在对氮氧化物自旋探针进行微波辐照后的磁共振力显微镜实验中观察到的长寿命频移。
Long-lived frequency shifts observed in a magnetic resonance force microscope experiment following microwave irradiation of a nitroxide spin probe.
作者信息
Chen Lei, Longenecker Jonilyn G, Moore Eric W, Marohn John A
机构信息
Department of Chemistry and Chemical Biology, Cornell University, Ithaca, New York 14853-1301, USA.
出版信息
Appl Phys Lett. 2013 Apr 1;102(13):132404. doi: 10.1063/1.4795018. Epub 2013 Apr 2.
We introduce a spin-modulation protocol for force-gradient detection of magnetic resonance that enables the real-time readout of longitudinal magnetization in an electron spin resonance experiment involving fast-relaxing spins. We applied this method to observe a prompt change in longitudinal magnetization following the microwave irradiation of a nitroxide-doped perdeuterated polystyrene film having an electron spin-lattice relaxation time of [Formula: see text]. The protocol allowed us to discover a large, long-lived cantilever frequency shift. Based on its magnitude, lifetime, and field dependence, we tentatively attribute this persistent signal to deuteron spin magnetization created via transfer of polarization from nitroxide spins.
我们引入了一种用于磁共振力梯度检测的自旋调制协议，该协议能够在涉及快速弛豫自旋的电子自旋共振实验中实时读出纵向磁化强度。我们将此方法应用于观察在微波辐照具有[公式：见原文]电子自旋 - 晶格弛豫时间的氮氧化物掺杂的全氘代聚苯乙烯薄膜后纵向磁化强度的即时变化。该协议使我们发现了一个大的、长寿命的悬臂频率偏移。基于其大小、寿命和场依赖性，我们初步将这个持续信号归因于通过从氮氧化物自旋转移极化而产生的氘核自旋磁化强度。
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