Multiphoton excitation and ionization of atoms and molecules

Bruzzese, R.; Sasso, Antonio; Solimeno, S.

doi:10.1007/bf02743063

Cited by 17 publications

(5 citation statements)

References 175 publications

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“…Inside our approach, this destructive trend can be understood by looking at the average number of emitted electrons N esc , which dramatically grows with intensity. That is not surprising because n-photon processes grow with I n [28]. The strong outflow of charge (indicated by large N esc ) has a large back effect on the mean field at the cluster site.…”

Section: (Received 3 November 1999)mentioning

confidence: 92%

Towards Single-Particle Spectroscopy of Small Metal Clusters

2000

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We investigate the kinetic-energy spectra of electrons emitted from a metal cluster following laser excitation. This is done in the framework of a coupled ionic and electronic dynamics. Properly chosen laser parameters, leading to gentle excitations, yield kinetic-energy spectra which nicely resolve the multiphoton processes for each occupied state separately. This gives access to the single-particle energies in clusters, provided one works at sufficiently low temperatures and low electron flow.

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Section: (Received 3 November 1999)mentioning

confidence: 92%

Towards Single-Particle Spectroscopy of Small Metal Clusters

2000

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“…(5) is performed over all possible intermediate electronic states R with energy E R in the discrete and continuous spectrum, which is a formidable task since the dipole transition amplitudes between two continuous states are diverging. The present approach to compute the matrix element (5) consists in introducing the so-called single-particle correlation function (see, e.g., Refs. [27,28]).…”

Section: B Two-photon Transition Matrix Elementmentioning

confidence: 99%

“…Multiphoton ionization (MPI) of molecules is a wellestablished branch of spectroscopy that has a substantial body of literature (see, e.g., selected reviews [1][2][3][4][5][6] and references therein). On the one hand, entirely new states are seen in MPI spectra of molecules.…”

Section: Introductionmentioning

confidence: 99%

Theoretical study of angular-resolved two-photon ionization of H2

2012

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Cross sections and angular distribution parameters of electrons ejected via two-photon ionization of the hydrogen molecule by linearly and circularly polarized light are computed in the exciting-photon energy range of 8-14 eV, which covers the first four optical resonant states of the molecule. Photoelectron partial waves in the continuous spectrum are obtained within the single center method in precise numerical potential of the molecular ion field. The correlation function technique is used to calculate the two-photon transition matrix element. The presently computed angular-resolved spectra are in good agreement with the theoretical results available for the photon energy of 8.854 eV and can be considered as reliable predictions in the respective energy range.

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“…The opposite can be said for the tunneling case where the large laser electric field distorts the atomic Coulomb potential well [67]. A complete theoretical study on multiphoton ionization is given by Bruzzese et al [11].…”

Section: Gas Laser Ionization Processmentioning

confidence: 99%

Plasma channel and Z-pinch dynamics for heavy ion transport

Ponce-Marquez¹

2002

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A self stabilized, free standing, z-pinch plasma channel has been proposed to deliver the high intensity heavy ion beam from the end of a driver to the fuel target in a heavy ion inertial fusion power plant. The z-pinch relaxes emittance and energy spread requirements requiring a lower cost driver. A z-pinch transport would reduce the number of beam entry port holes to the target chamber from over a hundred to four as compared to neutralized ballistic focusing thus reducing the driver hardware exposure to neutron flux. Experiments where a double pulse discharge technique is used, z-pinch plasma channels with enhanced stability are achieved. Typical parameters are 7 kV pre-pulse discharge and 30 kV main bank discharge with 50 kA of channel current in a 7 torr background gas atmosphere. This work is an experimental study of these plasma channels examining the relevant physics necessary to understand and model such plasmas. Laser diagnostics measured the dynamical properties 2 of neutrals and plasma. Schlieren and phase contrast techniques probe the pre-pulse gas dynamics and infrared interferometry and faraday effect polarimetry are used on the zpinch to study its electron density and current distribution. Stability and repeatability of the z-pinch depend on the initial conditions set by the pre-pulse. Results show that the z-pinch channel is wall stabilized by an on-axis gas density depression created by the pre-pulse through hydrodynamic expansion where the ratio of the initial gas density to the final gas density is > 10/1. The low on-axis density favors avalanching along the desired path for the main bank discharge. Pinch time is around 2 µs from the main bank discharge initiation with a FWHM of ≈ 2 cm. Results also show that typical main bank discharge plasma densities reach 10 17 cm −3 peak on axis for a 30 kV, 7 torr gas nitrogen discharge.Current rise time is limited by the circuit-channel inductance with the highest contribution to the impedance due to the plasma. There is no direct evidence of surface currents due to high frequency skin effects and magnetic field experiments indicate that > 70% of the current carried by the channel is enclosed within FWHM of the channel. Code-experiment benchmark comparisons show that simulations capture the main mechanisms of the channel evolution, but complete atomic models need to be incorporated.

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Multiphoton excitation and ionization of atoms and molecules

Cited by 17 publications

References 175 publications

Towards Single-Particle Spectroscopy of Small Metal Clusters

Towards Single-Particle Spectroscopy of Small Metal Clusters

Theoretical study of angular-resolved two-photon ionization of H2

Plasma channel and Z-pinch dynamics for heavy ion transport

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