Download PDF by S H Lin: Advances in multi-photon processes and spectroscopy

By S H Lin

This quantity makes a speciality of the new quick progress in either experimental and theoretical experiences of multiphoton tactics and multiphoton spectroscopy of atoms, ions and molecules in chemistry, physics, biology, fabric sciences, and so forth. It comprises papers readable by way of lively researchers and by means of those that intend to go into it. idea and scan are both emphasised, and every assessment article is written in a self-contained demeanour via specialists within the box in order that readers research the topic with out a lot guidance.

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69c) A diagramatic representation of the time evolution of the ket and bra vectors in two-photon transitions is shown in Figs. 2. 2c correspond to the time evolution in Eqs. 69c, respectively. In the case of m = m', that is, neglecting the coherent effects, these diagrams, for example, reduce to those for the resonant light scattering problems investigated by 19 20 21 Takagahara et al, ' and by Hanamura and Takagahara. So far, we have restricted ourselves to the two-photon transition. The rate of three-photon transitions can be taken into account in the similar way.

26b) respectively. In a displaced harmonic oscillator model, an analytical expression in the low temperature limit can be obtained as k (2-seq) _ < 2 I mf- r mm> r ma Tmrn k v I j-0 J k=0 k ! 26c) To illustrate the difference in the vibronic intensity distribution between the simultaneous and sequential twophoton transition, model calculations of the vibronic structures are performed by using the analytical expressions derived above. In Figs. 3. 0 and 0 for Figs. 6. The dephasing 43 constant r = 5.

L} Til J. 24) IT13 An expression for the vibronic intensity distribution of the sequential two-photon absorption in the BornOppenheimer approximation can be derived from Eq. 17). For simplicity, the following approximation is adopted, (io) ,+r ,) mm mm — 6 ,/r , which means neglect of interference & mm mm' effects between the vibronic levels in the resonant state. In this approximation, Eq. 17) can be written as k(2 seq)CT " % ^ wvwv . p(ai0) represent the line shape function of the absorption from the electronic ground state to a single vibronic level m in the resonant state and that from this level to the final electronic state, and they are given by r Vi^l' = I °aa a I | 2 ' A 2 ^r2 A 42 and ,2 / \ v n't' m' r ' I m-*f (a) 2 ) =

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Advances in multi-photon processes and spectroscopy by S H Lin


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