The Application of Simple and Easy to Implement Decoupling Pulse Scheme Combinations to Effect Decoupling of Large 𝐽 Values with Reduced Artifacts

Figure 12

The ³¹P NMR spectrum of HP(=O)(OCH₂CH₃)₂ indicates the resultant sidebands with decoupling of ¹H by (a) MPF and CW decoupling (PW, 1 ms; PL, 15.8 dB; 𝜈_1/2, 1.50 Hz; DB, 120 Hz; SDB, irrelevant); (b) MPF decoupling (PW, 1 ms; PL, 11.3 dB; 𝜈_1/2, 1.32 Hz; DB, 28 kHz; SDB, 7 kHz); (c) APD decoupling using CHIRP and CW (PW, 1 ms; PL, 15.2 dB; 𝜈_1/2, 1.48 Hz; DB, 250 Hz; SDB, irrelevant); (d) APD using CHIRP (PW, 1 ms; PL, 5.8 dB; 𝜈_1/2, 1.47 Hz; DB, 44 kHz; SDB, 15 kHz); (e) CPD decoupling using GARP and CW (PW, 60 μs; PL, 10.6 dB; 𝜈_1/2, 1.41 Hz; DB, 1 kHz; SDB, 400 Hz); and (f) CPD decoupling using GARP (PW, 60 μs; PL, 9.4 dB; 𝜈_1/2, 1.35 Hz; DB, 19 kHz; SDB, 7 kHz). Note: spectra (b) and (d) have been shifted in frequency slightly for ease of comparison.