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Aim: To verify the Hartmann Dispersion Formula and to determine the dissociation energy of I2 molecule using a constant deviation spectrometer. Apparatus.CCD Based Constant Deviation Spectrometer To measure the wavelength of absorption bands of KMnO4 and calculate it's Hartmann's constant. Rydberg's constant. (b) Study of emission spectra of metals using constant deviation spectrometer. 3. (a) Determination of Planck's constant and work Objective: (i) Calibrate the C.D.S using a calibration source (ii) Determine the weave length of the unknown spectra of the given metals in the arc lamp source. Figure 1: (a) Constant Deviation Spectrometer; (b) Constant Deviation Prism. 6.4 THEORY AND FORMULA USED. Hartmann suggested an equation for the wavelength 52 - Constant Deviation Spectrometer This spectrometer is used to analyse the wavelengths of photons emitted by various chemical sources. spectral lines and determine the Rydberg constant The relationship between the scale reading y and the wavelength λ is given by the Hartmann.