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Related Concept Videos

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

Ultraviolet and Visible (UV–Vis) Spectroscopy: Overview

Ultraviolet–visible (UV–visible or UV–Vis) spectroscopy is an analytical technique that investigates the interaction between matter and UV–Vis light within the electromagnetic spectrum. This method is widely used for its versatility, simplicity, and relatively quick data acquisition, making it valuable for both qualitative and quantitative analysis. When UV–Vis radiation passes through a material,  molecules absorb light depending on the energy required for electronic transitions. As a result...
Inductively Coupled Plasma Atomic Emission Spectroscopy: Instrumentation01:26

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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).
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Atomic Emission Spectroscopy: Instrumentation01:22

Atomic Emission Spectroscopy: Instrumentation

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.
UV–Vis Spectrometers01:14

UV–Vis Spectrometers

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. Samples for...
Atomic Absorption Spectroscopy: Instrumentation01:22

Atomic Absorption Spectroscopy: Instrumentation

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.
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Raman Spectroscopy Instrumentation: Overview01:26

Raman Spectroscopy Instrumentation: Overview

A conventional Raman spectrophotometer includes a laser source, a sample holding system, a wavelength selector, and a detector.
The monochromatic laser source, typically using visible or near-infrared radiation, generates a highly focused beam of light. This light interacts with the molecules of the sample, scattering some of the light. Liquid and gaseous samples are usually tested in ordinary glass capillaries, while solids can be analyzed as powders packed in capillaries or as potassium...

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ULTRA: A Unique Instrument for Time-Resolved Spectroscopy.

Gregory M Greetham1, Pierre Burgos, Qian Cao

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We developed a flexible, high-sensitivity spectrometer using synchronized lasers for ultrafast measurements. This advanced system enables detailed studies of molecular dynamics across various chemical and biological systems.

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Area of Science:

  • Spectroscopy
  • Physical Chemistry
  • Molecular Dynamics

Background:

  • Ultrafast spectroscopy requires high sensitivity and broad wavelength coverage.
  • Existing systems often lack flexibility for diverse applications.

Purpose of the Study:

  • To develop a versatile, high-sensitivity time-resolved infrared and Raman spectrometer.
  • To achieve exceptional experimental flexibility for ultrafast measurements.

Main Methods:

  • Utilized a 10-kHz synchronized dual-arm femtosecond and picosecond laser system.
  • Employed ultrafast high-average-power titanium sapphire lasers and optical parametric amplifiers for UV to mid-infrared tuning.
  • Integrated customized silicon, indium gallium arsenide, and mercury cadmium telluride detectors for sensitive probe intensity monitoring.

Main Results:

  • Achieved high sensitivity capable of measuring absorbance changes of ΔOD ~ 10(-5) in 1 second.
  • Demonstrated system performance for time-resolved infrared, 2D infrared, and femtosecond stimulated Raman spectroscopy.
  • Successfully studied organometallic intermediates, organic excited states, and DNA tertiary structure dynamics.

Conclusions:

  • The developed spectrometer offers exceptional flexibility and high sensitivity for ultrafast spectroscopic studies.
  • The system is suitable for investigating complex dynamics in chemical and biological systems.
  • This advancement provides a powerful tool for molecular dynamics research.