Usage

Unit conversion

When modifying the laser wavelength, the Raman shifts are left unchanged except for the wavelength shift. When modifying the Raman shift or the absolute position, the laser wavelength is left unchanged. The other values are updated accordingly. Approximate colors are shown using this javascript code.

Rubis pressure gauge ^*

Choose a laser wavelength in the corresponding box. ω₀ (the Raman shift for the ruby line at P=0) is updated according to the position of the R1 line (694.24 nm). But you can modify it to take into account experimental uncertainties. Then you can either modify the pressure P or the Raman shift of the rubis line ω to calculate the other value.

Raman thermometer

The ratio of the Stokes and anti-Stokes Raman peak intensities is recalculated when the temperature is modified. Alternatively you can change the ratio and the temperature is calculated. To enter the ratio, you can use expressions such as 12345/6789. When the laser wavelength or the Raman shift change, the ratio is updated. Calculations are performed using the following relation with n= 3 (photon counting) 4 (power) : $\frac{I_{\mathrm{Stokes}}}{I_{\mathrm{anti-Stokes}}}={\left(\frac{{\nu }_{\mathrm{Stokes}}}{{\nu }_{\mathrm{anti-Stokes}}}\right)}^n.e^{\frac{\hslash {\omega }_{\mathrm{vibration}}}{k_{B}T}}$