CHM311H5 Study Guide - Midterm Guide: Electron Excitation, Photon, Spectroscopy
Document Summary
Absorption energy of photon promotes an electron from ground state mo to an excited state m. o. Fluorescence excited mo relaxes to ground state mo releasing energy as photon. Electronic transitions between atomic orbitals (ao) also occur. Atomic absorption energy of photon promotes an electron from ground state ao to an excited state. Atomic emission excited ao relaxes to ground state ao releasing energy as photon. However, to measure these molecules, first break them down into their constituent molecules. Advantages of aa: most atoms are in ground state, therefore, providing more transitions to investigate. Flame source are not sufficient enough to provide enough electron excitation and emission providing low background. Signal intensity is proportional to number of atoms in ground state. Since, n0 approximately to ntotal, absorption can be directly related to concentration of element of sample. Need to know profile of every sample under study at different temperatures.