| 摘要 |
Cycling sidebands arising from broadband decoupling of I-S heteronuclei are separated from the decoupled I spectra investigated in a 2D pulse sequence wherein I excitation 50 is followed after the interval delta+t1 with refocusing pi pulse 54 operating on the I spins. After I excitation 50, the JIS coupling is inverted by pi pulse 52 and immediately following the pi pulse 54, decoupling 56 is turned on and maintained while signal acquisition in the interval t2 is initiated at delta+t1 after pulse 54. Double FT yields a 2D spectrum with sidebands completely displaced to diagonal locii, or alternatively the time domain data may be accumulated into respective t2 locations by effectively summing over t1 to yield a single dimensional spectrum free of cycling sidebands.
|
