Accurate Potential Curve for the Double Minimum 21Σ+ State of Na2

Pashov, A.; Jastrzębski, W.; Jaśniecki, W.; Bednarska, V.; Kowalczyk, P.

doi:10.1006/jmsp.2000.8181

Cited by 32 publications

(11 citation statements)

References 16 publications

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“…We decided to refine the fitted potential using the inverted perturbation approximation ͑IPA͒ method. 57,58 IPA is an iterative approach that attempts to find a potential V͑R͒ such that the calculated rovibrational level energies, E calc ͑v , N , J = N͒, agree with the experimentally measured energies in the least squares sense. We recently described our implementation of this method 4 using the publicly available IPA code, 58 slightly modified to make use of subroutines from the program LEVEL 59 to calculate the rovibrational level energies.…”

Section: The Nak 1 3 ⌬ Potential and Long-range Behaviormentioning

confidence: 99%

The NaK 1Δ1,3 states: Theoretical and experimental studies of fine and hyperfine structure of rovibrational levels near the dissociation limit

Wilkins

Morgus

Hernandez-Guzman

et al. 2005

The Journal of Chemical Physics

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Earlier high-resolution spectroscopic studies of the fine and hyperfine structure of rovibrational levels of the 1 3delta state of NaK have been extended to include high lying rovibrational levels with v < or = 59, of which the highest levels lie within approximately 4 cm(-1) of the dissociation limit. A potential curve is determined using the inverted perturbation approximation method that reproduces these levels to an accuracy of approximately 0.026 cm(-1). For the largest values of v, the outer turning points occur near R approximately 12.7 angstroms, which is sufficiently large to permit the estimation of the C6 coefficient for this state. The fine and hyperfine structure of the 1 3delta rovibrational levels has been fit using the matrix diagonalization method that has been applied to other states of NaK, leading to values of the spin-orbit coupling constant A(v) and the Fermi contact constant b(F). New values determined for v < or = 33 are consistent with values determined by a simpler method and reported earlier. The measured fine and hyperfine structure for v in the range 44 < or = v < or = 49 exhibits anomalous behavior whose origin is believed to be the mixing between the 1 3delta and 1 1delta states. The matrix diagonalization method has been extended to treat this interaction, and the results provide an accurate representation of the complicated patterns that arise. The analysis leads to accurate values for A(v) and b(F) for all values of v < or = 49. For higher v (50 < or = v < or = 59), several rovibrational levels have been assigned, but the pattern of fine and hyperfine structure is difficult to interpret. Some of the observed features may arise from effects not included in the current model.

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Section: The Nak 1 3 ⌬ Potential and Long-range Behaviormentioning

confidence: 99%

The NaK 1Δ1,3 states: Theoretical and experimental studies of fine and hyperfine structure of rovibrational levels near the dissociation limit

Wilkins

Morgus

Hernandez-Guzman

et al. 2005

The Journal of Chemical Physics

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“…Experimental and calculated radiative lifetimes reported in this work have been compared and the results were in reasonable agreement. To validate our measurements and the techniques, we also measured the radiative lifetime of the A 1 Σ + u (8,30) state by extrapolating the Stern-Volmer plot to zero pressure. The result is in good agreement with the literature values within the experimental uncertainties.…”

Section: Resultsmentioning

confidence: 99%

“…The dipole selection rules allow spontaneous emission from the 6 1 Σ + g (v, J) (Tsai et al 14 and Laue at al. 17 ) to seven electronic potentials: 1(A) 1 Σ + u from Tiemann et al 27 , 1(B) 1 Π + u from Comacho et al 28 and Tiemann et al 29 , 2 1 Σ + u from Pashov et al 30 , 2 1 Π + u from Grochola et al 31 , 3 1 Σ + u 32 , 3 1 Π + u from Grochola et al 33 , and 4 1 Σ + u from Grochola et al 34 . The potentials and transition dipole moment functions for the seven dipole allowed transitions from the 6 1 Σ + g (v, J) state are shown in Fig.…”

Section: Theoretical Calculationsmentioning

confidence: 99%

Time-resolved double-resonance spectroscopy: Lifetime measurement of the $6\,^1Σ_g^+(7,31)$ electronic state of molecular sodium

Saaranen,

Wagle,

McLaughlin

et al. 2018

Preprint

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We report on the lifetime measurement of the 6 1 Σ + g (7, 31) state of Na 2 molecules, produced in a heat-pipe oven, using a time-resolved spectroscopic technique. The 6 1 Σ + g (7, 31) level was populated by two-step two-color double resonance excitation via the intermediate A 1 Σ + u (8, 30) state. The excitation scheme was done using two synchronized pulsed dye lasers pumped by a Nd:YAG laser operating at the second harmonics. The fluorescence emitted upon decay to the final state was measured using a time-correlated photon counting technique, as a function of argon pressure. From this the radiative lifetime was extracted by extrapolating the plot to collisionfree zero pressure. We also report calculated radiative lifetimes of the Na 2 6 1 Σ + g ro-vibrational levels in the range of v = 0 − 200 with J = 1 and J = 31 using the LEVEL program for bound-bound and the BCONT program for bound-free transitions. Our calculations reveal the importance of the bound-free transitions on the lifetime calculations and a large difference of about a factor of three between the J = 1 and J = 31 for the v = 40 and v = 100, due to the wavefunction alternating between having predominantly inner and outer well amplitude.

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“…On the other side, a wealth of experimental information has been gathered on numerous molecular systems, including data on molecular Rydberg states (e.g. [1,2]), electronic states with double minimum and ''shelf'' potentials [3][4][5], behavior of molecules near dissociation limits (studied by spectroscopic approach [6] as well as by photoassociation of cold atoms [7][8][9][10]), etc.…”

Section: Introductionmentioning

confidence: 99%