Моделювання зіткнення літаків з використанням методики істотних вибірок

We introduce the model of movement of two conflicting aircrafts and state the problem, we apply the importance sampling technique and elaborate an algorithm of collision modeling based on normal distributions, a small simulation studyРассмотрена модель движения двух конфликтующих самолетов. Предложены методика важных выборок и алгоритм моделирования столкновения самолетов, основанный на нормальном распределенииРозглянуто модель руху двох конфліктуючих літаків. Запропоновано методику істотних вибірок і алгоритм моделювання зіткнення літаків, заснований на нормальному розподіл

Attosecond electron spectroscopy using a novel interferometric pump-probe technique

We present an interferometric pump-probe technique for the characterization of attosecond electron wave packets (WPs) that uses a free WP as a reference to measure a bound WP. We demonstrate our method by exciting helium atoms using an attosecond pulse with a bandwidth centered near the ionization threshold, thus creating both a bound and a free WP simultaneously. After a variable delay, the bound WP is ionized by a few-cycle infrared laser precisely synchronized to the original attosecond pulse. By measuring the delay-dependent photoelectron spectrum we obtain an interferogram that contains both quantum beats as well as multi-path interference. Analysis of the interferogram allows us to determine the bound WP components with a spectral resolution much better than the inverse of the attosecond pulse duration.Comment: 5 pages, 4 figure

Incorporating real time velocity map image reconstruction into closed-loop coherent control

We report techniques developed to utilize three-dimensional momentum information as feedback in adaptive femtosecond control of molecular dynamics. Velocity map imaging is used to obtain the three-dimensional momentum map of the dissociating ions following interaction with a shaped intense ultrafast laser pulse. In order to recover robust feedback information, however, the two-dimensional momentum projection from the detector must be inverted to reconstruct the full three-dimensional momentum of the photofragments. These methods are typically slow or require manual inputs and are therefore accomplished offline after the images have been obtained. Using an algorithm based upon an “onion-peeling” (also known as “back projection”) method, we are able to invert 1040 × 1054 pixel images in under 1 s. This rapid inversion allows the full photofragment momentum to be used as feedback in a closed-loop adaptive control scheme, in which a genetic algorithm tailors an ultrafast laser pulse to optimize a specific outcome. Examples of three-dimensional velocity map image based control applied to strong-field dissociation of CO and O2 are presented

Above-threshold ionization of diatomic molecules by few-cycle laser pulses

Above-threshold ionization of diatomic molecules bu few-cycle laser pulse

Attosecond control of electron localization in one- and two-color dissociative ionization of H2 and D2

We report experiments where an attosecond pulse launches a wavepacket on the dissociative state of D2 +, and a few-cycle IR pulse localizes the electron on one ionic fragment with attosecond sensitivity to the XUV-IR delay

Attosecond control of electron localization in one- and two-color dissociative ionization of H2 and D2

none17ISBN 978-3-540-95945-8 ed. by P. Corkum, S. De Silvestri, JK.A. Nelson, E. Riedle, R.W. SchoenleinG. Sansone; F. Kelkensberg; M.F. Kling; W.K. Siu; O. Ghafur; P. Johnsson; S. Zherebtsov; I. Znakovskaya; T. Uphues; E. Benedetti; F. Ferrari; F. Lepine; M. Swoboda; T. Remetter; A. L'Huillier; M. Nisoli; M.J.J. VrakkingSansone, Giuseppe; F., Kelkensberg; M. F., Kling; W. K., Siu; O., Ghafur; P., Johnsson; S., Zherebtsov; I., Znakovskaya; T., Uphues; Benedetti, Enrico; Ferrari, Federico; F., Lepine; M., Swoboda; T., Remetter; A., L'Huillier; Nisoli, Mauro; M. J. J., Vrakkin