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Core - Analytical Chemistry

    Chapter 7

    Principles of Nuclear Magnetic Resonance

    7.1 : Nuclear Magnetic Resonance (NMR): Overview01:07

    7.1 : Nuclear Magnetic Resonance (NMR): Overview

    Nuclear magnetic resonance (NMR) is a phenomenon exhibited by certain nuclei that can absorb characteristic radio frequency radiation under certain ...

    2.2K views
    7.2 : Atomic Nuclei: Nuclear Spin01:08

    7.2 : Atomic Nuclei: Nuclear Spin

    All atomic particles possess an intrinsic angular momentum, or 'spin'. Electrons, protons, and neutrons each have a spin value of ½, although ...

    1.7K views
    7.3 : Atomic Nuclei: Nuclear Magnetic Moment00:59

    7.3 : Atomic Nuclei: Nuclear Magnetic Moment

    All atomic nuclei are positively charged. When they have a nonzero spin, they behave like rotating charges. As a consequence of their charge and spin, ...

    1.1K views
    7.4 : Atomic Nuclei: Nuclear Spin State Overview01:03

    7.4 : Atomic Nuclei: Nuclear Spin State Overview

    NMR-active nuclei have energy levels called 'spin states' that are associated with the orientations of their nuclear magnetic moments. In the ...

    876 views
    7.5 : Atomic Nuclei: Nuclear Spin State Population Distribution01:14

    7.5 : Atomic Nuclei: Nuclear Spin State Population Distribution

    Near absolute zero temperatures, in the presence of a magnetic field, the majority of nuclei prefer the lower energy spin-up state to the higher energy ...

    948 views
    7.6 : Atomic Nuclei: Larmor Precession Frequency01:11

    7.6 : Atomic Nuclei: Larmor Precession Frequency

    The earth's gravitational field produces a 'twisting force' perpendicular to the angular momentum of a spinning mass (such as a spinning top) ...

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    7.7 : Atomic Nuclei: Magnetic Resonance01:05

    7.7 : Atomic Nuclei: Magnetic Resonance

    The number of nuclear spins aligned in the lower energy state is slightly greater than those in the higher energy state. In the presence of an external ...

    631 views
    7.8 : Atomic Nuclei: Nuclear Relaxation Processes01:23

    7.8 : Atomic Nuclei: Nuclear Relaxation Processes

    In the absence of an external magnetic field, nuclear spin states are degenerate and randomly oriented. When a magnetic field is applied, the spins begin ...

    629 views
    7.9 : Atomic Nuclei: Types of Nuclear Relaxation01:28

    7.9 : Atomic Nuclei: Types of Nuclear Relaxation

    Relaxation in NMR systems is a first-order exponential decay and can occur by either spin–lattice or spin–spin mechanisms. Spin–lattice ...

    260 views
    7.10 : NMR Spectrometers: Overview01:20

    7.10 : NMR Spectrometers: Overview

    NMR spectrometers consist of a strong magnet, a radiofrequency transmitter, and a detector attached to a computer console for recording spectra of samples ...

    1.1K views
    7.11 : NMR Spectrometers: Radiofrequency Pulses and Pulse Sequences01:17

    7.11 : NMR Spectrometers: Radiofrequency Pulses and Pulse Sequences

    A pulse is a short burst of radio waves distributed over a range of frequencies that simultaneously excites all the nuclei in the sample. Upon passing a ...

    762 views
    7.12 : NMR Spectrometers: Resolution and Error Correction01:14

    7.12 : NMR Spectrometers: Resolution and Error Correction

    When magnetic nuclei in a sample achieve resonance and undergo relaxation, the signal detected in NMR is an approximately exponential free induction ...

    672 views
    7.13 : Diamagnetic Shielding of Nuclei: Local Diamagnetic Current01:14

    7.13 : Diamagnetic Shielding of Nuclei: Local Diamagnetic Current

    An applied magnetic field causes the electrons present in the molecule to circulate, setting up a local diamagnetic current within the molecule. The local ...

    839 views
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