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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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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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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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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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Preparing an Isotopically Pure 229Th Ion Beam for Studies of 229mTh
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Laser-based conversion electron Mössbauer spectroscopy of 229ThO2.

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Researchers demonstrated laser-induced conversion electron Mössbauer spectroscopy (CEMS) for the Thorium-229 (²²⁹Th) nuclear isomer. This breakthrough enables nuclear clock development using materials previously unsuitable for VUV spectroscopy.

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Area of Science:

  • Nuclear Physics and Spectroscopy
  • Condensed Matter Physics
  • Metrology

Background:

  • The Thorium-229 (²²⁹Th) nuclear isomeric state offers potential for nuclear clocks and fundamental physics tests.
  • Current methods for studying the ²²⁹Th isomer in solids require high-bandgap materials, limiting applications.
  • Laser Mössbauer spectroscopy offers high sensitivity for probing nuclear environments and developing sensors.

Purpose of the Study:

  • To demonstrate a new technique for probing the ²²⁹Th nuclear isomeric state in a solid host.
  • To overcome the limitations of vacuum ultraviolet (VUV) transmissive host materials in previous studies.
  • To explore the potential for developing a conversion-electron-based nuclear clock.

Main Methods:

  • Demonstration of laser-induced conversion electron Mössbauer spectroscopy (CEMS) on a thin Thorium dioxide (ThO₂) sample.
  • Utilized a ThO₂ sample with a bandgap (approx. 6 eV) significantly smaller than the ²²⁹Th isomeric transition energy (8.4 eV).
  • This method is an alternative to fluorescence spectroscopy, which is incompatible with lower-bandgap materials.

Main Results:

  • Successfully performed CEMS on the ²²⁹Th isomer within ThO₂.
  • The technique is compatible with materials having bandgaps smaller than the nuclear transition energy.
  • This expands the range of host materials suitable for studying the ²²⁹Th isomer.

Conclusions:

  • Laser-induced CEMS provides a viable method for studying the ²²⁹Th isomer in lower-bandgap materials.
  • This opens new avenues for developing highly sensitive solid-state nuclear clocks and sensors.
  • The findings pave the way for a new generation of ²²⁹Th-based metrology and fundamental physics research.