Oscillator Strength (or f-value) is a fraction expressing the contribution of Quantum Mechanics to the probability that a particular atom absorbs a photon, thereby increasing its State of Excitation. Each transition has a unique oscillator strength, e.g., that for the Lyman Alpha (Ly-α) transition is 0.416. Absorption Cross Section and Absorption Coefficient are other methods of characterizing the probability of Absorption. They incorporate the oscillator strengths of associated with a medium's chemical constituency, as well as the states of excitation, States of Ionization, etc. |