6-1Experiment 6 SPECTROSCOPY I. Learning Objectives… ±To construct a simple but accurate spectroscope containing a built-in quantitative calibration system. ±To use the spectroscope to compare various continuous emission sources.±To obtain the atomic line spectra of light emitted from discharge tubes.±To calculate the photon wavelengths, frequencies, and energies from the line spectra dataII. Background Information Atoms, ions, and molecules contain electrons that occupy discrete energy levels. The actual energy of each state (level) is dependent upon several factors: the nuclear charge, the distance of the electron from the nucleus, and the number of electrons between the nucleus and the electron in question. The transition of an electron from one level to another must be accompanied by the emissionor absorptionof a discrete amount of energy. The magnitude of this energy depends on the energy of each of the levels between which the transition occurs. Figure 6.1. Energy Level Transitions In the instance illustrated above in Figure 3, the energy involved in the electron transition (²E) will equal the energy difference between E2and E1: ²E = E2- E1
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