Dissociation of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mmultiscripts><mml:mi mathvariant="normal">H</mml:mi><mml:mn>2</mml:mn><mml:none /><mml:none /><mml:mo>+</mml:mo></mml:mmultiscripts></mml:math>in intense femtosecond laser fields studied by coincidence three-dimensional momentum imaging

Wang, Pengqian; Sayler, A. M.; Carnes, K. D.; Xia, Jiangfan; Smith, Mark A.; Esry, B. D.; Ben‐Itzhak, I.

doi:10.1103/physreva.74.043411

Cited by 87 publications

(78 citation statements)

References 47 publications

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“…Most of the relevant investigations have chosen the Gaussian white noise as the added noise field and there are no reports on the color noise source so far. Moreover, all these theoretical investigations have employed BornOppenheimer (BO) approximation that separates the slow nuclear motion (fs scale) from the fast electronic motion (as scale) [24,25]. However, it is hard to get more accurate results when these separated treatments for the electronic and nuclear degrees of freedom are implemented in practice.…”

Section: Introductionmentioning

confidence: 99%

Intensity enhancement in the molecular ionization and dissociation dynamics in the presence of noise

Feng

Chu

2012

J Mol Model

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The ionization and the dissociation of the diatomic molecular ion H 2 + have been investigated within a scheme where a noise field is added to an intense infrared laser field. The results show that both the ionization and the dissociation probabilities are enhanced with the introduction of the additional noise (the Gaussian white noise or the color noise) field. Further, by tuning the noise intensity and the delay time between the laser and the noise, a stochastic resonancelike curve is observed for the ionization or the dissociation dynamics, showing the existence of an optimal noise intensity and delay time for the given laser field.

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Section: Introductionmentioning

confidence: 99%

Intensity enhancement in the molecular ionization and dissociation dynamics in the presence of noise

Feng

Chu

2012

J Mol Model

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“…A more simplistic picture for understanding the emergence of the double-peaked spectrum can be found in the no-rotation model [1,22]. Specifically, with no rotation of the nuclei and only parallel transitions included, only the effective field E eff = E 0 cos θ 0 enters the dipole interaction.…”

Section: B Alignment Angle Dependencementioning

confidence: 99%

Influence of the initial angular distribution on strong-field molecular dissociation

Zeng

Hernández

et al. 2016

Phys. Rev. A

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We study few-cycle, strong-field dissociation of aligned H + 2 by solving the time-dependent Schrödinger equation including rotation. We examine the dependence of the final angular distribution, the kinetic energy release spectrum, and the total dissociation yield on the initial nuclear angular distribution. In particular, we look at the dependence on the relative angle θ 0 between the laser polarization and the symmetry axis of a well-aligned initial distribution, as well as the dependence on the delay between the "pump" pulse that prepares the alignment and the few-cycle probe pulse. Surprisingly, we find the dissociation probability for θ 0 = 90• can be appreciable even though the transitions involved are purely parallel. We therefore address the limits of the commonly held "ball-and-stick" picture for molecules in intense fields as well as the validity of the axial recoil approximation.

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“…Numerical solutions seeking to include the vibrational motion have only been obtained by reducing the dimensionality of the problem [49,50]. Very recently, the full dimensionality of the electronic and vibrational problem has been taken into account by performing a close-coupling expansion of the time-dependent molecular wave function Φ(r, R, t) [51][52][53][54][55][56][57][58][59][60] (this is at variance with previous applications of the time-dependent close-coupling method within the fixed-nuclei approximation [61,62]). In this method, Φ(r, R, t) is expanded in the basis of stationary vibronic states Ψ nvn (r, R) of energy W nvn ,…”

Section: Time-dependent Theoriesmentioning

confidence: 99%

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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Dissociation ofH2+in intense femtosecond laser fields studied by coincidence three-dimensional momentum imaging

Cited by 87 publications

References 47 publications

Intensity enhancement in the molecular ionization and dissociation dynamics in the presence of noise

Intensity enhancement in the molecular ionization and dissociation dynamics in the presence of noise

Influence of the initial angular distribution on strong-field molecular dissociation

Molecular ionization and dissociation using synchrotron radiation and ultrashort laser pulses

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