Recent content by AlKindi

Yes, in fact in many publication is write "restrahlen" with reststrahlen I find much more. Thanks a lot!

I search it on google, books, articles, everyone cite it but no one explain fully what it is. If you can: bibliography please! Thanks a lot!

Thanks a lot Born2bwire, you solve me a great doubt. So if I'm a spectroscopist I know that I can't obtain any information from the Fresnel reflection, but does the amount of Fresnel reflection varies if are involved absorption phenomena?

When a ray interacts with a solid if the surface is polished reflection occurs. This is true even if the material absorbs at the specific wave lenght? In other words if the material absorbs at the specific λ, can occurs Fresnel reflection ? Or: Fresnel reflection has always all the same λs of...

Ok, I will learn more about intersecting potential energy surface. Thanks.

Thanks. So you esclude all the other phenomena, don't you think that the molecule could however behave as a different molecule? Could the molecule absorbs other photons? The final question maybe is: could the molecule do many process in the same time? Thanks.

Ok, I was asking to myself, if a molecule/atom in a excited state could be treat as the same molecule/atom in a ground state: can the first have different optical proprieties, be trasparent absorbs in other region etc. etc.

Yes a photon that can normaly be absorb when the molecule/atom is in the ground state (the same wavelenght or a another wavelenght).

What's happen when a molecule or an atom is already in an excited electronic state and is hit from another photon? Example 1: my molecule absorbs a VIS photon (there's a time in which the molecule is an upper electronic state before the re-emission or etc. etc. process) what happen if another...

I think when a photon (and the wave associeted) interact costructively with a system there is a time in which the photon "lose its identity" (e.g. the 10-5 seconds for the fluorescence) the energy is non more in the photon but in the system e.g. molecule. So we can say that it is re-emitted...

Thanks Claude, but what's about Resonace Raman scattering are there any virtual electronic states involve? I don't think so... [Modern Raman Spectroscopy– A Practical Approach p. 94]

Thanks, I think a lot of work can be made in determining this sort of change!

If the fluorescence is the re-emitting of a photon with a larger wave length due to the transition from a higher energy state to a lower energy state in the case of resonance Raman (where there aren't any virtual states) seems be equal to the fluorescence. Which differences are there?

Thanks, so is "simply" a change of the electronic structure. So when something can change the electronic structure? I mean, does the chemical matrix, the surrounding "molecular environment", can affect the electronic structure or must be a more strength bond like a ion bond?

Okay, maybe they act both together. I'm sure some polymorphic form of quinacridones are due to differents overlaps of the main structure that reinforce the dipole transition depending on the way in which they are set. Thank's a lot! P.S. Can I calculate, predict in some way this interaction?