- #1
phzrosmary
- 1
- 0
Hello everyone,
I need some confirmation on something:
As far as I understood, the raman spectroscopy measures the inelastic scattering of a photon in a medium through the absorption or the emission of a phonon in the medium. The energy and the momentum is conserved.
hk_in=hk_out +- hq (1) Momentum conservation
k_in and k_out being the incoming and the scattered wave vector, and q the impuls of the phonon.
q is quantified.
now the difficulty:
why are the phonon taking part in the raman scattering limited to the central region of the first brillouin zone?
what I think:
the incoming photon has a very small wave vector compared to the dimension of the brillouin zone. q is limited to the central region of zone, otherwise q would be bigger than k_in, and that would violate (1). Is it valid? When would you use the quantified phonon as an argument for the confinement of q in the brillouin zone though?
Thank you very much for your help in advance
peace
I need some confirmation on something:
As far as I understood, the raman spectroscopy measures the inelastic scattering of a photon in a medium through the absorption or the emission of a phonon in the medium. The energy and the momentum is conserved.
hk_in=hk_out +- hq (1) Momentum conservation
k_in and k_out being the incoming and the scattered wave vector, and q the impuls of the phonon.
q is quantified.
now the difficulty:
why are the phonon taking part in the raman scattering limited to the central region of the first brillouin zone?
what I think:
the incoming photon has a very small wave vector compared to the dimension of the brillouin zone. q is limited to the central region of zone, otherwise q would be bigger than k_in, and that would violate (1). Is it valid? When would you use the quantified phonon as an argument for the confinement of q in the brillouin zone though?
Thank you very much for your help in advance
peace