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Related Concept Videos

IR Spectrometers01:25

IR Spectrometers

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There are two main infrared (IR) spectrophotometers: dispersive IR spectrometers and Fourier transform infrared (FTIR) spectrometers. In a dispersive IR spectrometer, a beam of infrared radiation produced by a hot wire is divided into two parallel equal-intensity beams using mirrors. One beam passes through the sample, while another is a reference beam. The beams then move through the monochromator, which separates the radiations into a continuous spectrum of different frequencies. The...
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IR Spectrum Peak Splitting: Symmetric vs Asymmetric Vibrations01:08

IR Spectrum Peak Splitting: Symmetric vs Asymmetric Vibrations

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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...
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IR Spectroscopy: Molecular Vibration Overview01:24

IR Spectroscopy: Molecular Vibration Overview

6.1K
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...
6.1K
IR Frequency Region: Fingerprint Region01:03

IR Frequency Region: Fingerprint Region

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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...
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Atomic Emission Spectroscopy: Interference01:30

Atomic Emission Spectroscopy: Interference

744
In atomic emission spectroscopy (AES), high-temperature atomizers excite a broad range of elements and molecules that generate complex emissions from sources such as oxides, hydroxides, and flame combustion products in the flame or plasma. Several strategies can be employed to minimize spectral interferences caused by overlapping emission lines or bands. These include increasing instrument resolution, choosing alternative emission lines, optimally placing the detector in low-background regions,...
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IR Spectroscopy: Hooke's Law Approximation of Molecular Vibration01:16

IR Spectroscopy: Hooke's Law Approximation of Molecular Vibration

3.6K
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...
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Implementation of a Reference Interferometer for Nanodetection
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Measurement of microresonator frequency comb coherence by spectral interferometry.

K E Webb, J K Jang, J Anthony

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    Summary

    This study explores spectral coherence in microresonator optical frequency combs using a novel spectral interference method. Different combs exhibit distinct coherence characteristics, aligning with theoretical modulation instability regimes.

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    Area of Science:

    • Photonics and Optics
    • Quantum Optics
    • Nonlinear Optics

    Background:

    • Microresonator optical frequency combs are crucial for precise frequency generation.
    • Understanding their spectral coherence is vital for advanced applications.
    • Existing methods for coherence assessment are limited.

    Purpose of the Study:

    • To experimentally investigate the spectral coherence of microresonator optical frequency combs.
    • To apply a spectral interference method to assess coherence across the comb bandwidth.
    • To compare experimental findings with theoretical predictions.

    Main Methods:

    • Utilized a spectral interference technique, adapted from supercontinuum generation studies.
    • Measured the complex degree of first-order coherence across the full bandwidth of two distinct frequency combs.
    • Performed numerical simulations to validate experimental observations.

    Main Results:

    • Observed significantly different coherence characteristics between the two investigated frequency combs.
    • Identified dynamical regimes that closely resemble stable and unstable modulation instability regimes.
    • Demonstrated excellent agreement between experimental data and numerical simulations.

    Conclusions:

    • The spectral interference method provides a new technique for assessing optical frequency comb stability.
    • Experimental results offer strong validation for prior theoretical analyses of comb dynamics.
    • The findings enhance understanding of microresonator comb coherence and stability.