We have observed ion formation (both ${\mathrm{Na}}^{+}$ and ${\mathrm{Na}}_{2}^{+}$ ) and radiation from high-lying Na states when low-density vapor (\ensuremath{\sim} ${10}^{13}$ ${\mathrm{cm}}^{\ensuremath{-}3}$) is irradiated with a cw dye laser tuned to one of the $D$ lines. The ${\mathrm{Na}}^{+}$ ions probably result from photodissociation of ${\mathrm{Na}}_{2}^{+}$ formed by $\mathrm{Na}(3p)\ensuremath{-}\mathrm{Na}(3p)$ associative ionization, while the high-lying radiating states are formed in energy-pooling reactions.We have observed ion formation (both ${\mathrm{Na}}^{+}$ and ${\mathrm{Na}}_{2}^{+}$) and radiation from high-lying Na states when low-density vapor (\ensuremath{\sim}${10}^{13}$ ${\mathrm{cm}}^{\ensuremath{-}3}$) is irradiated with a cw dye laser tuned to one of the $D$ lines. The ${\mathrm{Na}}^{+}$ ions probably result from photodissociation of ${\mathrm{Na}}_{2}^{+}$ formed by $\mathrm{Na}(3p)\ensuremath{-}\mathrm{Na}(3p)$ associative ionization, while the high-lying radiating states are formed in energy-pooling reactions.

Physical Review LettersOct 30, 197863 citations

Energy-pooling collisions for K(4P)+Rb(5P) and Na(3P)+Rb(5P) heteronuclear systems

C. Gabbanini, Silvia Gozzini, G. Squadrito +2 more

The rate constants of the energy-pooling collisions in the Na-Rb and K-Rb vapor mixtures, resonantly excited by two cw dye lasers, have been measured relative to a known energy-pooling rate constant of a homonuclear reaction. To isolate the heteronuclear contribution in the fluorescence spectrum, a double-modulation technique has been adopted. The effective lifetimes of the excited levels that explicitly appear in the solution equation have been directly measured by using pulsed lasers. A discussion about the collision cross-section dependence on the energy defect involved in the energy-pooling collisions is reported.The rate constants of the energy-pooling collisions in the Na-Rb and K-Rb vapor mixtures, resonantly excited by two cw dye lasers, have been measured relative to a known energy-pooling rate constant of a homonuclear reaction. To isolate the heteronuclear contribution in the fluorescence spectrum, a double-modulation technique has been adopted. The effective lifetimes of the excited levels that explicitly appear in the solution equation have been directly measured by using pulsed lasers. A discussion about the collision cross-section dependence on the energy defect involved in the energy-pooling collisions is reported.

Physical Review AJun 1, 198933 citations

Energy Transfer Collisions in Laser-Excited Mixtures of Alkali Vapors

S. Abdullah, M. Allegrini, Silvia Gozzini +1 more

Springer proceedings in physicsJan 1, 19871 citation

We have observed ion formation (both

{\mathrm{Na}}^{+}

and

{\mathrm{Na}}_{2}^{+}

) and radiation from high-lying Na states when low-density vapor (\ensuremath{\sim}

{10}^{13}

${\mathrm{cm}}^{\ensuremath{-}3}$) is irradiated with a cw dye laser tuned to one of the

D

lines. The

{\mathrm{Na}}^{+}

ions probably result from photodissociation of

{\mathrm{Na}}_{2}^{+}

formed by $\mathrm{Na}(3p)\ensuremath{-}\mathrm{Na}(3p)$ associative ionization, while the high-lying radiating states are formed in energy-pooling reactions.