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Related Concept Videos

IR Spectrometers01:25

IR Spectrometers

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...
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 Frequency Region: X–H Stretching01:24

IR Frequency Region: X–H Stretching

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...
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...
Ultraviolet and Visible (UV–Vis) Spectroscopy: Overview01:02

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Atomic Emission Spectroscopy: Interference01:30

Atomic Emission Spectroscopy: Interference

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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The Generation of Higher-order Laguerre-Gauss Optical Beams for High-precision Interferometry
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Published on: August 12, 2013

Extreme ultraviolet interferometry measurements with high-order harmonics.

D Descamps, C Lyngå, J Norin

    Optics Letters
    |December 7, 2007
    PubMed
    Summary

    High-order harmonics from intense laser pulses offer a tunable extreme ultraviolet radiation source for interferometry. This method successfully measured aluminum layer thickness and plasma electron density exceeding 2x10^20 electrons/cm³.

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    Area of Science:

    • Atomic, Molecular, and Optical Physics
    • Plasma Physics
    • Materials Science

    Background:

    • High-order harmonic generation (HHG) produces coherent extreme ultraviolet (XUV) radiation.
    • XUV radiation is valuable for probing matter due to its short wavelengths and interaction properties.
    • Developing compact and tunable XUV sources is crucial for advanced metrology.

    Purpose of the Study:

    • To demonstrate the utility of high-order harmonics as a radiation source for interferometric measurements.
    • To apply HHG-based interferometry for material characterization and plasma diagnostics.

    Main Methods:

    • Generating high-order harmonics using short, intense laser pulses in gases.
    • Utilizing harmonics from the 9th to the 15th order for interferometric measurements.
    • Employing the 11th harmonic for spatially resolved plasma diagnostics.

    Main Results:

    • High-order harmonics were confirmed as a tunable, coherent, and short-pulse XUV radiation source.
    • The thickness of an aluminum layer was successfully measured using selected harmonics.
    • The spatial distribution of electron density in a laser-produced plasma was determined, revealing densities > 2x10^20 electrons/cm³.

    Conclusions:

    • High-order harmonic generation provides a versatile and effective XUV source for interferometry.
    • This technique enables precise measurements of material properties and plasma characteristics.
    • The demonstrated methods pave the way for advanced metrology applications in various scientific fields.