摘要
A theory, coherent averaging theory under the condition of strong pulses of finitewidth, is advanced by combining perturbation method of quantum mechanics with coher-ent averaging theory. In dealing with sequences with pulses of finite width or windowlesspulse sequences, this method has the advantages of convenient computation, clear physicalmeaning, and accurate results. Especially in designing pulse sequences, it has certainguiding significance. This paper also discusses the applications of this method in variousexperiments, such as in Solid Echo, broadband composite pulses, WHH-4 and MREV-8. AWindowless Solid Echo pulse sequence, P_Y(ω_1, τ)P_? (ω_1 τ)P_X (90)°-τ', and a broadbandcomposite π pulse, P_X(90°)P_Y(90°)P_X(90°), are designed by this method. Experimentalresults show that the two-pulse sequences are quite effective.
A theory, coherent averaging theory under the condition of strong pulses of finitewidth, is advanced by combining perturbation method of quantum mechanics with coher-ent averaging theory. In dealing with sequences with pulses of finite width or windowlesspulse sequences, this method has the advantages of convenient computation, clear physicalmeaning, and accurate results. Especially in designing pulse sequences, it has certainguiding significance. This paper also discusses the applications of this method in variousexperiments, such as in Solid Echo, broadband composite pulses, WHH-4 and MREV-8. AWindowless Solid Echo pulse sequence, P<sub>Y</sub>（ω<sub>1</sub>, τ）P<sub>?</sub> （ω<sub>1</sub> τ）P<sub>X</sub> （90）°-τ’, and a broadbandcomposite π pulse, P<sub>X</sub>（90°）P<sub>Y</sub>（90°）P<sub>X</sub>（90°）, are designed by this method. Experimentalresults show that the two-pulse sequences are quite effective.
