Jove
Visualize
Contact Us
JoVE
x logofacebook logolinkedin logoyoutube logo
ABOUT JoVE
OverviewLeadershipBlogJoVE Help Center
AUTHORS
Publishing ProcessEditorial BoardScope & PoliciesPeer ReviewFAQSubmit
LIBRARIANS
TestimonialsSubscriptionsAccessResourcesLibrary Advisory BoardFAQ
RESEARCH
JoVE JournalMethods CollectionsJoVE Encyclopedia of ExperimentsArchive
EDUCATION
JoVE CoreJoVE BusinessJoVE Science EducationJoVE Lab ManualFaculty Resource CenterFaculty Site
Terms & Conditions of Use
Privacy Policy
Policies

Related Concept Videos

Group Polarization01:01

Group Polarization

39.2K
Group polarization is the strengthening of an original group attitude following the discussion of views within a group (Teger & Pruitt, 1967). That is, if a group initially favors a viewpoint, after discussion the group consensus is likely a stronger endorsement of the viewpoint. Conversely, if the group was initially opposed to a viewpoint, group discussion would likely lead to stronger opposition.
39.2K
Molecular Shape and Polarity03:37

Molecular Shape and Polarity

75.6K
Dipole Moment of a Molecule
75.6K
NMR Spectroscopy: Spin–Spin Coupling01:08

NMR Spectroscopy: Spin–Spin Coupling

3.2K
The spin state of an NMR-active nucleus can have a slight effect on its immediate electronic environment. This effect propagates through the intervening bonds and affects the electronic environments of NMR-active nuclei up to three bonds away; occasionally, even farther. This phenomenon is called spin–spin coupling or J-coupling. Coupling interactions are mutual and result in small changes in the absorption frequencies of both nuclei involved. While nuclei of the same element are involved...
3.2K
Spin–Spin Coupling: One-Bond Coupling01:17

Spin–Spin Coupling: One-Bond Coupling

1.5K
Coupling interactions are strongest between NMR-active nuclei bonded to each other, where spin information can be transmitted directly through the pair of bonding electrons. While nuclei polarize their electrons to the opposite spins, the bonding electron pair has opposite spins. Configurations with antiparallel nuclear spins are expected to be lower in energy. When coupling makes antiparallel states more favorable, J is considered to have a positive value. The one-bond coupling constant, 1J,...
1.5K
Spin–Spin Coupling Constant: Overview01:08

Spin–Spin Coupling Constant: Overview

1.5K
In bromoethane, the three methyl protons are coupled to the two methylene protons that are three bonds away. In accordance with the n+1 rule, the signal from the methyl protons is split into three peaks with 1:2:1 relative intensities. The methylene protons appear as a quartet, with the relative intensities of 1:3:3:1.
Qualitatively, any spin plus-half nucleus polarizes the spins of its electrons to the minus-half state. Consequently, the paired electron in the hydrogen–carbon bond must...
1.5K
Spin–Spin Coupling: Two-Bond Coupling (Geminal Coupling)01:20

Spin–Spin Coupling: Two-Bond Coupling (Geminal Coupling)

1.7K
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.
The central atom need not be NMR-active because its electrons are affected by the electron polarization of the spin-active atoms. However, spin information is transmitted less effectively than in one-bond coupling, and 2J values are usually weaker than 1J values. The energy of...
1.7K

You might also read

Related Articles

Articles linked to this work by shared authors, journal, and citation graph.

Sort by
Same author

THz to far-infrared spectra of the known crystal polymorphs of phenylalanine.

Physical chemistry chemical physics : PCCP·2024
Same author

Transient Valence Charge Localization in Strong-Field Dissociative Ionization of HCl Molecules.

Physical review letters·2021
Same author

Observing collisions beyond the secular approximation limit.

Nature communications·2019
Same author

A generalized vibronic-coupling Hamiltonian for molecules without symmetry: Application to the photoisomerization of benzopyran.

The Journal of chemical physics·2019
Same author

Polarized all-normal dispersion supercontinuum reaching 2.5 µm generated in a birefringent microstructured silica fiber.

Optics express·2017
Same author

Rotated echoes of molecular alignment: fractional, high order and imaginary.

Optics express·2017

Related Experiment Video

Updated: Jan 30, 2026

How to Build a Vacuum Spring-transport Package for Spinning Rotor Gauges
09:26

How to Build a Vacuum Spring-transport Package for Spinning Rotor Gauges

Published on: April 7, 2016

9.6K

Polarization-based tachometer for measuring spinning rotors.

Emilien Prost, Edouard Hertz, Franck Billard

    Optics Express
    |January 18, 2019
    PubMed
    Summary
    This summary is machine-generated.

    We developed a new method using spinning molecules to generate polarized ultraviolet light. This technique allows for precise measurement of molecular rotation speed, acting as a molecular tachometer.

    More Related Videos

    Experimental Methods for Spin- and Angle-Resolved Photoemission Spectroscopy Combined with Polarization-Variable Laser
    09:00

    Experimental Methods for Spin- and Angle-Resolved Photoemission Spectroscopy Combined with Polarization-Variable Laser

    Published on: June 28, 2018

    10.5K
    Fluorescence Lifetime Imaging of Molecular Rotors in Living Cells
    09:45

    Fluorescence Lifetime Imaging of Molecular Rotors in Living Cells

    Published on: February 9, 2012

    25.9K

    Related Experiment Videos

    Last Updated: Jan 30, 2026

    How to Build a Vacuum Spring-transport Package for Spinning Rotor Gauges
    09:26

    How to Build a Vacuum Spring-transport Package for Spinning Rotor Gauges

    Published on: April 7, 2016

    9.6K
    Experimental Methods for Spin- and Angle-Resolved Photoemission Spectroscopy Combined with Polarization-Variable Laser
    09:00

    Experimental Methods for Spin- and Angle-Resolved Photoemission Spectroscopy Combined with Polarization-Variable Laser

    Published on: June 28, 2018

    10.5K
    Fluorescence Lifetime Imaging of Molecular Rotors in Living Cells
    09:45

    Fluorescence Lifetime Imaging of Molecular Rotors in Living Cells

    Published on: February 9, 2012

    25.9K

    Area of Science:

    • Nonlinear optics
    • Molecular physics
    • Ultrafast spectroscopy

    Background:

    • Coherent molecular rotation can be initiated using tailored laser pulses.
    • Third-harmonic generation (THG) is a nonlinear optical process sensitive to molecular properties.

    Purpose of the Study:

    • To analyze the polarization of third-harmonic generation (THG) from coherently spinning molecules.
    • To develop a method for measuring the rotational speed of molecules using THG polarization.

    Main Methods:

    • Initiating molecular rotation with a circularly polarized pulse.
    • Driving THG with a time-delayed, circularly polarized pulse.
    • Analyzing the polarization state and ellipticity of the generated THG.

    Main Results:

    • THG exhibits a high degree of circular polarization with opposite handedness for the two generated harmonics.
    • The polarization of THG allows for tracking the molecular axis orientation.
    • The method successfully infers the average angular velocity of the spinning molecules.

    Conclusions:

    • Spinning molecules enable efficient generation of well-polarized THG.
    • Polarization analysis of THG serves as a sensitive probe of molecular rotation.
    • This technique offers a novel, user-friendly polarization-based tachometer for measuring molecular rotational speeds.