Résumé. 2014 La description de la fluorescence de résonance par la méthode de l’atome habillé est généralisée pour inclure les effets collisionnels. Ces effets s’interprètent comme une modification par les collisions de la cascade radiative de l’atome habillé. Toutes les caractéristiques des spectres d’absorption et d’émission sont exprimées en fonction des paramètres de relaxation, de type T1 et T2, de l’atome habillé. On analyse le domaine de validité de cette approche et on montre qu’il est plus large que celui des équations de Bloch optiques. Les paramètres de relaxation sont reliés à la matrice S de collision. En utilisant une représentation de spin, on les met également sous la forme de transformées de Fourier d’une fonction de corrélation de la perturbation collisionnelle. Abstract. 2014 The dressed atom approach to resonance fluorescence is extended to include collisional effects. These effects appear as a collision induced modification of the radiative cascade of the dressed atom. All the cha-racteristics of absorption and emission spectra are expressed in terms of the T1 and T2 type relaxation para-meters of the dressed atom. The domain of validity of this approach is investigated and is shown to be larger than that of the optical Bloch equations. The relaxation parameters are related to the collision S matrix. By using a spin representation, they are also expressed in terms of the Fourier transform of some correlation function of the collisional perturbation.Résumé. 2014 La description de la fluorescence de résonance par la méthode de l’atome habillé est généralisée pour inclure les effets collisionnels. Ces effets s’interprètent comme une modification par les collisions de la cascade radiative de l’atome habillé. Toutes les caractéristiques des spectres d’absorption et d’émission sont exprimées en fonction des paramètres de relaxation, de type T1 et T2, de l’atome habillé. On analyse le domaine de validité de cette approche et on montre qu’il est plus large que celui des équations de Bloch optiques. Les paramètres de relaxation sont reliés à la matrice S de collision. En utilisant une représentation de spin, on les met également sous la forme de transformées de Fourier d’une fonction de corrélation de la perturbation collisionnelle. Abstract. 2014 The dressed atom approach to resonance fluorescence is extended to include collisional effects. These effects appear as a collision induced modification of the radiative cascade of the dressed atom. All the cha-racteristics of absorption and emission spectra are expressed in terms of the T1 and T2 type relaxation para-meters of the dressed atom. The domain of validity of this approach is investigated and is shown to be larger than that of the optical Bloch equations. The relaxation parameters are related to the collision S matrix. By using a spin representation, they are also expressed in terms of the Fourier transform of some correlation function of the collisional perturbation.

Journal de physiqueJan 1, 198253 citations

Photon Correlation of Correlated Photons

John Rarity, P. R. Tapster

Springer eBooksJan 1, 19970 citations

Collisional perturbations of time-resolved photon scattering from molecular levels

Shaul Mukamel, A. Ben‐Reuven, Joshua Jortner

A theoretical study is presented of the effects of collisional perturbations on the time-resolved resonant and near-resonant photon scattering from a molecular system. The photon counting rate is formulated in terms of tetradic Green's functions in Liouville space. The collisional and radiative damping effects are handled by an effective-Liouvillian formalism. The formal expressions are disentangled by invoking a series of successive approximations, assuming short correlation times of the thermal bath, neglecting relaxation processes in the ground electronic state, considering rotational relaxation as providing the dominant damping mechanism in the excited electronic manifold, specializing to weak electromagnetic fields, neglecting some off-resonance processes and disregarding collision-induced radiative processes. The photon counting rate is expressed as a triple convolution of the photon counting rate for the free molecule with the Doppler Gaussian profile and with a Lorentz profile. The latter incorporates purely collisional effects due to intrastate cross relaxations and proper ${T}_{2}$ processes. The theory accounts well for the recent experimental data of Williams, Rousseau, and Dworetsky on collisionally perturbed ${\mathrm{I}}_{2}$ molecules.A theoretical study is presented of the effects of collisional perturbations on the time-resolved resonant and near-resonant photon scattering from a molecular system. The photon counting rate is formulated in terms of tetradic Green's functions in Liouville space. The collisional and radiative damping effects are handled by an effective-Liouvillian formalism. The formal expressions are disentangled by invoking a series of successive approximations, assuming short correlation times of the thermal bath, neglecting relaxation processes in the ground electronic state, considering rotational relaxation as providing the dominant damping mechanism in the excited electronic manifold, specializing to weak electromagnetic fields, neglecting some off-resonance processes and disregarding collision-induced radiative processes. The photon counting rate is expressed as a triple convolution of the photon counting rate for the free molecule with the Doppler Gaussian profile and with a Lorentz profile. The latter incorporates purely collisional effects due to intrastate cross relaxations and proper ${T}_{2}$ processes. The theory accounts well for the recent experimental data of Williams, Rousseau, and Dworetsky on collisionally perturbed ${\mathrm{I}}_{2}$ molecules.

Physical Review ASep 1, 197571 citations

Quantum physics for correlated photons

Augusto Garuccio

Vistas in AstronomyJan 1, 19933 citations

{T}_{2}

processes. The theory accounts well for the recent experimental data of Williams, Rousseau, and Dworetsky on collisionally perturbed

{\mathrm{I}}_{2}

molecules.