INVESTIGADORES
RIVAROLA Roberto Daniel
artículos
Título:
Erasing the traces of classical mechanisms in ionization of H2 by quantum interferences
Autor/es:
O. A. FOJÓN; C. R. STIA; R. D. RIVAROLA
Revista:
PHYSICAL REVIEW A - ATOMIC, MOLECULAR AND OPTICAL PHYSICS
Editorial:
AMER PHYSICAL SOC
Referencias:
Lugar: New York; Año: 2011 vol. 84 p. 327151 - 327154
ISSN:
1050-2947
Resumen:
The single ionization of hydrogen molecules by fast electron impact is studied theoretically for transitions from
the ground (gerade) state to final ground (gerade) and first-excited (ungerade) states of H+2 . It is shown that under
definite conditions and for particular orientations of the molecule, the main physical features of the ionization
reaction, which are the binary and recoil peaks usually associated with classical mechanisms, are completely
erased by quantum interference effects that resemble the ones predicted previously for photoionization reactions.However, these new effects cannot be
derived from photoionization results, as the electromagnetic field cannot
transfer momentum. In addition, it is found that the emission spectra of transitions leading to the final gerade and
definite conditions and for particular orientations of the molecule, the main physical features of the ionization
reaction, which are the binary and recoil peaks usually associated with classical mechanisms, are completely
erased by quantum interference effects that resemble the ones predicted previously for photoionization reactions.However, these new effects cannot be
derived from photoionization results, as the electromagnetic field cannot
transfer momentum. In addition, it is found that the emission spectra of transitions leading to the final gerade and
gerade) state to final ground (gerade) and first-excited (ungerade) states of H+2 . It is shown that under
definite conditions and for particular orientations of the molecule, the main physical features of the ionization
reaction, which are the binary and recoil peaks usually associated with classical mechanisms, are completely
erased by quantum interference effects that resemble the ones predicted previously for photoionization reactions.However, these new effects cannot be
derived from photoionization results, as the electromagnetic field cannot
transfer momentum. In addition, it is found that the emission spectra of transitions leading to the final gerade andgerade and
ungerade states of the H+2 residual target are analogous in certain cases to the patterns of two sources emitting
waves in phase or antiphase, respectively. Finally, we show how an average of the emission from randomly
oriented molecules produces a binary peak at the classical expected position, in agreement with experiments.
waves in phase or antiphase, respectively. Finally, we show how an average of the emission from randomly
oriented molecules produces a binary peak at the classical expected position, in agreement with experiments.
states of the H+2 residual target are analogous in certain cases to the patterns of two sources emitting
waves in phase or antiphase, respectively. Finally, we show how an average of the emission from randomly
oriented molecules produces a binary peak at the classical expected position, in agreement with experiments.