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Related Concept Videos

Atomic Emission Spectroscopy: Instrumentation01:22

Atomic Emission Spectroscopy: Instrumentation

1.5K
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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Inductively Coupled Plasma Atomic Emission Spectroscopy: Instrumentation01:26

Inductively Coupled Plasma Atomic Emission Spectroscopy: Instrumentation

1.1K
Inductively coupled plasma (ICP) is the common plasma source used in atomic emission spectroscopy (AES), a technique that detects and analyzes various elements in a sample. This method is often called inductively coupled plasma atomic emission spectroscopy (ICP-AES).
There are three main types of inductively coupled plasma atomic emission spectroscopy  (ICP-AES) instruments: sequential, simultaneous multichannel, and Fourier transform instruments, with the latter being less commonly used....
1.1K
UV–Vis Spectrometers01:14

UV–Vis Spectrometers

4.0K
The absorbance of UV and visible (UV–visible) radiations is measured using a UV–visible spectrophotometer. Deuterium lamps, which emit UV radiation, and tungsten lamps, which produce radiation in the visible region, are used as light sources in UV–visible spectrophotometers. A monochromator or prism is used for diffraction grating, i.e., to split the incoming radiation into different wavelengths. A system of slits is used to focus the desired wavelength on the sample cell.
4.0K
IR Spectrometers01:25

IR Spectrometers

3.1K
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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Atomic Absorption Spectroscopy: Instrumentation01:22

Atomic Absorption Spectroscopy: Instrumentation

2.1K
An atomic absorption spectrophotometer (AAS) comprises several components: a radiation source, an atomizer, a monochromator, and a detector. The radiation source can be a hollow-cathode lamp (HCL) or an electrodeless-discharge lamp (EDL), both of which provide a narrow emission line of the required wavelength. However, some instruments use continuum sources and high-resolution monochromators to achieve a narrow range of radiation.
The atomizer used in AAS can be either a flame atomizer or an...
2.1K
Atomic Emission Spectroscopy: Lab01:29

Atomic Emission Spectroscopy: Lab

873
AES is a powerful analytical technique, especially effective when used with plasma sources, producing abundant spectra in characteristic emission lines. The Inductively Coupled Plasma (ICP), in particular, yields superior quantitative analytical data due to its high stability, low noise, low background, and minimal interferences under optimal experimental conditions. However, newer air-operated microwave sources are emerging as promising alternatives that could be more cost-effective than...
873

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High Speed Sub-GHz Spectrometer for Brillouin Scattering Analysis
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Dispersion-free continuum two-dimensional electronic spectrometer.

Haibin Zheng, Justin R Caram, Peter D Dahlberg

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    We developed a new two-dimensional electronic spectroscopy instrument for studying ultrafast electronic dynamics. This visible light system uses broadband continuum generation and all-reflective interferometric delays to probe quantum dots and chlorophyll.

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    Area of Science:

    • Physical Chemistry
    • Spectroscopy
    • Materials Science

    Background:

    • Electronic dynamics in condensed phases occur on ultrafast timescales.
    • Two-dimensional electronic spectroscopy (2DES) offers simultaneous frequency and time resolution for studying these dynamics.
    • Existing 2DES techniques can be sensitive to nonlinear dispersion changes in laser pulses.

    Purpose of the Study:

    • To develop a novel 2D electronic spectroscopy system for probing ultrafast dynamics.
    • To address challenges associated with using broadband visible light in phase-sensitive optical experiments.
    • To demonstrate the system's capability in characterizing nonlinear optical responses.

    Main Methods:

    • Development of a 2D spectrometer utilizing broadband continuum generated in argon.
    • Implementation of all-reflective interferometric delays using angled stages for phase stability.
    • Compression of ~180 nm bandwidth light to ~10 fs pulses for high temporal resolution.

    Main Results:

    • Successful implementation of a visible-light 2D electronic spectroscopy system.
    • Demonstration of all-reflective interferometric delay lines for phase-sensitive measurements.
    • Probing of nonlinear optical response in Cadmium Selenide (CdSe) quantum dots.
    • Investigation of electronic transitions in Chlorophyll a.

    Conclusions:

    • The developed 2D electronic spectroscopy system provides a robust platform for studying ultrafast dynamics.
    • The system effectively utilizes broadband visible light for phase-sensitive measurements.
    • The technique is applicable to diverse systems, including nanomaterials and biological molecules.