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Absorption and Fluorescence

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An Introduction to Laser Spectroscopy

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Abstract

Consider two non-degenerate levels of an atom (or molecule) with respective energies E1 and E2 in the presence of radiation of a frequency satisfying the Bohr condition

$$ \nu = ({{E}_{2}} - {{E}_{1}})/hv, $$
(1)

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, dP12/dt, is proportional to the number of photons of energy by per unit volume, ρ(v), and is usually expressed as:

$$ \frac{{d{{P}_{{12}}}}}{{dt}} = {{\operatorname{B} }_{{12}}}\rho \left( v \right), $$
(2)

where the proportionality constant B12 is the Einstein coefficient of induced absorption (units J−1 m3 s−2).

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Authors and Affiliations

  1. School of Chemistry, University of Bristol, Bristol, BS8 1TS, UK

    Michael N. R. Ashfold

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  1. Michael N. R. Ashfold
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Editors and Affiliations

  1. University of East Anglia, Norwich, England

    David L. Andrews  & Andrey A. Demidov  & 

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© 1995 Plenum Press, New York

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Ashfold, M.N.R. (1995). Absorption and Fluorescence. In: Andrews, D.L., Demidov, A.A. (eds) An Introduction to Laser Spectroscopy. Springer, Boston, MA. https://doi.org/10.1007/978-1-4613-0337-4_3

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  • DOI: https://doi.org/10.1007/978-1-4613-0337-4_3

  • Publisher Name: Springer, Boston, MA

  • Print ISBN: 978-1-4613-8004-7

  • Online ISBN: 978-1-4613-0337-4

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