Elsawy, Mahmoud Lanteri, Stéphane Duvigneau, Régis Brière, Gauthier Mohamed, Mohamed Sabry Genevet, Patrice

Optimization of the performance of flat optical components, also dubbed metasurfaces, is a crucial step towards their implementation in realistic optical systems. Yet, most of the design techniques, which rely on large parameter search to calculate the optical scattering response of elementary building blocks, do not account for near-field interact...

Ndengue, Steve SCRIBANO, Yohann Gatti, Fabien Dawes, Richard

We present an MCTDH method as an attractive alternative approach to the usual quantum close-coupling method which approaches some computational limits in the calculation of rotational excitation (and deexcitation) between polyatomic molecules (here collisions between triatomic and diatomic rigid molecules). We have perfomed a computational investig...

Bernier, Joackim Casas, Fernando Crouseilles, Nicolas

In this work, a splitting strategy is introduced to approximate two-dimensional rotation motions. Unlike standard approaches based on directional splitting which usually lead to a wrong angular velocity and then to large error, the splitting studied here turns out to be exact in time. Combined with spectral methods, the so-obtained numerical method...

Chartier, Philippe Crouseilles, Nicolas Lemou, Mohammed Méhats, Florian Zhao, Xiaofei

In this paper, we consider the three dimensional Vlasov equation with an inhomo-geneous, varying direction, strong magnetic field. Whenever the magnetic field has constant intensity, the oscillations generated by the stiff term are periodic. The homogenized model is then derived and several state-of-the-art multiscale methods, in combination with t...

Bernier, Joackim Casas, Fernando Crouseilles, Nicolas

In this work, a splitting strategy is introduced to approximate two-dimensional rotation motions. Unlike standard approaches based on directional splitting which usually lead to a wrong angular velocity and then to large error, the splitting studied here turns out to be exact in time. Combined with spectral methods, the so-obtained numerical method...

Chartier, Philippe Crouseilles, Nicolas Lemou, Mohammed Méhats, Florian Zhao, Xiaofei

In this paper, we consider the three dimensional Vlasov equation with an inhomo-geneous, varying direction, strong magnetic field. Whenever the magnetic field has constant intensity, the oscillations generated by the stiff term are periodic. The homogenized model is then derived and several state-of-the-art multiscale methods, in combination with t...

Ndengue, Steve SCRIBANO, Yohann Gatti, Fabien Dawes, Richard

We present an MCTDH method as an attractive alternative approach to the usual quantum close-coupling method which approaches some computational limits in the calculation of rotational excitation (and deexcitation) between polyatomic molecules (here collisions between triatomic and diatomic rigid molecules). We have perfomed a computational investig...

Nesterenok, A. BOSSION, Duncan SCRIBANO, Yohann Lique, Francois

We consider the collisional excitation of H$_2$ molecule in C-type shocks propagating in dense molecular clouds. New data on collisional rate coefficients for the (de-)excitation of H$_2$ molecule in collisions with H atoms and new H$_2$ dissociation rates are used. The new H$_2$--H collisional data are state of the art and are based on the most ac...

Nesterenok, A. BOSSION, Duncan SCRIBANO, Yohann Lique, Francois

We consider the collisional excitation of H$_2$ molecule in C-type shocks propagating in dense molecular clouds. New data on collisional rate coefficients for the (de-)excitation of H$_2$ molecule in collisions with H atoms and new H$_2$ dissociation rates are used. The new H$_2$--H collisional data are state of the art and are based on the most ac...

Gonzalez Lezana, Tomas BOSSION, Duncan SCRIBANO, Yohann Bhowmick, Somnath Suleimanov, Yury

The H + HeH$^+ \rightarrow$ He + H$_2^+$ reaction has been studied by means of a combination of theoretical approaches: a statistical quantum method (SQM), ring polymer molecular dynamics (RPMD) and the quasiclassical trajectory (QCT) method. Cross sections and rate constants have been calculated in an attempt to investigate the dynamics of the pro...