Dissociation Dynamics ofH2+in Intense Laser Fields: Investigation of Photofragments from Single Vibrational Levels

Abstract

We present a photodissociation experiment on H+2 with ultrashort laser pulses ( >/=130 fs) at peak intensities of </=1.5x10(14) W/cm(2). Since in an ion beam setup H+2 is produced in a discharge source spatially separated from the light interaction zone interference with neutral H2 can be excluded in the interpretation. As the beam setup allows a high energy resolution of photofragments, effects predicted by the light induced potential theory can be tested in detail. The one-photon trapping effect was detected and the angular distributions of fragments from single vibrational levels were measured. Fragment energy spectra deviate strongly from those obtained by experiments on H2.

Nuclear-wave-packet quantum interference in the intense laser dissociation of the D2+molecule

“…In all of our calculations the initial nuclear wave packet (at t = 0 fs) was chosen to be in its rotational ground state (J = 0) and in some of its vibrational eigenstate (ν = 0,1,2,3,4). In this way the angular distribution of the photofragments can provide accurate information about the dissociation of single vibrational levels [20]. Nonaligned (isotropic) molecules and linearly polarized Gaussian laser pulses centered around t = 0 fs were used in the numerical simulations.…”

“…One of the clearest observable manifestation of the topological or Berry phase in a molecular system is the appearance of a quantum interference effect [17,18]. In order to illustrate this fundamental effect for the present LICI situation, we have chosen as an explicit example the photodissociation of the D 2 + molecule, which has been extensively studied for more than two decades [19][20][21][22][23][24]. In addition, it has also an advantage: Due to its relative simplicity one can study the new light-induced nonadiabatic phenomena separately from other processes.…”

Unusual Bound or Localized States

“…However, these potentials are rather peculiar because each of them consists of parts of the two original potentials. The formation of new bound states [26] in this light induced molecule has been observed experimentally [27].Trojan asteroids are celestial bodies that are held in their positions by the gravitational forces of the sun and Jupiter. A similar phenomenon can occur [28] in an atom where the electron plays the role of a Trojan asteroid, and the nucleus substitutes for one of the two planets.…”

Suppression of Multiple Ionization of Atomic Ions in Intense Ultrafast Laser Pulses

“…DOI: 10.1103/PhysRevLett.88.233001 PACS numbers: 32.80.Fb There is considerable current interest in the interaction of high intensity ͑10 13 10 18 W cm 22 ͒ radiation with dilute matter, where the external electric field strength becomes comparable to molecular bond and valance electron binding strengths. Studies have been carried out with targets of atoms, molecules, clusters [1], and most recently molecular ions [2,3], in order to elucidate the new physics observable in this highly nonlinear regime. These include the study of high harmonic generation [4], strong field effects in molecular dissociation, and the enhancement of multiple ionization in atoms [5,6].…”

“…Studies have been carried out with targets of atoms, molecules, clusters [1], and most recently molecular ions [2,3], in order to elucidate the new physics observable in this highly nonlinear regime. These include the study of high harmonic generation [4], strong field effects in molecular dissociation, and the enhancement of multiple ionization in atoms [5,6].…”