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By John N. Dodd

This publication discusses the interplay of sunshine with atoms, focusing on the semiclassical descriptions of the approaches. It starts off by way of discussing the classical conception of electromagnetic radiation and its interplay with a classical charged dipole oscillator. Then, in a pivotal bankruptcy, the interplay with a unfastened cost is defined (the Compton effect); it really is proven that, so as to supply contract with remark, yes quantum ideas needs to be brought. The e-book then proceeds to debate the interplay from this aspect of view-light constantly being defined classically, atoms defined quantum-mechanically, with quantum ideas for the interplay. next chapters take care of motivated emission and absorption, spontaneous emission and rot, the overall challenge of sunshine stimulating and being scattered from the two-state atom, the photoelectric influence, and photoelectric counting facts. eventually the writer supplies a private view at the nature of sunshine and his personal method of convinced paradoxes. The writing of this e-book used to be initially conceived as a collaboration among the current writer and a colleague of former years, Alan V. Durrant. certainly, a few initial trade of rules happened within the mid-1970s. however the difficulties of joint-authorship from antipodean positions proved too tough and the undertaking used to be deserted. i want to list my indebted­ ness to him for the stimulation of this early organization. I additionally recognize the encouragement of my colleagues on the Univer­ sity of Otago. specific reference needs to be made to D. M.

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Extra resources for Atoms and Light: Interactions

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It is appropriate at this point to expand the analysis to the broad-band case. 5) may be generalized to where the frequency component in the infinitesimal frequency window dv 20 CHAPTER 3 at the frequency v has amplitude E(v) dv and phase q1(v}. 17) [It is often the case that the Fourier transform is defined in terms of the angular frequency rather than the frequency. One then has to face the problem of where to place the factor of 21T. An advantage of using frequency is that this problem is avoided.

It remains for us to establish an expression for s( v) and to justify Eq. 23). The energy density in the field is given by Eq. 2), u(t) = e 0 E(t) · E(t). The method of expanding this over frequency, and of performing a time average over an interval T, is discussed in Appendix 1. The result is given in general by Eq. ll): where the amplitude function 5£(j, T) and the phase function ,\(f) have forms that depend on how the averaging over time is performed; here they are written as Lorentzian, implying that exponential averaging has been used.

The methods by which this is carried out are discussed in Appendix 1. We shall be concerned only with the steady-state result which is achieved by taking the averaging period, or the integration time constant T to approach infinity. The result is = J+oo 0 d 2 2( ) . 22) The first factor in the integrand is the spectral intensity, the power per unit area per unit frequency interval. It is shown in Appendix 1, Eqs. 19) that s(v) = lim E(v). 24) a result that is to be compared with Eq. 12) for a monochromatic wave.

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