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