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limitkiller
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why are molecular vibrations never synchronized in a way that would make them macroscopically observable?
limitkiller said:why are molecular vibrations never synchronized in a way that would make them macroscopically observable?
The earliest practical examples of Stimulated Emission was with Microwaves. The MASER came before the LASER and in both cases, waves are produced in synchronism. You do need 'special' conditions for this to happen and it would never happen by chance because of the way the energy levels are naturally populated. It would be interesting to know the lowest frequency of stimulated emission that has been achieved. Probably something to do with thermal activity upsetting the population?limitkiller said:why are molecular vibrations never synchronized in a way that would make them macroscopically observable?
That's not true. E. g., sound waves in solids are synchronised vibrations of the molecules. The term to look for is "collective excitations".limitkiller said:why are molecular vibrations never synchronized in a way that would make them macroscopically observable?
limitkiller said:why are molecular vibrations never synchronized in a way that would make them macroscopically observable?
If we had two magnets swinging on pendulums, I would expect them to synchronize after a while(Right?).mfb said:Why would you expect them to synchronize?
you are right. I was thinking about the vibrations that are due too temperature.ZapperZ said:What makes you think that they are not "synchronized"?
There are "normal modes" of vibrations in solids. And DrDu has pointed out another example.
Your starting premise is faulty. Rather than asking us to explain your faulty starting premise, it is wise to FIRST establish if that premise is true or false.
How so?sophiecentaur said:and it would never happen by chance because of the way the energy levels are naturally populated.
It's a while since I learned about stimulated emission but is it not true to say that a population inversion (necessary for lasing) is not a common natural occurrence?limitkiller said:How so?
Based on friction macroscopic objects have. There is no friction on the level of individual atoms because you can't heat their constituents.limitkiller said:If we had two magnets swinging on pendulums, I would expect them to synchronize after a while(Right?).
Assuming that there was no friction, wouldn't two magnets swinging freely parallel to each other eventually synchronize?mfb said:Based on friction macroscopic objects have. There is no friction on the level of individual atoms because you can't heat their constituents.
Molecular vibration of solids refers to the microscopic movement or oscillation of atoms within a solid material. This movement occurs due to the kinetic energy of the atoms and is responsible for the thermal energy and properties of the solid.
The intensity and frequency of molecular vibration can affect various properties of solids such as thermal expansion, thermal conductivity, and specific heat capacity. It can also influence the mechanical and electrical properties of solids.
The strength of chemical bonds, temperature, and the size and shape of the solid's crystalline structure can influence molecular vibration in solids. Additionally, the presence of impurities or defects in the structure can also affect molecular vibration.
Infrared spectroscopy, Raman spectroscopy, and neutron scattering are commonly used techniques to study molecular vibration in solids. These methods can provide information about the vibrational modes and frequencies of the atoms in a solid material.
The strength of chemical bonds, the arrangement of atoms, and the level of molecular interactions can vary in different types of solids, leading to differences in molecular vibration. For example, molecular vibration in ionic solids is different from that in metallic solids due to the nature of their bonding.