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Related Concept Videos

Atomic Emission Spectroscopy: Overview01:20

Atomic Emission Spectroscopy: Overview

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Atomic emission spectroscopy (AES) is an analytical technique used to determine the elemental composition of a sample by analyzing the light emitted from excited atoms. In AES, atoms in a sample are excited to higher energy levels by thermal energy from high-temperature sources, such as plasma, arcs, or sparks. When these excited atoms return to lower energy states, they emit light at specific wavelengths characteristic of each element. The resulting atomic emission spectrum, which consists of...
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Atomic Spectroscopy: Absorption, Emission, and Fluorescence01:23

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Atomic spectroscopy is a vital tool in elemental analysis, both qualitatively and quantitatively. It can be broadly divided into optical spectroscopy, mass spectroscopy, and X-ray spectroscopy methods. The optical spectroscopic methods are atomic absorption spectroscopy (AAS), atomic emission spectroscopy (AES), and atomic fluorescence spectroscopy (AFS). The first step in all three methods is atomization, where the solid, liquid, or solution-phase samples are converted into gas-phase atoms and...
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UV–Vis Spectroscopy: Molecular Electronic Transitions01:16

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In Ultraviolet–Visible (UV–Vis) spectroscopy, the absorption of electromagnetic radiation is used to probe the electronic structure of molecules. This technique provides insights into molecular electronic transitions, particularly the movement of electrons between different molecular orbitals. Radiation is absorbed if the energy of the electromagnetic radiation passing through the molecule is precisely equal to the energy difference between the excited and ground states. During this...
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Atomic Emission Spectroscopy: Instrumentation01:22

Atomic Emission Spectroscopy: Instrumentation

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The instrumentation of atomic emission spectrometry (AES) involves various components, including atomization devices that convert samples into gas-phase atoms and ions. There are two main types of atomization devices: continuous and discrete atomizers.  Continuous atomizers, like plasmas and flames, introduce samples in a constant stream, while discrete atomizers inject individual samples using syringes or autosamplers. The most common discrete atomizer is the electrothermal atomizer.
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Atomic Fluorescence Spectroscopy01:29

Atomic Fluorescence Spectroscopy

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Atomic fluorescence spectroscopy (AFS) is an analytical technique that involves the electronic transitions of atoms in a flame, furnace, or plasma being excited by electromagnetic (EM) radiation. When these atoms absorb energy, they become excited and subsequently release energy as they return to their original state. This emitted light, or "fluorescence," is observed at a right angle to the incident beam. Both absorption and emission processes transpire at distinct wavelengths, which...
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Molecular Spectroscopy: Absorption and Emission01:14

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Molecules possess discrete energy levels called quantum states. Unlike atoms, which have simpler energy levels, molecules possess additional rotational and vibrational energy levels. Each energy level is separated by an energy gap, with the gaps between adjacent electronic, vibrational, and rotational levels varying significantly. The three types of energy levels in a diatomic molecule are shown in Figure 1.
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An Experimental Protocol for Femtosecond NIR/UV - XUV Pump-Probe Experiments with Free-Electron Lasers
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Resolving multi-exciton generation by attosecond spectroscopy.

A J Neukirch, D M Neumark, M F Kling

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    |November 18, 2014
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    This summary is machine-generated.

    This study introduces a new spectroscopy method to understand multiexciton generation in nanomaterials. It distinguishes between single exciton creation and coherent multiexciton generation, revealing scattering times.

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    Area of Science:

    • Quantum optics
    • Materials science
    • Spectroscopy

    Background:

    • Multiexciton (ME) generation in nanoscale systems is crucial for optoelectronic applications.
    • Controversies exist regarding the mechanisms of ME generation, specifically coherent versus incoherent pathways.

    Purpose of the Study:

    • To propose an experimentally viable attosecond transient absorption spectroscopy (ATAS) scheme.
    • To resolve controversies surrounding ME generation mechanisms in nanoscale systems.
    • To determine exciton-phonon scattering times.

    Main Methods:

    • Utilizing attosecond transient absorption spectroscopy (ATAS).
    • Analyzing oscillatory signals in the spectroscopic data.
    • Measuring the decay of oscillations at different temperatures.

    Main Results:

    • Absence of oscillations indicates single exciton generation followed by incoherent impact ionization.
    • Oscillations reveal coherent ME generation involving superpositions of single and ME states.
    • Oscillation decay times (5-20 fs) quantify elastic exciton-phonon scattering.

    Conclusions:

    • The proposed ATAS scheme can experimentally differentiate between coherent and incoherent ME generation pathways.
    • Exciton-phonon scattering times can be accurately determined using this spectroscopic method.
    • Multiple-cycle pump pulses are optimal for observing the spectroscopic signal.