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Related Concept Videos

Other Nuclides: 31P, 19F, 15N NMR01:16

Other Nuclides: 31P, 19F, 15N NMR

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Many organic, inorganic, and biological molecules contain spin-half nuclei such as nitrogen-15, fluorine-19, and phosphorus-31. As a result, NMR studies of these nuclei have found extensive applications in chemical and biological research.
While fluorine-19 and phosphorous-31 have high natural abundances (100%) and positive gyromagnetic ratios, nitrogen-15 has a low natural abundance and a negative gyromagnetic ratio. However, nitrogen-15 is still preferred over nitrogen-14 (which has a...
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Mass Spectrometry: Isotope Effect

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Most elements exist in nature as a mixture of isotopes. The isotopes differ in weight due to their respective number of neutrons. The molecular weight of a molecule is different depending on the specific isotope of its elements involved. As a result, the mass spectrum of the molecule exhibits peaks from the same fragment at multiple positions. The positions of these mass signals depend on the difference between the molecular mass. Furthermore, the intensity of these signals is dependent on the...
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Isotopes and Radioisotopes

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In the early 1900s, English chemist Frederick Soddy realized that an element could have atoms with different masses that were chemically indistinguishable. These different types are called isotopes — atoms of the same element that differ in mass. Isotopes differ in mass because they have different numbers of neutrons but are chemically identical because they have the same number of protons. Soddy was awarded the Nobel Prize in Chemistry in 1921 for this discovery.
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NMR Spectroscopy: Chemical Shift Overview01:15

NMR Spectroscopy: Chemical Shift Overview

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The position of the absorption signal of a sample is reported relative to the position of the signal of tetramethylsilane (TMS), which is added as an internal reference while recording spectra. The difference between the absorption frequencies of the sample and TMS (in Hz) is divided by the spectrometer operating frequency (in MHz) to obtain a dimensionless quantity called the chemical shift. It is reported on the δ (delta) scale and expressed in parts per million.
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Raman Spectroscopy: Overview01:20

Raman Spectroscopy: Overview

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The underlying principle of Raman spectroscopy is based on the interaction between light and matter, specifically molecules' inelastic scattering of photons. When a monochromatic beam of light, typically from a laser source, interacts with a sample, most scattered light has the same frequency as the incident light. This is known as Rayleigh scattering.
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Radioactivity and Nuclear Equations

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Nuclear chemistry is the study of reactions that involve changes in nuclear structure. The nucleus of an atom is composed of protons and, except for hydrogen, neutrons. The number of protons in the nucleus is called the atomic number (Z) of the element, and the sum of the number of protons and the number of neutrons is the mass number (A). Atoms with the same atomic number but different mass numbers are isotopes of the same element.
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Isotope Shifts of Radium Monofluoride Molecules.

S M Udrescu1, A J Brinson1, R F Garcia Ruiz1,2

  • 1Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA.

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Radium monofluoride (RaF) molecules reveal significant isotope shifts, providing a sensitive probe of nuclear size effects. This study validates theoretical models and opens avenues for nuclear structure research.

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Area of Science:

  • Atomic and Molecular Physics
  • Nuclear Physics
  • Quantum Chemistry

Background:

  • Isotope shifts in molecules offer insights into nuclear properties.
  • Radium monofluoride (RaF) is a promising system for studying nuclear size effects due to the high-Z nature of Radium.
  • Understanding nuclear charge distribution is crucial for nuclear structure models.

Purpose of the Study:

  • To measure isotope shifts of RaF for various isotopes and vibrational levels.
  • To investigate the sensitivity of RaF to nuclear size effects.
  • To test ab initio quantum chemical calculations against experimental data.

Main Methods:

  • High-precision spectroscopic measurements of isotope shifts in RaF.
  • Experimental determination of vibrational level energies.
  • Ab initio quantum chemical calculations of electronic structure and properties.

Main Results:

  • Observed significant isotope shifts for ^{223-226,228}Ra^{19}F across different vibrational levels.
  • Demonstrated high sensitivity of RaF to nuclear size effects.
  • Excellent agreement between experimental measurements and theoretical calculations.

Conclusions:

  • RaF is a highly sensitive probe for nuclear structure studies.
  • The results provide stringent tests for models of nuclear electronic density.
  • Short-lived molecules like RaF offer unique opportunities for fundamental symmetry tests.