Tracing direct and sequential two-photon double ionization of D{sub 2} in femtosecond extreme-ultraviolet laser pulses

Journal Article · Mon Feb 15 00:00:00 EST 2010 · Physical Review. A

DOI:https://doi.org/10.1103/PHYSREVA.81.021401· OSTI ID:21408166

Jiang, Y H; Kurka, M; Kuehnel, K U; Ergler, Th; Schroeter, C D; Moshammer, R ^[1]; Rudenko, A; Foucar, L ^[2]; Plesiat, E; Perez-Torres, J F; Martin, F ^[3]; Herrwerth, O; Lezius, M; Kling, M F ^[4]; Titze, J; Jahnke, T; Doerner, R ^[5]; Sanz-Vicario, J L ^[6]; Schoeffler, M; Tilborg, J van ^[7]

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1. Max-Planck-Institut fuer Kernphysik, D-69117 Heidelberg (Germany)
2. Max-Planck Advanced Study Group at CFEL, D-22607 Hamburg (Germany)
3. Departamento de Quimica C-9, Universidad Autonoma de Madrid, E-28049 Madrid (Spain)
4. Max-Planck-Institut fuer Quantenoptik, D-85748 Garching (Germany)
5. Institut fuer Kernphysik, Universitaet Frankfurt, D-60486 Frankfurt (Germany)
6. Instituto de Fisica, Universidad de Antioquia, Medellin (Colombia)
7. Lawrence Berkeley National Laboratory, Berkeley, California 94720 (United States)

Two-photon double ionization (TPDI) of D{sub 2} is studied for 38-eV photons at the Free Electron Laser in Hamburg (FLASH). Based on model calculations, instantaneous and sequential absorption pathways are identified as separated peaks in the measured D{sup +}+D{sup +} fragment kinetic energy release (KER) spectra. The instantaneous process appears at high KER, corresponding to ionization at the molecule's equilibrium distance, in contrast to sequential ionization mainly leading to low-KER contributions. Measured fragment angular distributions are in good agreement with theory.

• OSTI ID: 21408166
• Journal Information: Physical Review. A, Vol. 81, Issue 2; Other Information: DOI: 10.1103/PhysRevA.81.021401; (c) 2010 The American Physical Society; ISSN 1050-2947
• Country of Publication: United States
• Language: English

Related Subjects

74 ATOMIC AND MOLECULAR PHYSICS
ANGULAR DISTRIBUTION
DEUTERIUM IONS
EQUILIBRIUM
EV RANGE 10-100
EXTREME ULTRAVIOLET RADIATION
FREE ELECTRON LASERS
IONIZATION
KINETIC ENERGY
MOLECULES
PEAKS
PHOTONS
PULSES
SPECTRA
BOSONS
CHARGED PARTICLES
DISTRIBUTION
ELECTROMAGNETIC RADIATION
ELEMENTARY PARTICLES
ENERGY
ENERGY RANGE
EV RANGE
IONS
LASERS
MASSLESS PARTICLES
RADIATIONS
ULTRAVIOLET RADIATION