The experimental study of a laser-induced energy transfer for a dipole-dipole collisional interaction in a Na-Ca mixture is reported. A specific excitation scheme is used in this experiment for which the virtual level is optically excited. A comparison with the case of a dipole-dipole interaction in the Eu-Sr mixture where the virtual level is excited by collisional energy transfer is presented.

Journal of Physics B Atomic and Molecular PhysicsFeb 14, 198329 citations

Springer series in optical sciences/SPringer series in optical sciences

Light-Assisted Collisional Energy Transfer

Ph. Cahuzac, P. E. Toschek

Published Jan 1, 1977• 3 citations

Publisher

DOI: 10.1007/978-3-540-35968-5_56

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\mathrm{Na}(\mathrm{ns})

atoms. The collisional resonance occurs when the microwave frequency $\ensuremath{\nu}$ equals the collisional energy defect $\frac{\ensuremath{\Delta}W}{h}$. The observed cross sections are very large (\ensuremath{\sim}

{10}^{8}

{\mathrm{\AA{}}}^{2}

) and require very low microwave power, \ensuremath{\sim}10 W/

{\mathrm{cm}}^{2}

. These observations are in good agreement with an intuitive two-photon absorption model for these collisions.