The study of external perturbation to the Raman modes is very novel and well understood. For example, pressure and temperature effects on solid are given below.
Pressure effects:
1. The applied pressure reduces the lattice parameters and consequently increases the bond strength. So frequency of Raman mode increases and its FWHM increases (due to quantum mechanical uncertainty principle).
Temperature Effects:
1. The temperature (high) increases the lattice parameter and consequently decreases the bond strength. So Raman mode frequency decreases and FWHM increases.
Similarly, I like to understand the effect on electric field in Raman mode frequency and its FWHM.
What will be the effect of electric field on phonon frequency and its lifetime (Full Width at Half Maximum)?
Dear Rajaji,
I think if you are talking about the external electric field strength......
It will not affect the frequency of the phonon modes but definitely it will affect the strength of Raman signal...
In this context one should Remember the SERS and TERS effect to enhance the Raman signal....
with the help of plasmonics, we can enhance the electric field strength and hence the Raman signal also......
Some reference are available, which reports, With the help of plasmonic enhancement (TERS) they observed some forbidden Raman modes which we can't observe using Normal Raman Spectra.....
I cannot answer your specific question, but want to draw your attention to the fact that investigation of (static) electric field influence on Raman scattering was investigated already some 40 years ago
Article Measurement of Raman Scattering in High Field Electric Strength
Article Measurement of Raman Scattering in Simple Liquids under the ...
Article Static Field Dependence of the Raman Polarizability Demonstr...
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