Dissociative ionization of the H2 O molecule induced by medium-energy singly charged projectiles

S. T.S. Kovács, P. Herczku, Z. Juhász, L. Sarkadi, L. Gulyás, B. Sulik

Research output: Contribution to journalArticle

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Abstract

We report on the fragmentation of the water molecule by 1 MeV H+ and He+ and 650 keV N+ ion impact. The fragment-ion energy spectra were measured by an electrostatic spectrometer at different observation angles. The obtained double-differential fragmentation cross sections for N+ are found to be more than an order of magnitude higher than that for H+. The relative ratios of the fragmentation channels are also different for the three projectiles. Additional fragmentation channels were observed in the spectra for He+ and for N+ impact, which are missing in the case of H+. From the analysis of the kinetic energy of the fragments, the maximum observed degree of ionization was found to be qmax=3, 4, and 5 for H+, He+, and N+ impact, respectively. Absolute multiple-ionization cross sections have been determined. They are compared with the predictions of the classical trajectory Monte Carlo and continuum-distorted-wave eikonal-initial-state theories. At lower degrees of ionization, theories provide reasonable agreement with experiment. The systematic overestimation of the cross section by the theories towards higher degrees of ionization indicates the failure of the independent particle model.

Original languageEnglish
Article number032704
JournalPhysical Review A
Volume96
Issue number3
DOIs
Publication statusPublished - Sep 7 2017

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projectiles
fragmentation
ionization
molecules
fragments
ion impact
energy
cross sections
ionization cross sections
energy spectra
kinetic energy
trajectories
spectrometers
electrostatics
continuums
predictions
water
ions

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

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Dissociative ionization of the H2 O molecule induced by medium-energy singly charged projectiles. / Kovács, S. T.S.; Herczku, P.; Juhász, Z.; Sarkadi, L.; Gulyás, L.; Sulik, B.

In: Physical Review A, Vol. 96, No. 3, 032704, 07.09.2017.

Research output: Contribution to journalArticle

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N2 - We report on the fragmentation of the water molecule by 1 MeV H+ and He+ and 650 keV N+ ion impact. The fragment-ion energy spectra were measured by an electrostatic spectrometer at different observation angles. The obtained double-differential fragmentation cross sections for N+ are found to be more than an order of magnitude higher than that for H+. The relative ratios of the fragmentation channels are also different for the three projectiles. Additional fragmentation channels were observed in the spectra for He+ and for N+ impact, which are missing in the case of H+. From the analysis of the kinetic energy of the fragments, the maximum observed degree of ionization was found to be qmax=3, 4, and 5 for H+, He+, and N+ impact, respectively. Absolute multiple-ionization cross sections have been determined. They are compared with the predictions of the classical trajectory Monte Carlo and continuum-distorted-wave eikonal-initial-state theories. At lower degrees of ionization, theories provide reasonable agreement with experiment. The systematic overestimation of the cross section by the theories towards higher degrees of ionization indicates the failure of the independent particle model.

AB - We report on the fragmentation of the water molecule by 1 MeV H+ and He+ and 650 keV N+ ion impact. The fragment-ion energy spectra were measured by an electrostatic spectrometer at different observation angles. The obtained double-differential fragmentation cross sections for N+ are found to be more than an order of magnitude higher than that for H+. The relative ratios of the fragmentation channels are also different for the three projectiles. Additional fragmentation channels were observed in the spectra for He+ and for N+ impact, which are missing in the case of H+. From the analysis of the kinetic energy of the fragments, the maximum observed degree of ionization was found to be qmax=3, 4, and 5 for H+, He+, and N+ impact, respectively. Absolute multiple-ionization cross sections have been determined. They are compared with the predictions of the classical trajectory Monte Carlo and continuum-distorted-wave eikonal-initial-state theories. At lower degrees of ionization, theories provide reasonable agreement with experiment. The systematic overestimation of the cross section by the theories towards higher degrees of ionization indicates the failure of the independent particle model.

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