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陈浩南
2025-05-26 17:38:00 +08:00
parent e53d62668b
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test-typst/section/perfect/non-polar/default.typ
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@@ -63,14 +63,15 @@ The E#sub[1] mode calculated at 746.91 cm#super[-1] (mode 7)
are predicted to have much weaker Raman intensities and are located close to the most intense mode (mode 8),
making them indistinguishable in experimental spectra.
Additionally, the A#sub[1] mode calculated at 812.87 cm#super[-1] (mode 10)
exhibits very weak Raman intensity in the configuration polarized in the basal-plane (xx and yy, only 0.01)
but an observable intensity in the configuration polarized along z-axis (1.78).
exhibits a very weak Raman intensity in the basal-plane polarized configurations (xx and yy, only 0.01)
but shows an observable intensity when the polarization is along the z-axis (1.78).
Since most Raman experiments are performed in a back-scattering configuration with light incident along the z-direction
(polarized in-plane)
with photon energies much lower than the band gap,
this mode is generally not observed (cite).
However, it should become detectable when the incident light have z-direction polarization part (as in our experiment)
or when the incident light wavelength is near resonance conditions (cite).
(i.e., with in-plane polarization)
and with photon energies much lower than the band gap,
this mode is typically not observed (cite).
However, it should become detectable if the incident light has a polarization component along the z-direction
(as in our experiment),
or when the excitation wavelength approaches resonance conditions (cite).
Besides, there are other peeks in the experiment.
The peek at 796 and 980 are caused by strong-polar phonons which will be discussed later.