Measurement of the Longitudinal Relaxation Time by Continuous-Wave, Nonlinear Electron Spin Resonance Spectroscopies

✍ Scribed by F. Cianflone; F. Francia; D. Leporini

• Publisher: Elsevier Science
• Year: 1998
• Tongue: English
• Weight: 159 KB
• Volume: 131
• Category: Article
• ISSN: 1090-7807
• DOI: 10.1006/jmre.1997.1303

✦ Synopsis

We characterize a continuous-wave, nonlinear electron spin resbe shown that the above feature is ensured by proper nonlinonance spectroscopy which detects the longitudinal component of ear ESR spectroscopies. the magnetization. It is demonstrated that the signal is propor-To the best of the authors' knowledge only few attempts tional to the Laplace transform of a relaxation function with decay tackling the above question were reported. Pescia, following time equal to the longitudinal relaxation time T 1 . The conclusion a scheme by Whitfield and Redfield (5), developed a moduis reached by comparing T 1 to the effective time T ( eff ) 1 being drawn lation technique whose linewidth was successfully compared by progressive saturation for a nitroxide radical dissolved in superto T 1 which was drawn by progressive saturation (6). The cooled o-terphenyl. ᭧ 1998 Academic Press comparison took into examination only spin systems with S Å 1

2 and, therefore, is not conclusive. Moreover, it is well known that progressive saturation measures an effective T 1 ,