 and amplifiers 5, 6 and these are irradiated to a sample in a sample tube 9. Now, regarding an observation nucleus as <13>C and a nucleus to be decupled as <1>H, the frequency of the oscillator 1 is set to the resonance frequency of <13>C and the frequency of the oscillator 2 is set to the resonace frequency of <1>H. ON-OFF timing of the gates 3, 4 is controlled by a controlling circuit 10. A signal is enlarged by a NOE when the observation is started after irradiating a 90 deg. pulse of the <1>H nucleus to be decoupled to the sample repeatedly previous to the irradiation of a high frequency pulse for the obsevation and making into a staturated state and then, a strong resonance line can be obtained. |
