Raman Tools
Converter: Raman shift ↔ wavelength
A Raman spectrum is described in terms of shift (cm⁻¹) relative to the laser, but the detector „sees" wavelength (nm). This converter calculates one from the other for any laser. Enter a number in one field — the other will be calculated automatically.
Select excitation laser
Simple converter: nm ↔ cm⁻¹ (absolute)
Without laser — pure conversion of wavelength to absolute wavenumber and vice versa (ν̃ = 10⁷ / λ).
Photon energy and spectral units
Converter for light of a given wavelength: photon energy and equivalent units. Enter one value — the rest will be calculated automatically. Note: these are absolute values (wavelength / photon energy), not Raman shift.
Spectrally does this. Want to measure your compound with a selected laser — in the lab or directly on the line? Let's discuss your case.
How it works — formula and why it matters
Raman is measured as a shift in energy relative to the laser, not as an absolute wavelength. Thus, the same peak (e.g., 1000 cm⁻¹ for an aromatic ring) appears at the same spectral position regardless of the laser used — making it easier to compare with correlation tables.
Δν̃ [cm⁻¹] = 10⁷ · ( 1/λ₀[nm] − 1/λ[nm] )
λ_stokes [nm] = 10⁷ / ( 10⁷/λ₀ − Δν̃ )
λ₀ — laser wavelength, λ — scattered light wavelength, Δν̃ — Raman shift. The Stokes side (Δν̃ > 0) corresponds to light with a longer wavelength than the laser; the anti-Stokes side lies symmetrically at shorter wavelengths.
Practical application: check whether your peak falls within the detector range, select an edge filter, or compare measurements from two different lasers.
Have a sample you don’t want to guess about?
We conduct feasibility studies even on the most challenging samples — on your material, at your site. Leave your contact, and we will review your case and tell you directly whether Spectrally can measure it.
