Department of Chemistry, New York University, New York, New York 10003, USA.
J Chem Phys. 2011 Jun 21;134(23):234504. doi: 10.1063/1.3600758.
The theoretical basis of two-frequency saturation is given here in the framework of Provotorov theory. The parameters influencing the saturation efficiency are discussed and studied experimentally using a liquid-crystalline test system. It is shown that double-frequency irradiation can be extremely efficient when the irradiation frequencies are placed at opposite sides of the characteristic frequency of the spin system, and that the frequency separation in the double-frequency irradiation can be varied over a large range. Provotorov theory is also shown to provide good insights into the experimental findings, which would otherwise be difficult to obtain from simulations.
本文在普罗托罗夫理论的框架下给出了双频饱和的理论基础。利用液晶测试系统，通过实验讨论和研究了影响饱和效率的参数。结果表明，当辐照频率位于自旋系统特征频率的相反两侧时，双频辐照可以非常有效，并且双频辐照中的频率间隔可以在很大范围内变化。普罗托罗夫理论还很好地解释了实验结果，否则从模拟中很难获得这些结果。
