The impact of excitation frequency on the nuclear modulation of electron spin echoes: 14N hyperfine and quadrupole interactions of DPPH in disordered solids

✍ Scribed by Heather L. Flanagan; David J. Singel

• Publisher: Elsevier Science
• Year: 1987
• Tongue: English
• Weight: 645 KB
• Volume: 137
• Category: Article
• ISSN: 0009-2614
• DOI: 10.1016/0009-2614(87)80906-5

✦ Synopsis

Electron spin-echo envelope modulations of DPPH in glassy and polycrystalline solids at 100 K have been measured at 4.6 and 9.1 GHz electron spin excitation frequencies. 14N hyperfine and quadrupole coupling parameters have been evaluated through comparison of the experimental data waveforms and the corresponding spectra with simulated modulation patterns and associated frequency histograms. Because of the strong excitation frequency dependence of ESEEM, agreement between the observed and the simulated results at octave-separated excitation frequencies leads to a significant improvement in the accuracy of the derived couplings.