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Quantum Mechanical Studies of Bond and Molecular Polarizabilities of Gas-Phase Metal Halides

100%

Pandey A., Bigotto A., Gulati R.

Acta Physica Polonica A

1991

vol. 80

issue 4

503-520

The bond and molecular polarizabilities are studied for the gas-phase metal halides using delta-function potential model of chemical binding on the basis of quantum mechanical approach. The applicability of the model is demonstrated. The contribution of the polarity corrections for the metal halides is thoroughly investigated and it has been found that it plays a significant role for fluorides. Our polarizability calculations resolve the discrepancy about the conformation of the barium dichloride and mercury dichloride and favour the nonlinear structure. Due to lack of experimental results for most of halides of transition metals, the decision whether to incorporate polarity corrections or not remains uncertain at this stage: we must await measurements of more experimental values before we reach any final conclusion. The ionic bond orders have been used for the first time to investigate polarizabilities of monomers and dimers of alkali halides. The results for dimers reveal that polarity contribution is essential for the lithium halides dimers and not for other dimers. The computed results will be asset for the interpretation of experimental measurements.

Electron Energy Spectra from the Strong-Field Double-Ionization of Xenon

80%

Chaloupka J., Lafon R., Rudati J., Sheehy B., Agostini P., Kulander K., DiMauro L.

Acta Physica Polonica A

2002

vol. 101

issue 3

337-346

The electron energy spectra correlated to the strong-field double-ionization of xenon are presented at three laser intensities. The double-ionization electrons are on average more energetic than those generated from single-ionization. This difference in energy is not manifested as a simple scaling to higher electron energies, but rather as a change in the shape of the spectra. This trend is observed at all intensities. Most notably, the comparison between single- and double-ionization spectra is very similar at low and high peak laser intensities. This could imply that a sequential double-ionization process dominates at all intensities, even where the double ion yield is enhanced.

U_{P}, 3U_{P}, 11U_{P}: Above-Threshold Ionization Revisited

80%

Yang B., Schafer K. J., Walker B., Kulander K. C., Dimauro L. F., Agostini P.

Acta Physica Polonica A

1994

vol. 86

issue 1

41-50

Angular distributions of very high energy photoelectrons from Xe and Kr, excited by a 50 ps, 1054 um laser, are presented. In Xe strong, narrow structures 45° off the polarization axis appear on above-threshold ionization peaks within a limited energy range centered around 9U_{P}, where U_{P} is the intensity-dependent ponderomotive energy. Under the same conditions the effect is much weaker in krypton. These structures are discussed using a very simple classical model as well as sophisticated single active electron calculations and the Keldysh-Faisal-Reiss theory. We conclude these structures are the result of single-electron dynamics involving rescattering of a tunneling component of the continuum wave function.

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3 Acta Physica Polonica A

1 2002

1 1994

1 1991

2 Agostini P.

1 Bigotto A.

1 Chaloupka J.

1 DiMauro L.

1 Dimauro L. F.

1 Gulati R.

1 Kulander K.

1 Kulander K. C.

1 Lafon R.

1 Pandey A.

1 Rudati J.

1 Schafer K. J.

1 Sheehy B.

1 Walker B.

1 Yang B.

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Quantum Mechanical Studies of Bond and Molecular Polarizabilities of Gas-Phase Metal Halides

Electron Energy Spectra from the Strong-Field Double-Ionization of Xenon

U_{P}, 3U_{P}, 11U_{P}: Above-Threshold Ionization Revisited