Erratum: Complete photo-fragmentation of the deuterium molecule

Weber, Thorsten; Czasch, A.; Jagutzki, O.; Müller, Andreas; Mergel, V.; Kheifets, Anatoli; Rotenberg, Eli; Meigs, G.; Prior, M. H.; Daveau, S.; Landers, A. L.; Cocke, C. L.; Osipov, T.; Muiño, R. Dı́ez; Schmidt‐Böcking, H.; Dörner, R.

doi:10.1038/nature05296

Cited by 20 publications

(19 citation statements)

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“…Indeed, in the independent electron model, the double ionization probability is zero, which is the consequence of both the exact orthogonality of the atomic or molecular orbitals and the one-body character of the dipole operator. For the case of H 2 , the simplest molecular target, double photoionization (DPI) is accompanied by a Coulomb explosion of the nuclei, and recent momentum imaging experiments [1][2][3][4] in which all four charged particles are measured in coincidence have shown that the correlated motion of the ejected electrons is sensitive to the kinetic energy release (KER) of the dissociating nuclei. The KER, as we verify below, is directly related to the internuclear separation of the target at the moment of photon absorption via the relation KER 1=R.…”

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confidence: 99%

Role of Nuclear Motion in Double Ionization of Molecular Hydrogen by a Single Photon

Vanroose

Rescigno

et al. 2007

Phys. Rev. Lett.

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We examine the origin of recently observed variations with internuclear distance (R) of the fully differential cross sections for double ionization of aligned H2 by absorption of a single photon. Using the results of fully converged numerical solutions of the Schrödinger equation, we show that these variations arise primarily from pronounced differences in the R dependence of the parallel and perpendicular components of the ionization amplitude. We also predict that R dependences should be readily observable in the asymmetry parameter for photodouble ionization, even in experimental measurements that are not differential in the energy sharings between ejected photoelectrons.

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confidence: 99%

Role of Nuclear Motion in Double Ionization of Molecular Hydrogen by a Single Photon

Vanroose

Rescigno

et al. 2007

Phys. Rev. Lett.

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“…The effect is most apparent in the full 3D plots. As Weber et al [72] point out, in the analogous atomic case of helium the light field apparently drives electrons towards a dipole pattern keyed to the axis of polarization, whereas in the geometry of the experiment shown in Fig. 3 the molecule emits the in-plane electron strongly perpendicular to its axis.…”

Section: Double Photoionization Of Hmentioning

confidence: 97%

“…Experiments in which both electrons are ejected from an oriented hydrogen molecule by absorption of a single photon are currently available [9,[71][72][73]. Among the latter, Weber et al [9,72] have recently demonstrated that the ejection pattern of the electrons depends sensitively on the bond distance between the two nuclei as they vibrate in their ground state.…”

Section: Double Photoionization Of Hmentioning

confidence: 99%

“…Among the latter, Weber et al [9,72] have recently demonstrated that the ejection pattern of the electrons depends sensitively on the bond distance between the two nuclei as they vibrate in their ground state. In the experiments, linearly polarized 75 eV synchrotron radiation was used to study single-photon induced fragmentation of molecular deuterium.…”

Section: Double Photoionization Of Hmentioning

confidence: 99%

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Molecular ionization and dissociation using synchrotron radiation and ultrashort laser pulses

Martín¹

2007

J. Phys.: Conf. Ser.

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Abstract. An overview of recent theoretical progress to accurately describe non dissociative and dissociative ionization of molecules exposed to synchrotron radiation and ultrashort uv/xuv laser pulses is presented. The success of recent theoretical approaches rely on their ability to account for both the electronic and nuclear degrees of freedom. This is essential to describe the delicate interplay between the electronic motion and the molecule's vibration, especially in those cases where ionization occurs in a time scale comparable to that of the vibrational motion. Some of the most successful applications and the new physics that has emerged by comparing with recent kinematically complete experiments on H2 and D2 will be discussed. IntroductionMolecular ionization is one of the most elementary processes that occurs in the upper atmosphere [1] and in interstellar molecular clouds [2]. Since in molecules the absorbed energy is shared between electronic and nuclear degrees of freedom, the remaining molecular ion can be left in an excited vibrational or dissociative state. This is at variance with atomic ionization where the energy is entirely absorbed by the electrons. In early pictures of molecular ionization, the nuclear motion was either ignored or described in terms of the Franck-Condon (FC) approximation, in which electronic processes occurring at the equilibrium position of the nuclei are weighted by the squared overlap between the initial and final vibrational states. With the advent of kinematically complete experiments [3,4], in which the momenta of all charged particles is determined, new phenomena with an intrinsic molecular origin have been discovered (see, e.g., [5][6][7][8][9][10][11]). Also the above pictures have been revealed to be incomplete. In this manuscript, the important role of nuclear dynamics in molecular ionization produced by synchrotron radiation and ultrashort pulses will be demonstrated by means of recent ab initio theoretical calculations that account for all electronic and vibrational degrees of freedom.In particular, recent results for electron angular distributions from fixed-in-space molecules will be analyzed and compared with kinematically complete photoionization experiments using synchrotron radiation. These include double and single photoionization of H 2 (D 2 ). The range of excess photon energies considered goes from a few to several hundreds of eV. Also, multiphoton ionization of molecules by vuv ultrashort pulses will be discussed. In particular, the new physics that can be expected by varying pulse duration and intensity will be analyzed.

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“…This work demonstrates that attosecond coherent control methods can manipulate double ionization processes on attosecond time scales, where electron-electron interactions play an important role. Double photoionization is a fundamental mechanism where a single photon can ionize two electrons simultaneously from an atom, providing insight into electron/electron dynamical correlation processes [25][26][27][28]. Understanding and coherently controlling these correlations in simple atoms and molecules, where theoretical models are possible, will help develop the more advanced concepts necessary to control ultrafast dynamics in complex molecular systems [29] or novel, strongly-correlated materials [30].…”

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confidence: 99%