Предраг Ранитовић

07. септембра 2018.

У оквиру семинара Лабораторије за спектроскопију плазме и ласере, у понедељак, 10. септембра 2018. године у 13:30 часова у читаоници библиотеке „Др Драган Поповић“, Предраг Ранитовић ће одржати предавање:

Attosecond Coherent Control of Atomic and Molecular XUV and X-Ray
Absorption Processes by Intense Laser Radiation


Recent breakthroughs in the ultrafast lasers development have allowed for the opening of new horizons in the ultrafast experimental and theoretical AMO physics. Following these advances, table-top light sources have provided novel ways to achieve a real-time manipulation of the correlated electron/nuclear wavepacket dynamics by means of attosecond XUV and femtosecond IR radiation [1-6]. However, more than fifteen years upon the birth of attosecond physics, and after the Nobel Prize Award for femtochemistry, the concept of attosecond chemistry has not yet been fully realized. In this talk, I will introduce the basic principles of the strong laser-field ionization and generation of attosecond XUV/X-Ray radiation, and show how the attosecond VUV and XUV light sources can be used to coherently manipulate molecular dynamics by means of electron wave packet interferometry [7-9]. The use of attosecond VUV pulse-trains to coherently excite and control the outcome of a simple chemical reaction in a deuterium molecule, in a nonBorn-Oppenheimer regime, presents intriguing new possibilities for bridging the gap between the attosecond physics and attochemistry [10]. Furthermore, I will discuss very recent results that extend the use of the attosecond table-top techniques to the soft X-Ray regime in the water window [11].

[1] E. Gagnon, P. Ranitovic, X. M. Tong et al. Science 317(5843), 1374-1378 (2007).
[2] A. S. Sandhu, E. Gagnon, R. Santra, et al. Science 322 (5904), 1081-1085 (2008).
[3] P. Ranitovic, X. M. Tong, B. Gramkow et al. New Journal of Physics 12, 013008 (2010).
[4] D. Hickstain, P. Ranitoivc, S. Witte et al. Phys. Rev. Lett. 109, 073004 (2012).
[5] P. Ranitovic, X. M. Tong, C. W. Hogle et al. Phys. Rev. Lett. 106, 053002 (2011).
[6] X. Zhou, P. Ranitovic, C. W. Hogle et al. Nature Physics 8, 232-237 (2012).
[7] P. Ranitovic, X. M. Tong, C. W Hogle et al. Phys. Rev. Lett. 106, 193008 (2011).
[8] C. Hogle, X. M. Tong, L. Martin, M. M. Murnane, H. C. Kapteyn and P. Ranitovic. Phys. Rev. Letters 115 (17), 173004 (2015).
[9] P. Ranitovic et al. Phys. Rev A, 98 (1), 013410 (2018).
[10] P. Ranitovic et al. Proceedings of National Academy of Sciences, 111(3), pp. 912-917 (2014).
[11] Yoann Pertot, et al. Science 355, 6322 (2017).

Short Biography: Predrag Ranitovic got his PhD from University of Stockholm. His thesis was based on the experimental work performed at Kansas State University where he developed experiments for 3D momentum imaging of small atoms and molecules by attosecond XUV radiation. He continued developing methods for attosecond coherent control of electron and molecular dynamics in the Kapteyn-Murnane group
at University of Colorado and JILA at Boulder. At JILA, he also performed electron holography experiments by utilizing strong mid-IR laser radiation. After UC-Boulder, he moved to Lawrence Berkeley National Lab where he was applying time-resolved femtosecond IR and attosecond XUV methods to coherently control electron dynamics in nano-materials. During his stay at LBNL he was a group leader at ELI-ALPS – the first
large-scale laser user facility currently built in EU. Presently, Predrag is on sabbatical as a senior scientist at ETH – Zurich, and an LBNL affiliate.