| Autor: |
Eaton, G., Eaton, S., Stoner, J., Quine, R., Rinard, G., Smirnov, A., Weber, R., Krzystek, J., Hassan, A., Brunel, L., Demortier, A. |
| Zdroj: |
Applied Magnetic Resonance; Dec2001, Vol. 21 Issue 3/4, p563-570, 8p |
| Abstrakt: |
Electron paramagnetic resonance spectra of the S3/− radical center in ultramarine blue over a factor of about 2500 in frequency (258 MHz to 670 GHz) reveal a substantially Lorentzian shape, without resolution of g anisotropy. Variable temperature measurements found that the line width is independent of temperature, within experimental uncertainty, up to about 90 K at 9.5 GHz and between ca. 5 K and room temperature at 95 and 217 GHz, as expected for an exchange-narrowed signal. Analysis of the increase in the low-temperature line width as a function of frequency above 9 GHz is consistent with an exchange interaction of about 2· 10−2 K. The line width increases as frequency is decreased from 2.7 GHz to 258 MHz which is attributed to the contribution from nonsecular terms that has been denoted the “10/3” effect. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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