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用虚拟自旋—１／２算符理论考察了Ｉ＝１的核四极共振自旋系统在其能级间隔较小时对１—２个脉冲的响应．由于核四极相互作用表象中的射频场与核自旋的相互作用（Ｈｎ）包含时间．因而用Ｄｙｓｏｎ时序算符来计算密度算符在Ｈｎ作用下的演化．
Using the theory of virtual spin-1/2 operator, the response of 1-to-1 nuclear quadrupole resonant spin systems to 1-2 pulses at small energy levels is investigated. Due to the interaction between radio frequency field and nuclear spins in the representation of nuclear quadrupole interaction (Hn), time is involved. Thus the Dyson sequence operator is used to calculate the evolution of the density operator under the action of Hn.