Mechanically Detected Nuclear Magnetic Resonance at Room Temperature and Normal Pressure

✍ Scribed by Arnd Schaff; Wiebren S. Veeman

• Publisher: Elsevier Science
• Year: 1997
• Tongue: English
• Weight: 183 KB
• Volume: 126
• Category: Article
• ISSN: 1090-7807
• DOI: 10.1006/jmre.1997.1151

✦ Synopsis

Mechanically detected magnetic resonance (MMR) is a new make the magnetization as high as possible. Another aim technique for detecting electron or nuclear spin signals. All precedcould be to develop a routine high-resolution technique for ing experiments have been carried out in a õ10 03 Torr vacuum the spin-density reconstruction of samples such as polymer at room temperature or at low temperatures down to 6 K. In this materials or biological samples. Especially biological samarticle the first MMR experiments at normal pressure and room ples, like living cells, would require the possibility of meatemperature are presented. The mechanically detected NMR sigsurements at room temperature and normal pressure. Therenals resulted from ammonium nitrate and ammonium sulfate. In fore we are trying to develop MMR under these conditions. addition, techniques for determining T 1 and T 1r with mechanical With MMR only certain regions in the sample contribute experiments were developed. If T 1r is not more than two or three to the signal. This can be used to map the spin density of times smaller than T 1 , an inversion-recovery technique, first used the sample, turning the instrument into a magnetic resonance for the detection of 19 F spins at low temperatures, can be used. It could be shown that this technique also works in principle at room microscope. Such experiments have already successfully temperature. ᭧ 1997 Academic Press been performed (8). In heterogeneous materials (polymers, biological cells) one can expect a wide range of values for the various spin relaxation times.