optical phonon sentence in Hindi
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- When measuring optical phonon energy by experiment, optical phonon frequencies are sometimes given in spectroscopic wavenumber notation, where the symbol " ? " represents ordinary frequency ( not angular frequency ), and is expressed in units of units of energy for more details and uses.
- When measuring optical phonon energy by experiment, optical phonon frequencies are sometimes given in spectroscopic wavenumber notation, where the symbol " ? " represents ordinary frequency ( not angular frequency ), and is expressed in units of units of energy for more details and uses.
- Many models of phonon thermal transport ignores the effects of transverse acoustic phonons ( TA ) at high frequency due to their small group velocity . ( Optical phonon contributions are also ignored for the same reason . ) However, upper branch of TA phonons have non-zero group velocity at the Brillouin zone boundary along the ?-? direction and, in fact, behave similarly to the longitudinal acoustic phonons ( LA ) and can contribute to the heat transport.
- The band gap of various semiconductors and semimetals . As outlined above, an efficient pV cell requires a material with an optical phonon mode more energetic than the bandgap, which in turn is much more energetic than the thermal energy at the intended operating temperature ( E _ { p, \ mathrm { O } } \ simeq \ Delta E _ { e, g } \ gg k _ \ mathrm { B } T _ \ mathrm { pV } ).
- Early on, while working on optical phonon lifetimes, the basis for his doctoral thesis, he accidentally discovered the white-light supercontinuum laser . " I thought there was something wrong with the experiment, " he said . " For three months I worked to find the source of my error, because what I was seeing just didn't seem possible . " He jokes that he used up a lot of black masking tape trying to seal the spectrograph that he assumed was leaking light.
- In general, a material with a first-row element is required to have a highly energetic optical phonon, e . g ., greater than 100 meV . For example, the carbon allotropes ( diamond, graphene, and graphite ) or boron nitride allotropes produce optical phonon modes exceeding 150 meV . However, the high electronegativity of a first-row elements tends to create a very large band gap, as in diamond and the boron nitride allotropes ( band gaps greater than 3 eV ), unless they are sufficiently symmetric, like graphene ( no band gap)
- In general, a material with a first-row element is required to have a highly energetic optical phonon, e . g ., greater than 100 meV . For example, the carbon allotropes ( diamond, graphene, and graphite ) or boron nitride allotropes produce optical phonon modes exceeding 150 meV . However, the high electronegativity of a first-row elements tends to create a very large band gap, as in diamond and the boron nitride allotropes ( band gaps greater than 3 eV ), unless they are sufficiently symmetric, like graphene ( no band gap)
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