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Excitation of superpositions of resonances by two time-delayed ultrafast pulses: Multistate semianalytic formalism and application to inner-hole states of carbon at the K absorption edge

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Excitation of superpositions of resonances by two time-delayed ultrafast pulses: Multistate semianalytic formalism and application to inner-hole states of carbon at the K absorption edge
Νικολαΐδης, Κλεάνθης A.
Κομνηνός, Γιάννης
Μερκούρης, Θεόδωρος Δ.
Άρθρο σε επιστημονικό περιοδικό
2020
We construct and solve semianalytically a pump-probe problem which is defined by an excitation-coupling scheme that engages superpositions of resonance states. The scheme is |0 » →a t t o secp u l s e ω1 w e a k (superposition of resonances ) ↔m o d e r a t e l y s t r o n g f e m t o secp u l s e ω2 (superposition of resonances ) where |0 » is a discrete state. The resonance wave functions are treated rigorously as stationary states in the continuous spectrum. They are energy-normalized and are expressed as linear combinations of localized and scattering components, using the formalism of Fano. The attosecond and femtosecond pulses have central frequencies ω1 and ω2, with ω1≫ω2 . They are applied with positive (the short XUV pulse peaks after the second pulse) or negative (the short XUV pulse peaks before the second pulse) time delay, tD. The theory is time-dependent and involves many-electron wave functions and matrix elements. Its computational implementation is extremely economic. The application which is reported here treats the excitation of a core-excited superposition of valence-Rydberg autoionizing states of carbon near the K -absorption edge by a weak 100 as Gaussian pulse, and their coupling to a higher-lying core-excited autoionizing Rydberg state by an 80 fs Gaussian pulse of intensities of order 1012W /c m2 . State-specific N -electron correlated wave functions are used. A number of concrete findings are obtained, demonstrating a variety of channel-dependent photoelectron spectra as functions of the pulse parameters and of the time delay, tD.
Φυσική και θεωρητική χημεία (EL)
Φυσική (EL)
Ατομική φυσική (συμπ. μοριακή φυσική, σχετικότητα, κβαντική θεωρία και φυσική στερεάς κατάστασης) (EL)
Atomic physics (Incl. molecular physics, relativity, quantum theory, and solid state physics) (EN)
Physical and theoretical chemistry (EN)
Physics (EN)
Ultrafast phenomena (EN)
Atomic, Molecular and Optical (EN)
Atomic and molecular processes in external fields (EN)
English
American Physical Society
Physical Review A
Copyright © 2020 American Physical Society
https://creativecommons.org/licenses/by/4.0/deed.el
National Hellenic Research Foundation (NHRF)
Helios - Repository of the National Hellenic Research Foundation (NHRF)



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