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In a method for exciting transverse magnetization by irradiating a nuclear spin system subjected to a const. magnetic field with a frequency-modulated RF-pulse (chirp-pulse) and with a further frequency-modulated RF-pulse (further chirp-pulse) for refocusing the magnetization, the RF-pulse and the further RF-pulse overlap each other in time at least partially. Thus, the duration of the pulses can be reduced. [on SciFinder (R)]