Parahydrogen

2020-09-02 16:24  下载量：0

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Parahydrogen is one of two magnetic forms of hydrogen gas (H2). It’s commonly used to increase the sensitivity of NMR and MRI measurements. Molecular hydrogen consists of two atoms. Each of the atoms has a spinning nucleus. Based on the direction of the nuclear spin, there are two types of hydrogens. If the spins of the two hydrogen nuclei are aligned, it’s orthohydrogen. If the spins are opposed, it’s parahydrogen.In general, hydrogens is an equilibrium mixture of ortho- and para-hydrogen. There is a tiny energy difference between the two magnetic states.

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