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About: Ionization is a(n) research topic. Over the lifetime, 67763 publication(s) have been published within this topic receiving 1376985 citation(s). The topic is also known as: ionisation. more


Open accessJournal ArticleDOI: 10.1103/PHYSREVLETT.71.1994
Paul B. Corkum1Institutions (1)
Abstract: During strong-field multiphoton ionization, a wave packet is formed each time the laser field passes its maximum value Within the first laser period after ionization there is a significant probability that the electron will return to the vicinity of the ion with very high kinetic energy High-harmonic generation, multiphoton two-electron ejection, and very high energy above-threshold-ionization electrons are all conssequences of this electron-ion interaction One important parameter which determines the strength of these effects is the rate at which the wave packet spreads in the direction perpendicular to the laser electric field; another is the polarization of the laser It will be essential for experimentalists to be aware of these crucial parameters in future experiments more

Topics: Double ionization (61%), Ionization (61%), Photoionization (60%) more

4,891 Citations

Journal ArticleDOI: 10.1063/1.475855
Abstract: This paper presents an evaluation of the performance of time-dependent density-functional response theory (TD-DFRT) for the calculation of high-lying bound electronic excitation energies of molecules. TD-DFRT excitation energies are reported for a large number of states for each of four molecules: N2, CO, CH2O, and C2H4. In contrast to the good results obtained for low-lying states within the time-dependent local density approximation (TDLDA), there is a marked deterioration of the results for high-lying bound states. This is manifested as a collapse of the states above the TDLDA ionization threshold, which is at ??HOMOLDA (the negative of the highest occupied molecular orbital energy in the LDA). The ??HOMOLDA is much lower than the true ionization potential because the LDA exchange-correlation potential has the wrong asymptotic behavior. For this reason, the excitation energies were also calculated using the asymptotically correct potential of van Leeuwen and Baerends (LB94) in the self-consistent field step. This was found to correct the collapse of the high-lying states that was observed with the LDA. Nevertheless, further improvement of the functional is desirable. For low-lying states the asymptotic behavior of the exchange-correlation potential is not critical and the LDA potential does remarkably well. We propose criteria delineating for which states the TDLDA can be expected to be used without serious impact from the incorrect asymptotic behavior of the LDA potential more

Topics: Local-density approximation (55%), Bound state (53%), Ionization (51%) more

4,187 Citations

Open accessJournal ArticleDOI: 10.1038/S41467-018-07882-8
Maksim Kunitski1, Nicolas Eicke2, Pia Huber1, Jonas Köhler1  +12 moreInstitutions (2)
Abstract: Wave-particle duality is an inherent peculiarity of the quantum world. The double-slit experiment has been frequently used for understanding different aspects of this fundamental concept. The occurrence of interference rests on the lack of which-way information and on the absence of decoherence mechanisms, which could scramble the wave fronts. Here, we report on the observation of two-center interference in the molecular-frame photoelectron momentum distribution upon ionization of the neon dimer by a strong laser field. Postselection of ions, which are measured in coincidence with electrons, allows choosing the symmetry of the residual ion, leading to observation of both, gerade and ungerade, types of interference. more

Topics: Ionization (55%), Neon (54%)

4,138 Citations

Journal ArticleDOI: 10.1063/1.447218
Abstract: We model, in an elementary way, the excited electronic states of semiconductor crystallites sufficiently small (∼50 A diam) that the electronic properties differ from those of bulk materials. In this limit the excited states and ionization processes assume a molecular‐like character. However, diffraction of bonding electrons by the periodic lattice potential remains of paramount importance in the crystallite electronic structure. Schrodinger’s equation is solved at the same level of approximation as used in the analysis of bulk crystalline electron‐hole states (Wannier excitons). Kinetic energy is treated by the effective mass approximation, and the potential energy is due to high frequency dielectric solvation by atomic core electrons. An approximate formula is given for the lowest excited electronic state energy. This expression is dependent upon bulk electronic properties, and contains no adjustable parameters. The optical f number for absorption and emission is also considered. The same model is applied to the problem of two conduction band electrons in a small crystallite, in order to understand how the redox potential of excess electrons depends upon crystallite size. more

Topics: Core electron (61%), Electronic structure (60%), Electron hole (59%) more

4,069 Citations

Open accessJournal ArticleDOI: 10.1038/NCOMMS4460
Taras Palasyuk1, I. A. Troyan1, Mikhail Eremets1, Vadym Drozd2  +7 moreInstitutions (3)
Abstract: Ionization of highly compressed ammonia has previously been predicted by computation. Here, the authors provide experimental evidence for this autoionization process at high pressures, showing the transformation of molecular ammonia into ammonium amide. more

Topics: Chemical ionization (59%), Ionization (55%), Ammonia (54%) more

3,629 Citations

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Topic's top 5 most impactful authors

Joachim Ullrich

175 papers, 7K citations

Igor Bray

167 papers, 3.5K citations

Lorenz S. Cederbaum

135 papers, 5.7K citations

Reinhard Dörner

134 papers, 9.5K citations

Tilmann D. Märk

128 papers, 3.8K citations

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