Details

Autor(en) / Beteiligte

• Lefebvre, R.
• Atabek, O.

Titel

Dissociation quenching using exceptional points

Ist Teil von

• Journal of molecular modeling, 2013-05, Vol.19 (5), p.1959-1965

Ort / Verlag

Berlin/Heidelberg: Springer-Verlag

Erscheinungsjahr

2013

Quelle

SpringerNature Journals

Beschreibungen/Notizen

• We examine a short way to reach an exceptional point that corresponds to a coalescence of two resonance energies. The application concerns the photodissociation of the Na 2 molecule exposed to a laser field. In this case, the resonances can be correlated with the field-free vibrational states of the diatomic species. The resonances are due to the field-induced coupling with the continuum of a repulsive potential. We also draw attention to a new kind of exceptional point involving a resonance originating from a vibrational state coalescing with a shape-type resonance of the repulsive potential. A laser control scenario, aiming at the adiabatic transport from this field-free decaying state to a stable field-free vibrational state, is discussed in terms of field-induced dissociation quenching. Figure Laser-controlled Dissociation Quenching mechanism in Na 2 using an Exceptional Point resulting from the merging of a shape-type resonance ( R 8 ) and a Feshbach one originating from a vibrational bound state (v=0). The population transfer process is indicated by the blue arrow of the left panel. The laser-controlled energy trajectory from R 8 (decaying state) to v=0 (stable state) is displayed in the middle panel, while the survival probability is given in the right panel. An efficiency of about 25 % is reached for the quenching control.