Laser-induced collisional excitation transfer: a discussion of the two- and three-level approximations

An experimental study of laser-induced collisional energy transfer in a mixture of europium and strontium vapors is reported. The profile of the excitation spectrum in the static wing has been measured with high accuracy and compared with available calculations, demonstrating that simple two-level models are inadequate to describe the transfer process. A comparison with the predictions of a three-level model assuming dipole-dipole interaction, recently developed by Bambini and Berman, shows for the first time agreement between theory and experiment.An experimental study of laser-induced collisional energy transfer in a mixture of europium and strontium vapors is reported. The profile of the excitation spectrum in the static wing has been measured with high accuracy and compared with available calculations, demonstrating that simple two-level models are inadequate to describe the transfer process. A comparison with the predictions of a three-level model assuming dipole-dipole interaction, recently developed by Bambini and Berman, shows for the first time agreement between theory and experiment.

Physical Review AAug 1, 198733 citations

Laser-induced collisional energy transfer

Arturo Bambini, P. R. Berman, Roberto Buffa +2 more

Physics ReportsMar 1, 199421 citations

Collisional excitation transfer between atoms in the presence of a laser field

Man Mohan, Vinod Prasad

Physics Letters AAug 1, 19902 citations

Quenching and excitation transfers in n=3 lithium sublevels

Catherine Chaleard, Bernard Dubreuil, A. Catherinot

Quenching and excitation-transfer processes involving the $3^{2}P$ and $3^{2}D$ states of the Li atom are studied in a temperature-controlled heat-pipe oven with the use of two-step laser excitation of the $4^{2}S$ state followed by radiative cascade towards the $3^{2}P$ state. Numerical identification of the collision-induced $3^{2}D\ensuremath{\rightarrow}2^{2}P$ fluorescence with a three-level model allows the determination of radiative coefficients and collisional rate coefficients. $4^{2}S$ , $3^{2}D$ , and $3^{2}P$ radiative lifetimes are found to be in agreement with accepted values. Quenching and excitation transfer strongly depend on the colliding atoms. Rate coefficients for the $3^{2}D\ensuremath{\rightarrow}3^{2}P$ excitation processes induced by Li, He, and Ne ground-state atoms are measured in the ratio 1.05: 0.23: 0.02 expressed in ${10}^{\ensuremath{-}9}$ ${\mathrm{sec}}^{\ensuremath{-}1}$ ${\mathrm{cm}}^{3}$ .Quenching and excitation-transfer processes involving the $3^{2}P$ and $3^{2}D$ states of the Li atom are studied in a temperature-controlled heat-pipe oven with the use of two-step laser excitation of the $4^{2}S$ state followed by radiative cascade towards the $3^{2}P$ state. Numerical identification of the collision-induced $3^{2}D\ensuremath{\rightarrow}2^{2}P$ fluorescence with a three-level model allows the determination of radiative coefficients and collisional rate coefficients. $4^{2}S$, $3^{2}D$, and $3^{2}P$ radiative lifetimes are found to be in agreement with accepted values. Quenching and excitation transfer strongly depend on the colliding atoms. Rate coefficients for the $3^{2}D\ensuremath{\rightarrow}3^{2}P$ excitation processes induced by Li, He, and Ne ground-state atoms are measured in the ratio 1.05: 0.23: 0.02 expressed in ${10}^{\ensuremath{-}9}$ ${\mathrm{sec}}^{\ensuremath{-}1}$ ${\mathrm{cm}}^{3}$.

Physical Review ASep 1, 198221 citations

Strong-field effects in bichromatic laser-induced collisional energy transfer

Roberto Buffa, Stefano Cavalieri, R. Eramo +2 more

We discuss a scheme suitable for the study of strong-field effects on the excitation spectrum of the laser-induced collisional energy-transfer process. The use of a weak radiation field, to induce the interatomic transition, and a strong radiation field, to modify the energy-level position, is found to give rise to a splitting of the resonance peak. The position and the relative intensity of the two spectral components are strongly dependent on the intensity and detuning of the strong field. Line-shape calculations performed for the Eu-Sr system show that the effect is expected to be detectable even for moderate intensities of the strong field.We discuss a scheme suitable for the study of strong-field effects on the excitation spectrum of the laser-induced collisional energy-transfer process. The use of a weak radiation field, to induce the interatomic transition, and a strong radiation field, to modify the energy-level position, is found to give rise to a splitting of the resonance peak. The position and the relative intensity of the two spectral components are strongly dependent on the intensity and detuning of the strong field. Line-shape calculations performed for the Eu-Sr system show that the effect is expected to be detectable even for moderate intensities of the strong field.

Physical Review AAug 1, 19958 citations

Excitation Transfer in Atomic Collisions

Boris Michailovich Smirnov

Journal of Experimental and Theoretical PhysicsFeb 1, 19670 citations

Quenching and excitation-transfer processes involving the

3^{2}P

and

3^{2}D

states of the Li atom are studied in a temperature-controlled heat-pipe oven with the use of two-step laser excitation of the

4^{2}S

state followed by radiative cascade towards the

3^{2}P

state. Numerical identification of the collision-induced $3^{2}D\ensuremath{\rightarrow}2^{2}P$ fluorescence with a three-level model allows the determination of radiative coefficients and collisional rate coefficients.

4^{2}S

3^{2}D

, and

3^{2}P

radiative lifetimes are found to be in agreement with accepted values. Quenching and excitation transfer strongly depend on the colliding atoms. Rate coefficients for the $3^{2}D\ensuremath{\rightarrow}3^{2}P$ excitation processes induced by Li, He, and Ne ground-state atoms are measured in the ratio 1.05: 0.23: 0.02 expressed in ${10}^{\ensuremath{-}9}$ ${\mathrm{sec}}^{\ensuremath{-}1}$

{\mathrm{cm}}^{3}