Raman Spectroscopy & Vibrational Mode Analysis
Principles of inelastic Raman photon scattering, lattice phonon characterization, 2D material layer diagnostics, and laser wavelength selection.
Scientific Principles & Procedural Takeaways
Graphene & Carbon: D band (~1350 cm-1) for defects, G band (~1580 cm-1) for graphitic sp2, 2D band (~2690 cm-1) for layer count.
MoS2 & TMDs: E2g and A1g peak separation identifies monolayer vs few-layer flakes.
Laser Selection: 532 nm gives maximum scattering; 785 nm minimizes fluorescence in dyed or biological matrices.
Settings & Acquisition Nuances
Excitation laser wavelength (532 nm vs 785 nm), laser power (<1 mW to prevent heating), objective numerical aperture.
Common Artifacts & Prevention
Autofluorescence background masking subtle Raman peaks. Switch to 785 nm or run baseline polynomial deconvolution.
📥 Starter Practice Datasets
Example Practice Data: Raman Carbon D/G Bands (CSV)
Pedagogical starter ASCII dataset containing wavenumber (1000 - 1800 cm⁻¹) vs intensity counts with baseline offset for practicing deconvolution workflows.