Peak width: Defined as the full width at half maximum (FWHM), it depends on the coherency of vibration and is influenced by temperature and disorder. Very similar to XRD diffraction peaks, a Raman peak will be broader at higher temperatures and in the presence of disorder. Crystalline samples...
Moreover, both electron donors and electron acceptors broaden the G band and increase the FWHM of the G mode. Sign in to download hi-res image Figure 4.36. Raman G-band shifts of bare graphene due to interactions with several concentrations of tetrathiafulvalene (TTF) and tetracyanoethylene (...
17.A laser device, comprising:(a) at least one laser beam generating module that outputs at least one first laser beam having:a beam quality factor (M2) between 1 and 5, anda spectral width of less than 0.15 nm (FWHM),wherein the at least one laser beam generating module comprises at ...
We have also performed the measurements of the full width at half maximum (FWHM), which was found to increase with the distance from the source. This behavior may be explained by spectral diffusion, a well-known phenomenon in long-distance Raman measurements.34 It stands to reason that the ...
There are two spectral resolutions to consider in REM, the Raman spectral resolution (x-axis) and the excitation spectral resolution (y-axis). The spectral resolution can be estimated with a spectral line which is narrower than the resolution. The full width at half maximum (FWHM) of G band...
(the X-Y plane) diffraction limited resolution of the microscope due to the convolution of the excitation PSF with the pinhole aperture. There are several ways to define the lateral resolution but the most useful when comparing conventional and confocal microscopes is the FWHM of the effective ...
2016). Raman scattering cross-sections for these molecules under UV are of the order of 10−25 cm2 sr−1, meaning that a detectable Raman spectrum can be obtained with a relatively low-power laser, even when the aromatic organic material is at low concentration (Asher and Murtaugh ...
(the X-Y plane) diffraction limited resolution of the microscope due to the convolution of the excitation PSF with the pinhole aperture. There are several ways to define the lateral resolution but the most useful when comparing conventional and confocal microscopes is the FWHM of the effective ...
(FWHM) linewidths, Eqn. (5), all depend on the ratio of the phonon to electron velocity in the inner and outer scattering processes. We use the results from the two laser lines to find the shift with laser energy33,∂ω/∂EL, of the2D1and 2D2band for “pristine” and charged ...
This result was expected because the Raman spectra results did not show significant deviations in FWHM and Raman shift. Therefore, it is possible that even if there is a small contamination, it would not significantly alter the Raman spectrum. Some samples exhibited higher concentrations of carbon ...