图5. (a) pH 2.3时，NAA溶液经(1) OC、(2) OC′脉冲作用后的单重态NMR模拟谱图，以及它的(3)单脉冲¹H NMR模拟谱和(4)单脉冲¹H NMR实验谱；(b)利用OC′脉冲，将射频中心O1分别偏置(1) 10 Hz、(2) 5 Hz、(3) ?5 Hz、(4) ?10 Hz时得到的四组单重态NMR模拟谱图；(c) pH 5.5时，NAA溶液经OC′′脉冲作用后的(1)单重态模拟谱图以及(2)单脉冲¹H NMR模拟谱

Fig.5. (a) Simulated singlet state spectra of NAA solution with pH of 2.3 obtained by (1) OC pulse sequence, (2) OC$\mathrm{\text{'}}$ pulse sequence, and its (3) simulated and (4) experimental single pulse ¹H NMR spectra; (b) Four simulated singlet state spectra using OC$\mathrm{\text{'}}$ pulse sequence with offsetting the radio frequency center O1 of (1) 10 Hz, (2) 5 Hz, (3) ?5 Hz, (4) ?10 Hz, respectively; (c) Simulated (1) singlet state spectrum with OC′′ pulse and (2) single pulse ¹H NMR spectrum of NAA solution with pH of 5.5