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Related Concept Videos

Double Resonance Techniques: Overview01:12

Double Resonance Techniques: Overview

Double resonance techniques in Nuclear Magnetic Resonance (NMR) spectroscopy involve the simultaneous application of two different frequencies or radiofrequency pulses to manipulate and observe two distinct nuclear spins. One important application of double resonance is spin decoupling, which selectively suppresses coupling with one type of nucleus while observing the NMR signal from another nucleus, simplifying the spectrum and enhancing resolution.
Spin decoupling is usually achieved by...
IR Spectroscopy: Molecular Vibration Overview01:24

IR Spectroscopy: Molecular Vibration Overview

When Infrared (IR) radiation passes through a covalently bonded molecule, the bonds transition from lower to higher vibrational levels. The fundamental vibrational motions that result in infrared absorption can be classified as stretching or bending vibrations.
Stretching vibrations are vibrational motions that occur along the bond line, changing the bond length or distance between two bonded atoms. They are further distinguished as symmetric or asymmetric. In symmetric stretching, the...
IR and UV–Vis Spectroscopy of Aldehydes and Ketones01:29

IR and UV–Vis Spectroscopy of Aldehydes and Ketones

Infrared spectroscopy, also known as vibrational spectroscopy, is mainly used to determine the types of bonds and functional groups in molecules. In aldehydes and ketones, the carbonyl (C=O) bond shows an absorption around 1710 cm-1. The C=O bond vibration of an aldehyde occurs at lower frequencies than that of a ketone. In addition to the C=O absorption in an aldehyde, the aldehydic C–H bond also gives two peaks in the 2700–2800 cm-1 range. This absorption, coupled with the C=O stretching, is...
IR Spectrum Peak Splitting: Symmetric vs Asymmetric Vibrations01:08

IR Spectrum Peak Splitting: Symmetric vs Asymmetric Vibrations

Identical bonds within a polyatomic group can stretch symmetrically (in-phase) or asymmetrically (out-of-phase). Similar to hydrogen bonding, these vibrations also influence the shape of the IR peak. Generally, asymmetric stretching frequencies are higher than symmetric stretching frequencies. For example, primary amines exhibit two distinct IR peaks between 3300–3500 cm−1 corresponding to the symmetric and asymmetric N-H stretching, while secondary amines exhibit a single stretching vibration...
IR Spectroscopy: Hooke's Law Approximation of Molecular Vibration01:16

IR Spectroscopy: Hooke's Law Approximation of Molecular Vibration

A covalently bonded heteronuclear diatomic molecule can be modeled as two vibrating masses connected by a spring. The vibrational frequency of the bond can be expressed using an equation derived from Hooke's law, which describes how the force applied to stretch or compress a spring is proportional to the displacement of the spring. In this case, the atoms behave like masses, and the bond acts like a spring.
According to Hooke's law, the vibrational frequency is directly proportional to the...
IR Frequency Region: Fingerprint Region01:03

IR Frequency Region: Fingerprint Region

IR spectra are divided into two main regions: the diagnostic region and the fingerprint region. The diagnostic region of the spectrum lies above 1500 cm−1. The absorptions resulting from single-bond vibrations of the N–H, C–H, and O–H stretch at higher wavenumbers and appear on the left side of the spectrum. The stretching absorptions of the C≡C and C≡N occur between 2100–2300 cm−1. In contrast, those arising from stretching absorptions of the C=O, C=N, and C=C occur between 1600–1850 cm−1.
The...

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Related Experiment Video

Updated: Jun 22, 2026

Rejection of Fluorescence Background in Resonance and Spontaneous Raman Microspectroscopy
15:04

Rejection of Fluorescence Background in Resonance and Spontaneous Raman Microspectroscopy

Published on: May 18, 2011

Antiresonant-ring Kerr spectroscopy.

Qin Zhong, Xiang Zhu, John T Fourkas

    Optics Express
    |June 24, 2009
    PubMed
    Summary
    This summary is machine-generated.

    We developed a novel method using a Sagnac interferometer to measure optical Kerr effect tensor elements. This technique allows for precise control and subtraction of specific contributions to the optical Kerr effect response.

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    Area of Science:

    • Nonlinear Optics
    • Materials Science
    • Spectroscopy

    Background:

    • The optical Kerr effect (OKE) is a fundamental nonlinear optical phenomenon.
    • Accurate measurement of OKE tensor elements is crucial for understanding material properties.

    Purpose of the Study:

    • To demonstrate a new scheme for measuring different tensor elements of the optical Kerr effect response.
    • To enable selective enhancement or suppression of specific contributions to the OKE response.

    Main Methods:

    • Utilized a dual-ring, polarization-dependent Sagnac interferometer.
    • Generated two copropagating probe pulses arriving at the sample at different times.
    • Controlled pump pulse polarization to determine the measured tensor element.

    Main Results:

    • Successfully measured distinct tensor elements of the optical Kerr effect response.
    • Demonstrated the ability to perform optical subtraction of OKE tensor elements at different times.
    • Showcased a strategy to enhance or suppress particular contributions to the OKE response.

    Conclusions:

    • The developed Sagnac interferometer scheme offers a versatile approach for OKE measurements.
    • This method provides precise control over the measurement of OKE tensor elements.
    • The technique facilitates advanced analysis by enabling subtraction of specific OKE contributions.