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¹³C NMR: ¹H–¹³C Decoupling01:04

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The probability of having two carbon-13 atoms next to each other is negligible because of the low natural abundance of carbon-13. Consequently, peak splitting due to carbon-carbon spin-spin coupling is not observed in spectra. However, protons up to three sigma bonds away split the carbon signal according to the n+1 rule, resulting in complicated spectra.
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In the AX proton spin system, proton A can sense the two spin states of a coupled proton X, resulting in a doublet NMR signal with two peaks of equal (1:1) intensity. When proton A is coupled to two equivalent protons (AX2 spin system), the spin states of each X can be aligned with or against the external field, creating three possible scenarios. This results in a 1:2:1  triplet signal, where the central peak corresponds to the chemical shift of A and is twice as large or intense as the...
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A proton M that is coupled to a proton X results in doublet signals for M. However, NMR-active nuclei can be simultaneously coupled to more than one nonequivalent nucleus. When M is coupled to a second proton A, such as in styrene oxide, each peak in the doublet is split into another doublet.
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    Area of Science:

    • Metamaterials
    • Terahertz (THz) technology
    • Wave optics

    Background:

    • Terahertz waves are crucial for diverse applications.
    • Metamaterial beam splitters offer control over THz waves.
    • Existing methods often require complex multi-bit coding elements.

    Purpose of the Study:

    • To introduce a new, flexible coding scheme for metamaterial beam splitters.
    • To achieve higher degrees of freedom in terahertz beam splitting.
    • To experimentally validate the proposed design strategy.

    Main Methods:

    • Development of a 1-bit "offset" coding scheme using binary "0" and "1" elements.
    • Designing metamaterial beam splitters with non-integer coding periods.
    • Experimental verification of the proposed coding scheme.

    Main Results:

    • The "offset" coding scheme enables non-integer multiples for coding periods.
    • Achieved enhanced degrees of freedom in terahertz beam splitting.
    • Experimental validation confirmed the effectiveness of the new design.

    Conclusions:

    • The novel "offset" coding scheme provides greater flexibility for terahertz beam splitters.
    • This approach offers significant potential for advanced wave control.
    • The scheme is also relevant for radar cross-section reduction.