ETH-FAST Fellow from May 11 - May 21, 2016

Anthony Starace George Holmes University Professor of Physics University of Nebraska-Lincoln Department of Physics and Astronomy 208 Theodore Jorgensen Hall 855 N 16th St. Lincoln, NE 68588-0299 Tutorial 1: Tuesday 17 May 2016, 16.45 - 19.30pm, HPF G6 Tutorial 2: Wednesday 18 May 2016, 16.45 - 19.30pm, HPF G6

Tutorial Number 1: Atomic Photoionization with Applications to Harmonic Generation and Multiphoton Ionization
Starace Tutorial Lecture 1 (14.11 MB)

Abstract: I will review basic features of atomic photoionization [1,2] and then illustrate how knowledge of atomic photoionization can be employed to interpret and predict features that occur in harmonic generation [3-7] and multiphoton ionization [8, 9].
 
References:
 [1] A.F. Starace, “Theory of Atomic Photoionization,” Handbuch der Physik, Vol. 31, Edited by W. Mehlhorn (Springer-Verlag, Berlin, 1982), pp. 1-121.
[2] S.T. Manson and A.F. Starace, “Photoelectron Angular Distributions: Energy Dependence for s-Subshells,” Rev. Mod. Phys. 54, 389 (1982).
[3] M.V. Frolov, N.L. Manakov, T.S. Sarantseva, M.Yu. Emelin, M.Yu. Ryabikin, and A.F. Starace, “Analytic description of the high-energy plateau in harmonic generation by atoms: Can the harmonic power increase with increasing laser wavelengths?,” Phys. Rev. Lett. 102, 243901 (2009).
[4] M. V. Frolov, N. L. Manakov, and A.F. Starace, “Potential Barrier Effects in High Harmonic Generation by Transition Metal Ions,” Phys. Rev. A 82, 023424 (2010).
[5] J.M. Ngoko Djiokap and A.F. Starace, “Evidence of the 2s2p(¹P) Doubly Excited State in the Harmonic Generation Spectrum of He,” Phys. Rev. A 84, 013404 (2011).
[6] J.M. Ngoko Djiokap and A.F. Starace, “Resonant Enhancement of the Harmonic Generation Spectrum of Beryllium,” Phys. Rev. A 88, 053412 (2013).
[7] M. V. Frolov, T. S. Sarantseva, N. L. Manakov, K. D. Fulfer, B. P. Wilson, J. Troß, X. Ren, E. D. Poliakoff, A. A. Silaev,  N. V. Vvedenskii, A. F. Starace, and C. A. Trallero-Herrero, “Atomic Photoionization Experiment by Harmonic-Generation Spectroscopy,” Phys. Rev. A 93, 031403(R) (2016).
[8] L.-W. Pi and A.F. Starace, “Potential Barrier Effects in Two-Photon Ionization Processes,” Phys. Rev. A 82, 053414 (2010).
[9] L.-W. Pi and A.F. Starace, “Potential Barrier Effects in Three-Photon Ionization Processes,” Phys. Rev. A 90, 023403 (2014).
 

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Tutorial Number 2: Attosecond Physics: Near Future Prospects Starace Tutorial IIa (1.46 MB), Starace Tutorial IIb (6.61 MB)

Abstract: Various experimental groups are aiming to produce isolated, few-cycle attosecond light pulses as well as sub-femtosecond electron pulses.  In this tutorial I will survey some of the new physics that will become possible when these goals are achieved.  Specifically, I will present the theory of attosecond photoionization by few-cycle, carrier-envelope-phase stable attosecond light pulses and then show and discuss the unique features of the predicted ionization spectra produced by such pulses [1-4].  I will then examine reasons why attosecond electron pulses are advantageous for imaging target electronic motion by means of ultrafast electron diffraction (UED), show proof-of-principle calculations illustrating the ability of such pulses to image electronic motion, and discuss the theoretical requirements underlying the ability of UED to image target electronic motions [5-7].
 
References:
 
[1] L.Y. Peng, E.A. Pronin, and A.F.Starace, “Attosecond Pulse Carrier-Envelope Phase Effects on Ionized Electron Momentum and Energy Distributions: Roles of Frequency, Intensity, and an Additional IR Pulse,” New J. Phys. 10, 025030 (2008).
[2] E. A. Pronin, A. F. Starace, M. V. Frolov and N. L. Manakov, “Perturbation Theory Analysis of Attosecond Photoionization,” Phys. Rev. A 80, 063403 (2009).
[3] J.M. Ngoko Djiokap, S.X. Hu, W.-C. Jiang, L.-Y. Peng, and A.F. Starace, “Enhanced Asymmetry in Few-Cycle Attosecond Pulse Ionization of He in the Vicinity of Autoionizing Resonances,” New J. Phys. 14, 095010 (2012). [Published in the Focus Issue on “Correlation Effects in Radiation Fields.”]
[4] J.M. Ngoko Djiokap, S.X. Hu, W.-C. Jiang, L.-Y. Peng, and A.F. Starace, “Asymmetries in Production of He⁺(n=2) with an Intense Few-Cycle Attosecond Pulse,” Phys. Rev. A 88, 011401(R) (2013).
[5] H.-C. Shao and A.F. Starace, “Detecting Electron Motion in Atoms and Molecules,” Phys. Rev. Lett. 105, 263201 (2010).  This work has been highlighted in Physical Review Focus: http://focus.aps.org/story/v26/st25 as well as by NSF: http://go.usa.gov/pwn
[6] H.-C. Shao and A.F. Starace, “Imaging Coherent Electronic Motion in Atoms by Ultrafast Electron Diffraction,” Phys. Rev. A 88, 062711 (2013). This article has been selected by the editors of Physical Review A as an “Editor’s Suggestion.”
[7] H.-C. Shao and A.F. Starace, “Imaging Electronic Motions in Atoms by Energy-Resolved Ultrafast Electron Diffraction,” Phys. Rev. A 90, 032710 (2014).

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