Dissociative ionization of H{sub 2} in an attosecond pulse train and delayed laser pulse

Journal Article · Sat May 15 00:00:00 EDT 2010 · Physical Review. A

DOI:https://doi.org/10.1103/PHYSREVA.81.053413· OSTI ID:21408850

Feng, He; Thumm, Uwe ^[1]

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1. James R. Macdonald Laboratory, Kansas State University, Manhattan, Kansas 66506-2604 (United States)

The ionization of H{sub 2} in a single attosecond extreme ultraviolet (XUV) pulse generates a nuclear wave packet in H{sub 2}{sup +}, which is entangled with the emitted photoelectron wave packet. The nuclear wave-packet dynamics can be observed by dissociating H{sub 2}{sup +} in a delayed IR laser pulse. If H{sub 2} is ionized by a sequence of XUV pulses of an attosecond pulse train, whether or not the corresponding sequence of nuclear wave packets in H{sub 2}{sup +} is detected as a coherent or incoherent superposition depends on whether and how the photoelectrons are observed. We simulate the nuclear dynamics in this XUV-pump-IR-probe scenario and analyze our numerical results for both single attosecond pump pulses and pump-pulse trains of different lengths and temporal spacings between individual XUV pulses. By superimposing nuclear wave packets in H{sub 2}{sup +} generated by individual pulses in the pump-pulse train incoherently, we calculate proton kinetic energy release spectra that are in good qualitative agreement with the recent experiment of Kelkensberg et al. [Phys. Rev. Lett. 103, 123005 (2009)].

• OSTI ID: 21408850
• Journal Information: Physical Review. A, Vol. 81, Issue 5; Other Information: DOI: 10.1103/PhysRevA.81.053413; (c) 2010 The American Physical Society; ISSN 1050-2947
• Country of Publication: United States
• Language: English

Related Subjects

74 ATOMIC AND MOLECULAR PHYSICS
EXTREME ULTRAVIOLET RADIATION
HYDROGEN
HYDROGEN IONS 2 PLUS
IONIZATION
KINETIC ENERGY
LASERS
PROBES
PROTONS
PULSES
QUANTUM ENTANGLEMENT
SPECTRA
WAVE PACKETS
BARYONS
CATIONS
CHARGED PARTICLES
ELECTROMAGNETIC RADIATION
ELEMENTARY PARTICLES
ELEMENTS
ENERGY
FERMIONS
HADRONS
HYDROGEN IONS
IONS
MOLECULAR IONS
NONMETALS
NUCLEONS
RADIATIONS
ULTRAVIOLET RADIATION