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Optics Communications

Complete solution of the free-space spontaneous emission problem in non-relativistic quantum electrodynamics

JOSIP SEKE

Published May 1, 1993• 3 citations
Publisher
DOI
10.1016/0030-4018(93)90714-g

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The spontaneous fluorescence emission rate (the Einstein rate) from an isolated molecule A is changed by non-identical neighbours of species B, as in vapour phase mixtures, liquid solutions or solids. In this paper the underlying pairwise A–B interactions are analysed in their effect on the rate of emission by A. The effects are reported for all separation distances using non-relativistic quantum electrodynamics with full account of retardation. The Einstein rate for molecule A in isolation is taken as standard. For short A–B distances the two larger changes are due to a reduction in the transition moment after wavefunction renormalization and to the change in emission frequency, i.e., the spectral shift, usually a red shift. Other important changes include some emission by the ‘passive’ molecule B, and a change in the emission rate of A through its coupling to B, even before the change in transition moment is brought in. A novel feature is that the emission by B induced by one-photon exchange between A a...

Molecular Physics•Jun 1, 1996•4 citations
This paper presents a unified pedagogical derivation of the hydrogen atom spectrum and radiative transition structure by organizing three historically separate frameworks into a single mathematical chain: Schrödinger’s non-relativistic wave mechanics, Sommerfeld’s relativistic fine-structure theory, and Maxwell’s classical electrodynamics. The analysis shows how Bohr energy levels arise as the non-relativistic bound-state limit, how Sommerfeld-type fine structure appears when relativistic corrections are included, and how Maxwell radiation theory connects naturally to photon emission rates through transition dipole moments and spontaneous decay constants. The completed framework is advanced by adding the necessary modern ingredients of spin, Lorentz covariance, minimal electromagnetic coupling, and field quantization. With these additions, the chain reaches the Dirac equation coupled to the quantized electromagnetic field, the standard foundation of quantum electrodynamics. The resulting Scretching Master Equation is presented as a structured bridge from introductory quantum mechanics to QED, linking energy eigenvalues, angular-frequency scaling, transition dipole strength μ², spontaneous emission Γ = A₂₁, lifetime τ, and photon radiation into one coherent derivational system.
The spontaneous fluorescence emission rate (the Einstein rate) from an isolated molecule A is changed by non-identical neighbours of species B, as in vapour phase mixtures, liquid solutions or solids. In this paper the underlying pairwise A–B interactions are analysed in their effect on the rate of emission by A. The effects are reported for all separation distances using non-relativistic quantum electrodynamics with full account of retardation. The Einstein rate for molecule A in isolation is taken as standard. For short A–B distances the two larger changes are due to a reduction in the transition moment after wavefunction renormalization and to the change in emission frequency, i.e., the spectral shift, usually a red shift. Other important changes include some emission by the ‘passive’ molecule B, and a change in the emission rate of A through its coupling to B, even before the change in transition moment is brought in. A novel feature is that the emission by B induced by one-photon exchange between A a...