The construction and performance of a cryogenic 35 GHz Pulse electron nuclear double resonance (ENDOR) probehead for large samples is presented. The resonator is based on a rectangular TE102 Cavity in which the radio frequency (rf) B-2-field is generated by a two turn saddle ENDOR coil crossing the resonator along the sample axis with minimal distance to the sample tube. An rf power efficiency factor is used to define the B-2-field strength per square-root of the transmitted rf power over the frequency range 2-180 MHz. The distributions of the microwave B-1- and E-1-field, and the rf B-2-field are investigated by electromagnetic field calculations. All dielectrics, the sample tube, and coupling elements are included in the Calculations. The application range of the probehead and the advantages of using large sample sizes are demonstrated and discussed on a number of paramagnetic samples containing transition metal ions.
Tschaggelar, R., Kasumaj, B., Santangelo, M.G., Forrer, J., Leger, P., Dube, H., et al. (2009). Cryogenic 35 GHz pulse ENDOR probehead accommodating large sample sizes: Performance and applications. JOURNAL OF MAGNETIC RESONANCE, 200, 81-87 [10.1016/j.jmr.2009.06.007].
Cryogenic 35 GHz pulse ENDOR probehead accommodating large sample sizes: Performance and applications
SANTANGELO, Maria Grazia;
2009-01-01
Abstract
The construction and performance of a cryogenic 35 GHz Pulse electron nuclear double resonance (ENDOR) probehead for large samples is presented. The resonator is based on a rectangular TE102 Cavity in which the radio frequency (rf) B-2-field is generated by a two turn saddle ENDOR coil crossing the resonator along the sample axis with minimal distance to the sample tube. An rf power efficiency factor is used to define the B-2-field strength per square-root of the transmitted rf power over the frequency range 2-180 MHz. The distributions of the microwave B-1- and E-1-field, and the rf B-2-field are investigated by electromagnetic field calculations. All dielectrics, the sample tube, and coupling elements are included in the Calculations. The application range of the probehead and the advantages of using large sample sizes are demonstrated and discussed on a number of paramagnetic samples containing transition metal ions.
| File | Dimensione | Formato | |
|---|---|---|---|
|
1-s2.0-S1090780709001608-main.pdf
Solo gestori archvio
Descrizione: pdf
Dimensione
570.83 kB
Formato
Adobe PDF
|
570.83 kB | Adobe PDF | Visualizza/Apri Richiedi una copia |
I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
