Global analysis of the NaNe excimer band systems: A molecule between Hund’s cases

Gottscho, Richard A.; Ahmad‐Bitar, Riad; Lapatovich, W. P.; Renhorn, Ingmar; Pritchard, David E.

doi:10.1063/1.442432

Cited by 56 publications

(24 citation statements)

References 39 publications

(6 reference statements)

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“…The vibrational structure of the electronic A 2 states was also investigated experimentally 14 for the vibrational levels ν = 10-16. Looking first at the average rotational constant B(ν), we observe that our calculation is in excess with respect to experimental values by 1% for B (10) and up to 4% for B (16). This difference is striking, because it suggests that the positions of the classical inner turning points of our calculated PEC are too short, while it is expected that any improvement of the calculation would produce a more compact PEC, with slightly shorter inner turning point positions.…”

Section: Excited Statesmentioning

confidence: 61%

“…Previous studies of the ground and lowest excited states of alkali-RG dimers have been performed. Experimentally, very accurate rovibrational spectrum were recorded for LiHe, 6 LiNe, 7 LiAr, 8 NaNe, 9,10 NaAr, 11 NaKr, 12,13 NaXe, 14 and also KAr. 15 These measurements were used to extract potential energy curves for the X 2 state and the excited A 2 1 2 and A 2 3 2 states.…”

Section: Introductionmentioning

confidence: 99%

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Potential energy curves and spin-orbit coupling of light alkali-heavy rare gas molecules

Galbis

Douady

Jacquet

et al. 2013

The Journal of Chemical Physics

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The potential energy curves of the X, A, and B states of alkali-rare gas diatomic molecules, MKr and MXe, are investigated for M = Li, Na, K. The molecular spin-orbit coefficients a(R) = are calculated as a function the interatomic distance R. We show that a(R) increases and b(R) decreases as R decreases. This effect becomes less and less important as the mass of the alkali increases. A comparison of the rovibrational properties deduced from our calculations with experimental measurements recorded for NaKr and NaXe shows the quality of the calculations.

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Section: Excited Statesmentioning

confidence: 61%

Section: Introductionmentioning

confidence: 99%

Potential energy curves and spin-orbit coupling of light alkali-heavy rare gas molecules

Galbis

Douady

Jacquet

et al. 2013

The Journal of Chemical Physics

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“…While excited states of excimer molecules can possess substantial binding, the ground states are very weakly bound and possess only very shallow van der Waals minima at large internuciear separations. Weakly bound NaNe and NaAr molecules, 7,8 which are of this type, have been produced in supersonic beams, and their A ^ -X 2 S + and B 2 S + -X 2 S + transitions studied in detail. These experiments, however, represent the exception; excimer molecules have by and large not been studied by conventional high-resolution absorption or fluorescence techniques.…”

Section: D Haveymentioning

confidence: 99%

“…1, which illustrates the interatomic potentials for LiHe, and to the description which follows. Mixtures of ground-state atomic 7 Li and He are produced in an experimental cell which consists of a 250-cm 3 Pyrex bulb mounted with a 10-mm-o.d. quartz sidearm.…”

Section: D Haveymentioning

confidence: 99%

Laser Spectroscopy of the3d2Δ←2p2ΠTransition in Molecular LiHe

Havey

1982

Phys. Rev. Lett.

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Observations are reported on the rotationally resolved 3d 2 £-2p 2 n electronic transition in the LiHe van der Waals molecule. These observations, which represent the first optical double-resonance measurements of the rovibrational structure of any alkalirare-gas molecule, have been analyzed, using standard techniques, to yield values for the 3d 2 A state well depth D e = 430(70) cm" 1 and equilibrium separation r e = 3.6(l)a 0 . The experimental scheme, which should allow spectroscopy of excited states in a number of excimer molecules, is also described.PACS numbers: 33.20.Kf, 35.20.Pa In this Letter I report my studies of rotationally resolved structure in excited states of the LiHe van der Waals molecule. 1 A number of rotationvibration bands originating from the LiHe 2p ^ electronic state have been observed in the vicinity of the 2p-3d transition in atomic Li. On the basis of their rotational structure I attribute these bands to transitions to 2 £, ^ and 2 A molecular states correlating with atomic Li 3p and 3d states and ground-state He. A preliminary analysis of a portion of the spectrum has yielded values for the well depth and Li-He equilibrium separation in the 3d 2 A state.The alkali-rare-gas (A-R) pairs have long served as model systems in which to study a wide range of elastic and inelastic atomic collision processes. 2 " 8 The interatomic potentials are the most important physical quantities in considerations of such processes, and a good deal of effort has gone into devising methods of computing them. 3 " 6 The lowest two states of the A-R molecules have been extensively studied, and interatomic potentials determined for most A-R pairs. 2 However, experimental data on more highly excited states are sparse, and lead largely to only qualitative conclusions concerning the interaction potentials in these states. Analysis of rotationalvibrational structure provides the best experimental means of learning the potentials. The present measurements represent the first observations of such structure in states above the lowest electronically excited state in any A-R molecule. As such, they will ultimately lead to a good deal of spectroscopic information, including the interaction potentials, on highly excited states of a number of A-R molecules. The potentials generated from these data will provide guidance for theoretical calculations of the weak excited-state interactions in these molecules.The present measurements also illustrate application of a technique which will permit highresolution spectroscopic studies of a variety of excimer molecules. While excited states of excimer molecules can possess substantial binding, the ground states are very weakly bound and possess only very shallow van der Waals minima at large internuciear separations. Weakly bound NaNe and NaAr molecules, 7,8 which are of this type, have been produced in supersonic beams, and their A ^ -X 2 S + and B 2 S + -X 2 S + transitions studied in detail. These experiments, however, represent the exception; excimer molecules have by and la...

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“…Experiments with high angular-and velocity-resolutions allow to find the well depth e and the equilibrium distance 5, of the potential with an accuracy better than 1%. c) RKR potential curves determined experimentally from spectroscopic investigations of Van der Waals molecules [8][9][10][11][12]. b) model potentials, which were calculated by using various experimentally determined quantities, e.g.…”

Section: Introductionmentioning

confidence: 99%

Differential cross section measurements for Na-Ar and Na-Ne scattering: A test of interaction potentials

et al. 1983

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Global analysis of the NaNe excimer band systems: A molecule between Hund’s cases

Cited by 56 publications

References 39 publications

Potential energy curves and spin-orbit coupling of light alkali-heavy rare gas molecules

Potential energy curves and spin-orbit coupling of light alkali-heavy rare gas molecules

Laser Spectroscopy of the3d2Δ←2p2ΠTransition in Molecular LiHe

Differential cross section measurements for Na-Ar and Na-Ne scattering: A test of interaction potentials

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