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Related Concept Videos

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...
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Phase Contrast and Differential Interference Contrast Microscopy

Phase-Contrast Microscopes
In-phase-contrast microscopes, interference between light directly passing through a cell and light refracted by cellular components is used to create high-contrast, high-resolution images without staining. It is the oldest and simplest type of microscope that creates an image by altering the wavelengths of light rays passing through the specimen. Altered wavelength paths are created using an annular stop in the condenser. The annular stop produces a hollow cone of...
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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.
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In IR spectroscopy, signals produced by the X−H bonds (such as C−H, O−H, or N−H) can be observed in the frequency range of  2700–4000 cm–1. The C−H stretching vibration forms sharp bands in the region 2850–3000 cm–1. The presence of the O−H stretching vibration leads to the forming of an absorption band in the frequency range 3650–3200 cm−1. At the same time, N−H stretching can be confirmed by absorption bands in the 3500–3100 cm−1 range. Even though both O−H and N−H bonds vibrate at a similar...
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Implementation of a Reference Interferometer for Nanodetection
16:11

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Published on: April 26, 2014

Vibration-resistant phase-shifting interferometry.

L Deck

    Applied Optics
    |December 15, 2010
    PubMed
    Summary
    This summary is machine-generated.

    This study introduces a novel method to enhance phase-shifting interferometry by reducing sensitivity to vibrations. The technique combines high-temporal and high-spatial resolution data for improved topographical measurements.

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    Area of Science:

    • Optical Metrology
    • Vibration Analysis
    • Surface Characterization

    Background:

    • Phase-shifting interferometry (PSI) is susceptible to external vibrations.
    • Vibrations introduce phase errors, compromising measurement accuracy and spatial resolution.

    Purpose of the Study:

    • To develop a method for reducing vibration sensitivity in PSI.
    • To maintain high spatial resolution while improving vibration immunity.

    Main Methods:

    • Amplitude splitting of the interferogram into two simultaneous data sets.
    • Acquiring complementary data: one high-temporal/low-spatial resolution, the other low-temporal/high-spatial resolution.
    • Utilizing high-temporal data to correct phase increments in the high-spatial data using a generalized phase-extraction algorithm.

    Main Results:

    • Successfully reduced the impact of external vibrations on interferometric measurements.
    • Achieved enhanced vibration immunity without compromising the high spatial resolution of topographical measurements.
    • Demonstrated the synergistic benefit of combining complementary data sets.

    Conclusions:

    • The proposed method effectively mitigates vibration-induced errors in PSI.
    • This technique offers a robust solution for accurate topographical measurements in vibration-prone environments.
    • The approach preserves high spatial resolution, crucial for detailed surface analysis.