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    Please use this identifier to cite or link to this item: https://ir.fy.edu.tw:8080/ir/handle/987654321/10190

    Title: Sensitivity Enhancement in Field-Modulated CW ENDOR via RF Bandwidth Broadening
    Authors: Hoffman, B.M.;Derose, V.J.;Ong,J. L.;Davoust, C.E.
    Contributors: 輔英科技大學 應用化學及材料科學系
    Date: 1994-09
    Issue Date: 2010-11-18 17:58:01 (UTC+8)
    Abstract: In low-temperature ENDOR studies it is common to modulate the magnetic field at νmod 100 kHz and to observe the ENDOR response as a change in the dispersion-mode rapid-passage EPR signal as decoded at νmod. The sensitivity of this procedure can be increased by incoherently broadening the bandwidth of the applied RF through mixing of the RF carrier signal with a white-noise source of variable bandwidth. This technique has been explored by monitoring the amplitude and width of ENDOR signals as a function of the RF bandwidth and power, in the case of the 57Fe signals from a metalloprotein and 14N, 1H signals from two Cu(II) compounds. The RF band broadening has produced signal enhancements of over threefold. The results are interpreted in terms of a competition between (i) an increase in the number of spin packets excited within the inhomogeneously broadened ENDOR line and () a reduction in the response per packet. Simple analysis leads to equations for the variation in the ENDOR response with incident RF power and bandwidth that are scaled by a saturation RF power and an effective spin-packet width, respectively.
    Relation: Journal of Magnetic Resonance, Series A,Volume 110, Issue 1, Pages 52-57
    Appears in Collections:[應用化學及材料科學系] 期刊論文

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