Challenges
Datasets
Workspaces
Papers
Discussions
Leaderboard
Log inSign up
Challenges
Datasets
Workspaces
Papers
Discussions
Leaderboard
Blog
Job Board
Q3AS

© 2026 Aqora Quantum S.A.S.

TermsPrivacyLegal Notice

Physical Review Letters

Differential scattering of Na 3S$sub 1$/$sub 2$ and 3P$sub 3$/$sub 2$ from Ne: Determination of ground- and excited-state potentials for NaNe

Gary M. Carter, David E. Pritchard, M. L. Kaplan, Theodore W. Ducas

Published Oct 27, 1975• 0 citations
OpenAlex

Abstract

We report high-resolution measurements of the differential cross section for scattering Na in its 3S$sub 1$/$sub 2$ and 3P$sub 3$/$sub 2$ 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 X$Sigma$ and APi states of the NaNe molecule which seriously disagree with recent pseudopotential calculations. (AIP)

Related papers

Differential Scattering of Na 3S12 and 3P32 from Ne: Determination of Ground- and Excited-State Potentials for NaNe

Gary M. Carter, David E. Pritchard, Martin Kaplan +1 more

We report high-resolution measurements of the differential cross section for scattering Na in its $3{S}_{\frac{1}{2}}$ and $3{P}_{\frac{3}{2}}$ states from Ne. A new scheme is used to maintain a high fraction (\ensuremath{\sim}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 $X\ensuremath{\Sigma}$ and $A\ensuremath{\Pi}$ states of the NaNe molecule which seriously disagree with recent pseudopotential calculations.

Physical Review Letters•Oct 27, 1975•93 citations

Measurement and evaluation of differential scattering cross sections for Na2P3/2with Hg

Rudolf Düren, H -O Hoppe

The differential cross section has been measured for the interaction of Na 2 P 3/2 with Hg. The excitation of Na has been achieved with linearly polarised light of a CW dye laser. The measurements have been evaluated by fitting the parameters of a pseudopotential from which the interatomic potentials have been obtained. The scattering calculation for these interatomic potentials is performed by integrating the coupled Schrodinger equations for the six coupled channels resulting from the P states with J= 3 / 2 and 1 / 2 and their respective values of m j . This experiment and the experiment for the ground-state interaction are now both described by a common calculation using the pseudopotential method.

Journal of Physics B Atomic and Molecular Physics•Jun 28, 1978•30 citations

Cross-section measurement for the energy-transfer collisions Na(3P)+Na(3P)→Na(5S,4D)+Na(3S)

M. Allegrini, Paola Bicchi, L. Moi

We report our measurements of the cross sections ${\ensuremath{\sigma}}_{5S}$ and ${\ensuremath{\sigma}}_{4D}$ for the electronic-energy-transfer process $\mathrm{Na}(3P)+\mathrm{Na}(3P)\ensuremath{\rightarrow}\mathrm{Na}(5S,4D)+\mathrm{Na}(3S)$. To obtain these cross sections we have measured the fluorescence intensity for the transitions $5S\ensuremath{\rightarrow}3P$, $4D\ensuremath{\rightarrow}3P$, and $3P\ensuremath{\rightarrow}3S$ in sodium vapor excited with a cw dye laser. The study of this electronic energy transfer is complicated and there is a large disagreement (\ensuremath{\gtrsim}${10}^{4}$) among reported measurements. We believe we have avoided most of the difficulties of previous experiments. Our results are ${\ensuremath{\sigma}}_{5S}=(2.0\ifmmode\pm\else\textpm\fi{}0.7)\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}15}$ ${\mathrm{cm}}^{2}$ and ${\ensuremath{\sigma}}_{4D}=(3.2\ifmmode\pm\else\textpm\fi{}1.1)\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}15}$ ${\mathrm{cm}}^{\ensuremath{-}2}$, and they are compared with the results of other experiments.

Physical Review A•Sep 1, 1983•59 citations

Laser Spectroscopy of Bound NaNe Molecules

Riad Ahmad-Bitar, W. P. Lapatovich, David E. Pritchard +1 more

We have produced the van der Waals molecule NaNe in a supersonic expansion, and have studied the $A^{2}\ensuremath{\Pi}\ensuremath{\rightarrow}X^{2}\ensuremath{\Sigma}$ transition using a single-mode cw dye laser. Using analysis based on isotope shifts and the long-range ${R}^{\ensuremath{-}6}$ behavior of the excited-state $A^{2}\ensuremath{\Pi}$ potential, we find its well depth and location to be ${D}_{\mathrm{eA}}=140\ifmmode\pm\else\textpm\fi{}3$ ${\mathrm{cm}}^{\ensuremath{-}1}$ at ${\mathcal{r}}_{\mathrm{eA}}=(5.1\ifmmode\pm\else\textpm\fi{}0.1){a}_{0}$ and for the $X^{2}\ensuremath{\Sigma}$ ground state, ${D}_{\mathrm{eX}}=8.1\ifmmode\pm\else\textpm\fi{}0.9$ ${\mathrm{cm}}^{\ensuremath{-}1}$ at ${\mathcal{r}}_{\mathrm{eX}}=(10.0\ifmmode\pm\else\textpm\fi{}0.2){a}_{0}$. These results are compared with pseudopotential calculations and several recent line-broadening and collisions experiments.

