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Rubidium is a very reactive alcali metal of the first group of the table of elements. It was first discovered by Bunsen and Kirchhoff in 1861 using spectroscopic investigations. Due to its typical red color of the spectral lines it was named after the Latin word 'rubidus' (darkred). It is characterized by one valence electron. The natural abundance of Rubidium isotopes is 85Rb(72.2%) and 87Rb(27.8%).
The spectra show the saturated absoption of the D1 line of Rubidium at 780nm. The spectra are detected with a continuous scan with a Sacher Lasertechnik tunable diode laser system.