Question

Question No. 5
Among the following diatomic molecule, the one that shows ESR signal is
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Answer 1

Answer:

Electron paramagnetic resonance (EPR) or electron spin resonance (ESR) spectroscopy is a method for studying materials with unpaired electrons. The basic concepts of EPR are analogous to those of nuclear magnetic resonance (NMR), but it is electron spins that are excited instead of the spins of atomic nuclei. EPR spectroscopy is particularly useful for studying metal complexes or organic radicals. EPR was first observed in Kazan State University by Soviet physicist Yevgeny Zavoisky in 1944,[1][2] and was developed independently at the same time by Brebis Bleaney at the University of Oxford.

Answer 2

Question:

Which molecules will show ESR signal?

Answer:

• ESR spectrum of electron spin resonance is shown by molecules having an unpaired electron or free radical. it is shown by paramagnetic molecules and absent in diamagnetic species. ESR spectrum is shown by NO2, CO2 and NO2.ESR spectroscopy is also called electron paramagnetic resonance (EPR) spectroscopy or electron magnetic resonance spectroscopy.

• NMR is an abbreviation for Nuclear Magnetic Resonance. An proton magnetic resonance instrument permits the molecular structure of a fabric to be analyzed by observant and measurement the interaction of nuclear spins once placed in an exceedingly powerful magnetic field.

• For the analysis of molecular structure at the atomic level, lepton microscopes and X-ray diffraction instruments may be used, however the benefits of NMR are that sample measurements are non-destructive and there's less sample preparation required.

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