Do you know the meaning of the Zero phonon or phonon-assisted?

In summary, Zero phonon refers to the absence of lattice excitation during emission and absorption, also known as the Mössbauer effect. This allows for information on hyperfine interactions or energy levels to be obtained. Phonon-assisted scattering, on the other hand, involves the presence of side bands in addition to the zero phonon peak, which can provide information on phonon density of states. This can be observed through techniques such as nuclear inelastic scattering, nuclear resonance vibrational spectroscopy, and nuclear resonant inelastic X-ray scattering. The first experiments on phonon-assisted Mössbauer effect were conducted in 1985 and the first NIS side band spectrum was published in 1995 with the help of syn
  • #1
proandphy
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Do you know the meaning of the Zero phonon or phonon-assisted?
 
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  • #2


phonon-assisted ... what?

phohon-assisted scattering, tunneling, ..?

also what is the context of zero phonon?
 
  • #3


Zero phonon: during emission and absorbtion there is no lattice excitation (Mössbauer effect)-here information on the hyperfine interactions (or n=0 so E=hv/2).
Phonon assisted:together with zero phonon, there will be side bands. These side bands are assisted by Mössbauer effect. Here you get information on phonon density of states..
these informations can be obtained from nuclear inelastic scattering-NIS (a.k.a. nuclear inelastic absorption, nuclear resonance vibrational spectroscopy-NRVS, phonon assisted Mössbauer effect, Nuclear resonant inelastic X-ray scattering-NRIXS).
Just try for find some quantum book, or a Mössbauer book..you will get all info there.
PS: Mössbauer effect discovered in 1957, Theorists predicted that there will be phonon assisted Mössbauer effect (side bands) in 1960, after first experiments in 1985, first NIS side band spectrum published in 1995 (help of synchrotron sources).
 
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1. What is a phonon?

A phonon is a quantized unit of vibrational energy in a solid material. It is similar to a photon in that it carries energy and can interact with other particles, but it is associated with vibrational or acoustic energy instead of electromagnetic energy.

2. What is the zero phonon line?

The zero phonon line (ZPL) is a spectral line in the emission or absorption spectrum of a material that corresponds to a transition between two energy levels where no phonons are involved. This means that the energy of the emitted or absorbed photon matches exactly with the energy difference between the two levels, without any additional energy being lost or gained due to phonon interactions.

3. What is the significance of the zero phonon line?

The presence or absence of a zero phonon line in a material's spectrum can provide information about the material's crystal structure, defects, and interactions with its surroundings. It is also important in the study of quantum phenomena, such as fluorescence and phosphorescence, where the absence of phonon interactions can result in longer emission lifetimes.

4. What is phonon-assisted emission or absorption?

Phonon-assisted emission or absorption occurs when a phonon is involved in the transition between two energy levels in a material's spectrum. This means that the energy of the emitted or absorbed photon does not exactly match the energy difference between the levels, but is instead slightly higher or lower due to the energy of the involved phonon. This type of transition is more common than zero phonon transitions.

5. How is the presence of phonons detected in a material's spectrum?

The presence of phonons can be detected through various techniques, such as Raman spectroscopy, which measures the scattering of light by phonons in a material. Additionally, the shape and width of spectral lines can provide information about the phonon interactions in a material, as phonon-assisted transitions tend to result in broader lines compared to zero phonon transitions.

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