By John N. Dodd
This publication discusses the interplay of sunshine with atoms, targeting the semiclassical descriptions of the techniques. It starts off by way of discussing the classical concept 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's proven that, so that it will provide contract with remark, convinced quantum ideas needs to be brought. The e-book then proceeds to debate the interplay from this element of view-light continuously being defined classically, atoms defined quantum-mechanically, with quantum ideas for the interplay. next chapters take care of inspired emission and absorption, spontaneous emission and rot, the overall challenge of sunshine stimulating and being scattered from the two-state atom, the photoelectric impact, and photoelectric counting records. eventually the writer offers a private view at the nature of sunshine and his personal approach of taking a look at definite paradoxes. The writing of this ebook was once initially conceived as a collaboration among the current writer and a colleague of former years, Alan V. Durrant. certainly, a few initial alternate of rules happened within the mid-1970s. however the difficulties of joint-authorship from antipodean positions proved too tricky and the venture was once deserted. i need 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. exact reference has to be made to D. M.
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Extra resources for Atoms and Light: Interactions
It is therefore appropriate to retain a classical description for this simplest of all interactions between an electromagnetic field and matter and to avoid the presumption, as is made in so many text books, that the Compton effect can only be treated by a quantum model of radiation. It may of course yet prove necessary to quantize the radiation, but, at the moment, we have achieved an agreement between experiment and theory by using a classical description. The consequence of requiring that the states of the system before, during, and after interaction shall be stationary states has led to the above stated quantum rules for interaction.
9) which relates the spectral intensity s( v, t) to the spectral energy density (p(v, t))r. The residual time dependence of s(v, t) and I(t) vanish as the time-averaging interval T is extended to infinity; they are then written as steady-state quantities s(v) and I as in Eqs. 24), respectively. 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.
Temporarily, until we link with more well-known terminology in physics, we shall refer to this as a "tantum" of the electromagnetic field, an amount of energy and momentum extracted from the field in order to effect a change in the energy and momentum of the particle with which it is interacting. The description of momentum and energy interchange between the initial steady state before interaction and the new steady state after interaction is illustrated in the top four boxes of Fig. 8. In the top row the particle motion is shown in the incident state (before interaction), and in the second row it is shown in the interaction state (after interaction); the left-hand column depicts the situation in the L frame, and the right-hand column depicts the situation in the ZM frame.