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Units conversion for spectrum representation

Wavelength, Wavenumber, Frequency and Photon Energy Conversion                                    The x-axis of a spectrum should be scaled in frequencies (in Hertz). The frequency representation is dedicated to applications such as measurements of atomic and molecular transitions, heterodyne spectroscopy or TeraHertz generation. The optical frequencies are so large (from 400 to 750 TeraHertz in the visible range) that it is common to use wavelengths in micrometers…