Physical Review Letters•Dec 26, 1977•60 citations

Cross sections for the Na(4D)→Na(4F) excitation energy transfer induced by collisions with He, Ar and Na atoms

Vlasta Horvatić, Mladen Movre, Cedomil Vadla

Abstract. The cross sections for the Na.4D/! Na.4F / excitation energy transfer induced by collisions with He, Ar and Na ground-state atoms have been measured. The sodium atoms in the 4D state have been produced by two-photon excitation using cw laser radiation at 578.89 nm. Within a model which takes into account collisional population and depopulation of the 4F level as well as radiative relaxation (direct or cascade) of the 3D, 4P, 4D and 4F states ending in the 3P level, the rate for the Na.4D / ! Na.4F / collisional transfer turns out to be related to the ratio of the steady-state populations created in 3D and 4D states. They have been determined by measuring the fluorescence intensities of the 3D! 3P and 4D! 3P transitions. The measurements yield the following cross section values for those

•Jan 1, 1997•0 citations

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
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)
We report high-resolution measurements of the differential cross section for scattering Na in its 3S123{S}_{\frac{1}{2}}3S21​​ and 3P323{P}_{\frac{3}{2}}3P23​​ states from Ne. A new scheme is used to maintain a high fraction (\ensuremath{\sim}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 $X\ensuremath{\Sigma}$ and $A\ensuremath{\Pi}$ states of the NaNe molecule which seriously disagree with recent pseudopotential calculations.
The differential cross section has been measured for the interaction of Na 2 P 3/2 with Hg. The excitation of Na has been achieved with linearly polarised light of a CW dye laser. The measurements have been evaluated by fitting the parameters of a pseudopotential from which the interatomic potentials have been obtained. The scattering calculation for these interatomic potentials is performed by integrating the coupled Schrodinger equations for the six coupled channels resulting from the P states with J= 3 / 2 and 1 / 2 and their respective values of m j . This experiment and the experiment for the ground-state interaction are now both described by a common calculation using the pseudopotential method.
We report our measurements of the cross sections ${\ensuremath{\sigma}}_{5S}$ and ${\ensuremath{\sigma}}_{4D}$ for the electronic-energy-transfer process $\mathrm{Na}(3P)+\mathrm{Na}(3P)\ensuremath{\rightarrow}\mathrm{Na}(5S,4D)+\mathrm{Na}(3S)$. To obtain these cross sections we have measured the fluorescence intensity for the transitions $5S\ensuremath{\rightarrow}3P$, $4D\ensuremath{\rightarrow}3P$, and $3P\ensuremath{\rightarrow}3S$ in sodium vapor excited with a cw dye laser. The study of this electronic energy transfer is complicated and there is a large disagreement (\ensuremath{\gtrsim}104{10}^{4}104) among reported measurements. We believe we have avoided most of the difficulties of previous experiments. Our results are ${\ensuremath{\sigma}}_{5S}=(2.0\ifmmode\pm\else\textpm\fi{}0.7)\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}15}$ cm2{\mathrm{cm}}^{2}cm2 and ${\ensuremath{\sigma}}_{4D}=(3.2\ifmmode\pm\else\textpm\fi{}1.1)\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}15}$ ${\mathrm{cm}}^{\ensuremath{-}2}$, and they are compared with the results of other experiments.
We have produced the van der Waals molecule NaNe in a supersonic expansion, and have studied the $A^{2}\ensuremath{\Pi}\ensuremath{\rightarrow}X^{2}\ensuremath{\Sigma}$ transition using a single-mode cw dye laser. Using analysis based on isotope shifts and the long-range ${R}^{\ensuremath{-}6}$ behavior of the excited-state $A^{2}\ensuremath{\Pi}$ potential, we find its well depth and location to be ${D}_{\mathrm{eA}}=140\ifmmode\pm\else\textpm\fi{}3$ ${\mathrm{cm}}^{\ensuremath{-}1}$ at ${\mathcal{r}}_{\mathrm{eA}}=(5.1\ifmmode\pm\else\textpm\fi{}0.1){a}_{0}$ and for the $X^{2}\ensuremath{\Sigma}$ ground state, ${D}_{\mathrm{eX}}=8.1\ifmmode\pm\else\textpm\fi{}0.9$ ${\mathrm{cm}}^{\ensuremath{-}1}$ at ${\mathcal{r}}_{\mathrm{eX}}=(10.0\ifmmode\pm\else\textpm\fi{}0.2){a}_{0}$. These results are compared with pseudopotential calculations and several recent line-broadening and collisions experiments.
Abstract. The cross sections for the Na.4D/! Na.4F / excitation energy transfer induced by collisions with He, Ar and Na ground-state atoms have been measured. The sodium atoms in the 4D state have been produced by two-photon excitation using cw laser radiation at 578.89 nm. Within a model which takes into account collisional population and depopulation of the 4F level as well as radiative relaxation (direct or cascade) of the 3D, 4P, 4D and 4F states ending in the 3P level, the rate for the Na.4D / ! Na.4F / collisional transfer turns out to be related to the ratio of the steady-state populations created in 3D and 4D states. They have been determined by measuring the fluorescence intensities of the 3D! 3P and 4D! 3P transitions. The measurements yield the following cross section values for those
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.