INVESTIGADORES
RIVAROLA Roberto Daniel
artículos
Título:
Impact ionization of molecular oxygen by 3.5-MeV/u bare carbon ions
Autor/es:
S. NANDI; A. N. AGNIHOTRI; S. KASTHURIRANGAN; A. KUMAR; C. A. TACHINO; R. D. RIVAROLA; F. MARTíN; L. C. TRIBEDI
Revista:
PHYSICAL REVIEW A - ATOMIC, MOLECULAR AND OPTICAL PHYSICS
Editorial:
AMER PHYSICAL SOC
Referencias:
Lugar: New York; Año: 2012 vol. 85 p. 627051 - 627058
ISSN:
1050-2947
Resumen:
We have measured the absolute double-differential cross sections (DDCSs) for electron emission in ionization
of O2 molecules under the impact of 3.5-MeV/u C6+ ions. The data were collected between 10 and 600 eV, in
an angular range of 30◦ to 150◦. The single-differential cross sections (SDCSs) in emission angle and electron
energy are deduced from the electron DDCS spectra. Also, the total cross section has been obtained from the
SDCS spectra. The DDCS spectra as well as the SDCS spectra are compared with continuum distorted-wave
eikonal initial-state calculations which employ molecular wave functions built as linear combinations of atomic
orbitals. The DDCS ratio i.e. óO2/2óO, derived by dividing the experimental DDCS for molecular oxygen
with the theoretical DDCS for atomic oxygen, does not show any primary or secondary oscillations arising from
Young-type interference, which is apparently in contrast to what has been observed earlier forH2 and in agreement
with the model calculation. Similarly, the forward-backward angular asymmetry increases monotonically with
the velocity of the emitted electrons. However, the results on the DDCSs, SDCSs, the asymmetry parameter, and
the nonexistence of oscillations are in qualitative agreement with the predictions of the model used.2 molecules under the impact of 3.5-MeV/u C6+ ions. The data were collected between 10 and 600 eV, in
an angular range of 30◦ to 150◦. The single-differential cross sections (SDCSs) in emission angle and electron
energy are deduced from the electron DDCS spectra. Also, the total cross section has been obtained from the
SDCS spectra. The DDCS spectra as well as the SDCS spectra are compared with continuum distorted-wave
eikonal initial-state calculations which employ molecular wave functions built as linear combinations of atomic
orbitals. The DDCS ratio i.e. óO2/2óO, derived by dividing the experimental DDCS for molecular oxygen
with the theoretical DDCS for atomic oxygen, does not show any primary or secondary oscillations arising from
Young-type interference, which is apparently in contrast to what has been observed earlier forH2 and in agreement
with the model calculation. Similarly, the forward-backward angular asymmetry increases monotonically with
the velocity of the emitted electrons. However, the results on the DDCSs, SDCSs, the asymmetry parameter, and
the nonexistence of oscillations are in qualitative agreement with the predictions of the model used.◦ to 150◦. The single-differential cross sections (SDCSs) in emission angle and electron
energy are deduced from the electron DDCS spectra. Also, the total cross section has been obtained from the
SDCS spectra. The DDCS spectra as well as the SDCS spectra are compared with continuum distorted-wave
eikonal initial-state calculations which employ molecular wave functions built as linear combinations of atomic
orbitals. The DDCS ratio i.e. óO2/2óO, derived by dividing the experimental DDCS for molecular oxygen
with the theoretical DDCS for atomic oxygen, does not show any primary or secondary oscillations arising from
Young-type interference, which is apparently in contrast to what has been observed earlier forH2 and in agreement
with the model calculation. Similarly, the forward-backward angular asymmetry increases monotonically with
the velocity of the emitted electrons. However, the results on the DDCSs, SDCSs, the asymmetry parameter, and
the nonexistence of oscillations are in qualitative agreement with the predictions of the model used.óO2/2óO, derived by dividing the experimental DDCS for molecular oxygen
with the theoretical DDCS for atomic oxygen, does not show any primary or secondary oscillations arising from
Young-type interference, which is apparently in contrast to what has been observed earlier forH2 and in agreement
with the model calculation. Similarly, the forward-backward angular asymmetry increases monotonically with
the velocity of the emitted electrons. However, the results on the DDCSs, SDCSs, the asymmetry parameter, and
the nonexistence of oscillations are in qualitative agreement with the predictions of the model used.2 and in agreement
with the model calculation. Similarly, the forward-backward angular asymmetry increases monotonically with
the velocity of the emitted electrons. However, the results on the DDCSs, SDCSs, the asymmetry parameter, and
the nonexistence of oscillations are in qualitative agreement with the predictions of the model used.