The presence of a static electric field substantially enhances the dielectronic recombination (DR) rate below the classical field ionization limit and suppresses DR entirely above it. The addition of a small microwave field polarized orthogonally to the static field leads to a substantial DR signal above the classical ionization limit. We have examined DR from a continuum of finite bandwidth in static fields from 0 to 130 V/cm and with 8--11 GHz microwave fields of amplitudes up to 5 V/cm. We attribute the microwave-induced DR above the classical limit to the transfer of atoms by the microwave field from autoionizing the $m=0$ Rydberg intermediate states to higher m states. Since higher m states are more stable against field ionization, these states are more likely to decay radiatively to stable bound Stark states, thereby completing DR. This m-changing process most likely occurs by resonantly driving the $\ensuremath{\Delta}n=0,$ $\ensuremath{\Delta}m=1$ transitions of the autoionizing Rydberg-Stark states with the microwave field.The presence of a static electric field substantially enhances the dielectronic recombination (DR) rate below the classical field ionization limit and suppresses DR entirely above it. The addition of a small microwave field polarized orthogonally to the static field leads to a substantial DR signal above the classical ionization limit. We have examined DR from a continuum of finite bandwidth in static fields from 0 to 130 V/cm and with 8--11 GHz microwave fields of amplitudes up to 5 V/cm. We attribute the microwave-induced DR above the classical limit to the transfer of atoms by the microwave field from autoionizing the $m=0$ Rydberg intermediate states to higher m states. Since higher m states are more stable against field ionization, these states are more likely to decay radiatively to stable bound Stark states, thereby completing DR. This m-changing process most likely occurs by resonantly driving the $\ensuremath{\Delta}n=0,$ $\ensuremath{\Delta}m=1$ transitions of the autoionizing Rydberg-Stark states with the microwave field.

Physical Review AApr 29, 20031 citation

Two-center dielectronic recombination and resonant photoionization

Alexander B Voitkiv, Bennaceur Najjari

We consider radiative recombination and photoionization in an atomic system, which consists of two subsystems $A$ and $B$ . These subsystems are well separated in space and it is supposed that $A$ has a lower ionization potential. In such a case photoionization of $A$ and recombination of an incident electron with ${A}^{+}$ can be strongly influenced, via two-center electron-electron correlations, by resonant electron dipole transitions induced in $B$ . A theoretical description of these two-center resonant dielectronic processes is presented.We consider radiative recombination and photoionization in an atomic system, which consists of two subsystems $A$ and $B$. These subsystems are well separated in space and it is supposed that $A$ has a lower ionization potential. In such a case photoionization of $A$ and recombination of an incident electron with ${A}^{+}$ can be strongly influenced, via two-center electron-electron correlations, by resonant electron dipole transitions induced in $B$. A theoretical description of these two-center resonant dielectronic processes is presented.

Physical Review ANov 29, 201029 citations

m=0

Rydberg intermediate states to higher m states. Since higher m states are more stable against field ionization, these states are more likely to decay radiatively to stable bound Stark states, thereby completing DR. This m-changing process most likely occurs by resonantly driving the $\ensuremath{\Delta}n=0,$ $\ensuremath{\Delta}m=1$ transitions of the autoionizing Rydberg-Stark states with the microwave field.

We consider radiative recombination and photoionization in an atomic system, which consists of two subsystems

A

and

B

. These subsystems are well separated in space and it is supposed that

A

has a lower ionization potential. In such a case photoionization of

A

and recombination of an incident electron with

{A}^{+}

can be strongly influenced, via two-center electron-electron correlations, by resonant electron dipole transitions induced in

B

. A theoretical description of these two-center resonant dielectronic processes is presented.