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Related Concept Videos

Atomic Emission Spectroscopy: Overview01:20

Atomic Emission Spectroscopy: Overview

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...
Inductively Coupled Plasma Atomic Emission Spectroscopy: Principle01:19

Inductively Coupled Plasma Atomic Emission Spectroscopy: Principle

Inductively coupled plasma (ICP) is the most widely used plasma source in atomic emission spectroscopy (AES), also known as Inductively Coupled Plasma Optical Emission Spectroscopy (ICP-OES). The ICP source, or torch, consists of three concentric quartz tubes with argon gas flowing through them. A spark from a Tesla coil initiates the ionization of argon, generating a high-temperature plasma.
The ions and electrons produced interact with the fluctuating magnetic field created by a water-cooled...
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,...
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.
Atomic Absorption Spectroscopy: Radiation and Light Sources01:13

Atomic Absorption Spectroscopy: Radiation and Light Sources

Atomic absorption spectroscopy (AAS) relies on the Beer-Lambert law, which requires that the radiation source emits a narrow range of wavelengths to match the absorption characteristics of the analyte atom. The primary criteria for choosing an appropriate radiation source in AAS is to provide a precise and intense emission at specific wavelengths that will allow accurate detection of the analyte.
Two common narrow-range 'line' sources used in AAS are hollow-cathode lamps (HCLs) and...
Atomic Emission Spectroscopy: Lab01:29

Atomic Emission Spectroscopy: Lab

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...

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Applying X-ray Imaging Crystal Spectroscopy for Use as a High Temperature Plasma Diagnostic
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Terahertz pulse radiation from argon clusters.

Takeshi Nagashima1, Heijiro Hirayama, Kyoji Shibuya

  • 1Institute of Laser Engineering, Osaka University, 2-6 Yamadaoka, Suita, Osaka 565-0871, Japan. nagasima@ile.osaka-u.ac.jp

Optics Express
|May 26, 2009
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Summary

Intense femtosecond laser pulses interacting with argon clusters generate significantly enhanced terahertz (THz) pulse radiation. This amplified THz emission, 40x greater than from argon gas, results from increased laser absorption by the clusters.

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Area of Science:

  • Physics
  • Laser-Plasma Interactions
  • Terahertz (THz) Science

Background:

  • Terahertz (THz) pulse radiation is crucial for various scientific and technological applications.
  • Understanding THz generation mechanisms is key to optimizing sources.
  • Argon clusters offer unique properties for laser-matter interactions.

Purpose of the Study:

  • To investigate the characteristics of THz pulse radiation emitted from argon clusters irradiated by intense femtosecond laser pulses.
  • To compare THz radiation efficiency between argon clusters and argon gas.
  • To elucidate the underlying physical mechanisms responsible for THz generation in argon clusters.

Main Methods:

  • Irradiation of argon clusters with intense femtosecond laser pulses.
  • Measurement of THz pulse power, polarization state, and angular distribution.
  • Comparison with THz radiation from argon gas under similar conditions.

Main Results:

  • Argon clusters produced THz pulses with approximately 40 times greater average power compared to argon gas.
  • Enhanced THz radiation is attributed to significantly larger laser energy absorption by the argon clusters.
  • The polarization state and angular distribution of THz pulses were independent of the laser polarization.

Conclusions:

  • Laser-induced charge separation along the laser propagation direction is the suggested origin of the observed THz radiation.
  • Argon clusters represent a highly efficient medium for generating intense THz pulses using femtosecond lasers.
  • The findings pave the way for developing more powerful and efficient THz sources.