Abstract
Consider two non-degenerate levels of an atom (or molecule) with respective energies E 1 and E 2 in the presence of radiation of a frequency satisfying the Bohr condition
where h is Planck's constant, 6.626 × 10-34 J s. If an atom in the lower energy state |1〉 absorbs a photon of frequency v it may be excited to the upper state |2〉. This process is termed induced absorption or, more generally, simply absorption. The probability per second that an atom will absorb a photon, dP 12/dt, is proportional to the number of photons of energy hv per unit volume, p(v), and is usually expressed as:
where the proportionality constant B 12 is the Einstein coefficient of induced absorption (units J-1 m3 s-2).
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Ashworth, S.H. (2002). Principles of Absorption and Fluorescence. In: Andrews, D.L., Demidov, A.A. (eds) An Introduction to Laser Spectroscopy. Springer, Boston, MA. https://doi.org/10.1007/978-1-4615-0727-7_2
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