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Updated: Jan 21, 2026

A Practical Guide on Coupling a Scanning Mobility Sizer and Inductively Coupled Plasma Mass Spectrometer SMPS-ICPMS
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Gay, Lesbian, and Heterosexual Couples About to Begin Couples Therapy: An Online Relationship Assessment of 40,681

John M Gottman1, Julie S Gottman1, Carrie Cole1

  • 1The Gottman Institute.

Journal of Marital and Family Therapy
|August 3, 2019
PubMed

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Two NMR-active nuclei bonded to a central atom can be involved in geminal or two-bond coupling. Geminal coupling is commonly seen between diastereotopic protons in chiral molecules and unsymmetrical alkenes, among others.
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Vicinal or three-bond coupling is commonly observed between protons attached to adjacent carbons. Here, nuclear spin information is primarily transferred via electron spin interactions between adjacent C‑H bond orbitals. This generally favors the antiparallel arrangement of spins, so 3J values are usually positive.
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