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Observation of Retardation in the Interaction Between Two Na Atoms Bound in a Molecule and a Determination of the Atomic 3P Lifetime

Kenneth Glyn Jones, Paul S. Julienne, Paul D. Lett, William D. Phillips, Eite Tiesinga, Carl J. Williams

Published Jan 1, 1996• 1 citation
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Efficient collisional dissociation of Na{sub 2}{sup +} by laser-excited Na (3p)

Charles Tapalian, W. W. Smith

In studying ionization reactions in a single dense effusive beam of laser-excited Na(3p) atoms, we observe production of both Na{sub 2}{sup +} and Na{sup +} ions. The Na{sup +} results from the familiar associative ionization reaction of two Na(3p) atoms and the Na{sup +} ions under our conditions result mostly from the collisional dissociation of the Na{sub 2}{sup +} by reaction with a third excited Na(3p) atom, rather than from photo- dissociation or photoionization. A CW, single-frequency dye laser tuned to 589 nm resonantly excites the Na(3s) atoms to the 3p state. The atomic beam Na(3s) density is determined from low-intensity 589 absorption measurements. Na{sup +} ion yield depends on the cube of the Na beam density, suggesting successive collisions of three Na(3p) atoms: we believe the Na{sub 2}{sup +} ions polarize the third Na(3p) atom, resulting in a R{sup -4} orbiting collision interaction. A large collisional dissociation cross-section of approximately (4{plus_minus}2)x10{sup -13} cm{sup 2} results, for oven temperatures in the 500-600K range.

Bulletin of the American Physical Society•May 1, 1993•0 citations
From molecular spectroscopy of the Na 2 purely long-range 0 − g state we determine the Na(3 P ) lifetime and measure the predicted but previously unobserved effect of retardation in the interaction between two atoms. Our lifetime τ( P 3/2 ) = 16.230(16) ns helps to remove a longstanding discrepancy between experiment and theory. Electron cloud overlap is unimportant in the 0 − g state ( R > 55 a 0 ) and the spectrum is calculated, ab initio , from atomic properties. By measuring the binding energies the 120 MHz correction due to retardation of the resonant-dipole R −3 interaction is confirmed.
Differential scattering of Na 3Ssub1sub 1sub1/sub2sub 2sub2 and 3Psub3sub 3sub3/sub2sub 2sub2 from Ne: Determination of ground- and excited-state potentials for NaNe
We report high-resolution measurements of the differential cross section for scattering Na in its 3Ssub1sub 1sub1/sub2sub 2sub2 and 3Psub3sub 3sub3/sub2sub 2sub2 states from Ne. A new scheme is used to maintain a high fraction (approx.20%) of an atomic beam of Na in the excited state for many radiative lifetimes using a single-mode cw dye laser. The differential cross sections are interpreted to yield interatomic potential curves for both the XSigmaSigmaSigma and APi states of the NaNe molecule which seriously disagree with recent pseudopotential calculations. (AIP)
In studying ionization reactions in a single dense effusive beam of laser-excited Na(3p) atoms, we observe production of both Na{sub 2}{sup +} and Na{sup +} ions. The Na{sup +} results from the familiar associative ionization reaction of two Na(3p) atoms and the Na{sup +} ions under our conditions result mostly from the collisional dissociation of the Na{sub 2}{sup +} by reaction with a third excited Na(3p) atom, rather than from photo- dissociation or photoionization. A CW, single-frequency dye laser tuned to 589 nm resonantly excites the Na(3s) atoms to the 3p state. The atomic beam Na(3s) density is determined from low-intensity 589 absorption measurements. Na{sup +} ion yield depends on the cube of the Na beam density, suggesting successive collisions of three Na(3p) atoms: we believe the Na{sub 2}{sup +} ions polarize the third Na(3p) atom, resulting in a R{sup -4} orbiting collision interaction. A large collisional dissociation cross-section of approximately (4{plus_minus}2)x10{sup -13} cm{sup 2} results, for oven temperatures in the 500-600K range.