Multiple quantum correlated spectroscopy revamped by asymmetric z-gradient echo detection signal intensity as a function of the read pulse flip angle as verified by heteronuclear 1H/31P experiments.
Heteronuclear multiple quantum (n=+/-0 and n=+/-2) correlated spectroscopy revamped by asymmetric z-gradient echo detection (CRAZED) experiments were performed on the spins 31P and 1H in a H3PO4 solution in order to determine the optimum flip angle for the read pulse. It has been shown that for the negative quantum signals, the maximum signals appear at beta=0, and for the positive quantum signals, the maximum signals appear at beta=pi. The CRAZED signals were compared to the single quantum signals in two-pulse two-gradient experiments. It is found that the CRAZED signals can also be distinguished into gradient echoes and spin echoes. The gradient-echo-type CRAZED signal requires beta=0 and the spin-echo-type CRAZED signal requires beta=pi for maximum echo intensities, in the same way as in single quantum experiments.
Jiang
Bin
B
State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Wuhan Institute of Physics and Mathematics, The Chinese Academy of Sciences, Wuhan 430071, China and Graduate School of the Chinese Academy of Sciences, Beijing 100049, China.
Liu
Huili
H
Liu
Maili
M
Ye
Chaohui
C
Mao
Xi-an
XA
D017666:Deuterium Oxide / Q000737:chemistry; D006859:Hydrogen / Q000737:chemistry*; D008433:Mathematics; D019906:Nuclear Magnetic Resonance, Biomolecular / Q000379:methods*; D010756:Phosphoric Acids / Q000737:chemistry; D010758:Phosphorus / Q000737:chemistry*; D012815:Signal Processing, Computer-Assisted; D014867:Water / Q000737:chemistry
D010756:Phosphoric Acids; D014867:Water; D010758:Phosphorus; D006859:Hydrogen; C030242:phosphoric acid; D017666:Deuterium Oxide