Optics and Spectroscopy

Excited-state collisional relaxation by optical orientation of atoms with arbitrary electronic angular momentum

A. I. Okunevich

Published Mar 1, 1981• 0 citations

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Optics and Spectroscopy

Excited-state collisional relaxation by optical orientation of atoms with arbitrary electronic angular momentum

A. I. Okunevich

Published Mar 1, 1981• 0 citations

OpenAlex

Related papers

Dependence of collisional transfer from alignment to orientation on the angular momentum of an atomic state

A. G. Petrashen, V. N. Rebane, T. K. Rebane

Optics and SpectroscopyApr 1, 19911 citation

Anisotropic collisional relaxation of the order in atomic angular momenta and related polarization effects during laser excitation

A. G. Petrashen, V. N. Rebane, T. K. Rebane

Journal of Experimental and Theoretical PhysicsAug 1, 19931 citation

Analysis of collisional alignment and orientation studied by scattering of spin-polarized electrons from laser excited atoms

Ingolf Volker Hertel, Michael H. Kelley, Jabez J. McClelland

Zeitschrift für Physik D Atoms Molecules and ClustersJun 1, 198735 citations

Strong angular-momentum mixing in ultracold atom-ion excitation-exchange

Ruti Ben-shlomi, Romain Véxiau, Meir, Ziv +5 more

Atom-ion interactions occur through the electric dipole which is induced by the ion on the neutral atom. In a Langevin collision, in which the atom and ion overcome the centrifugal barrier and reach a short internuclear distance, their internal electronic states deform due to their interaction and can eventually alter. Here we explore the outcome products and the energy released from a single Langevin collision between a single cold $^{88}$ Sr $^{+}$ ion initialized in the metastable $4d^2D_{5/2,3/2}$ states, and a cold $^{87}$ Rb atom in the $5s^2S_{1/2}$ ground state. We found that the long-lived $D_{5/2}$ and $D_{3/2}$ states quench after roughly three Langevin collisions, transforming the excitation energy into kinetic energy. We identify two types of collisional quenching. One is an Electronic Excitation-Exchange process, during which the ion relaxes to the $S$ state and the atom is excited to the $P$ state, followed by energy release of $\sim$ 3000 K $\cdot$ k $_B$ . The second is Spin-Orbit Change where the ion relaxes from the higher fine-structure $D_{5/2}$ level to the lower $D_{3/2}$ level releasing $\sim$ 400 K $\cdot$ k $_B$ into kinetic motion. These processes are theoretically understood to occur through Landau-Zener avoided crossings between the different molecular potential curves. We also found that these relaxation rates are insensitive to the mutual spin orientation of the ion and atoms. This is explained by the strong inertial Coriolis coupling present in ultracold atom-ion collisions due to the high partial wave involved, which strongly mixes different angular momentum states. This inertial coupling explains the loss of the total electronic angular-momentum which is transferred to the external rotation of nuclei. Our results provide deeper understanding of ultracold atom-ion inelastic collisions and offer additional quantum control tools for the cold chemistry field.Atom-ion interactions occur through the electric dipole which is induced by the ion on the neutral atom. In a Langevin collision, in which the atom and ion overcome the centrifugal barrier and reach a short internuclear distance, their internal electronic states deform due to their interaction and can eventually alter. Here we explore the outcome products and the energy released from a single Langevin collision between a single cold $^{88}$Sr$^{+}$ ion initialized in the metastable $4d^2D_{5/2,3/2}$ states, and a cold $^{87}$Rb atom in the $5s^2S_{1/2}$ ground state. We found that the long-lived $D_{5/2}$ and $D_{3/2}$ states quench after roughly three Langevin collisions, transforming the excitation energy into kinetic energy. We identify two types of collisional quenching. One is an Electronic Excitation-Exchange process, during which the ion relaxes to the $S$ state and the atom is excited to the $P$ state, followed by energy release of $\sim$ 3000 K$\cdot$k$_B$. The second is Spin-Orbit Change where the ion relaxes from the higher fine-structure $D_{5/2}$ level to the lower $D_{3/2}$ level releasing $\sim$ 400 K$\cdot$k$_B$ into kinetic motion. These processes are theoretically understood to occur through Landau-Zener avoided crossings between the different molecular potential curves. We also found that these relaxation rates are insensitive to the mutual spin orientation of the ion and atoms. This is explained by the strong inertial Coriolis coupling present in ultracold atom-ion collisions due to the high partial wave involved, which strongly mixes different angular momentum states. This inertial coupling explains the loss of the total electronic angular-momentum which is transferred to the external rotation of nuclei. Our results provide deeper understanding of ultracold atom-ion inelastic collisions and offer additional quantum control tools for the cold chemistry field.

Dec 14, 20190 citations

Collisional orientation of atoms and molecules in a resonance light field

Anatolii M. Shalagin

Sep 1, 19792 citations

Manipulating atomic states via optical orbital angular-momentum

Xiong-Jun Liu, Xin Liu, L. C. Kwek +1 more

物理学前沿：英文版May 20, 200810 citations

^{88}

^{+}

ion initialized in the metastable

4d^2D_{5/2,3/2}

states, and a cold

^{87}

Rb atom in the

5s^2S_{1/2}

ground state. We found that the long-lived

D_{5/2}

and

D_{3/2}

states quench after roughly three Langevin collisions, transforming the excitation energy into kinetic energy. We identify two types of collisional quenching. One is an Electronic Excitation-Exchange process, during which the ion relaxes to the

S

state and the atom is excited to the

P

state, followed by energy release of

\sim

3000 K

\cdot

_B

. The second is Spin-Orbit Change where the ion relaxes from the higher fine-structure

D_{5/2}

level to the lower

D_{3/2}

level releasing

\sim

400 K

\cdot

_B

into kinetic motion. These processes are theoretically understood to occur through Landau-Zener avoided crossings between the different molecular potential curves. We also found that these relaxation rates are insensitive to the mutual spin orientation of the ion and atoms. This is explained by the strong inertial Coriolis coupling present in ultracold atom-ion collisions due to the high partial wave involved, which strongly mixes different angular momentum states. This inertial coupling explains the loss of the total electronic angular-momentum which is transferred to the external rotation of nuclei. Our results provide deeper understanding of ultracold atom-ion inelastic collisions and offer additional quantum control tools for the cold chemistry field.