(Color online) Theoretical potential energy curves of the ground state and low-lying excited electronic states of the NaCs molecule as calculated in Ref. 9 ( states are not shown). The energy scale is referred to the minimum of the ground state potential.
NaCs LIF spectrum: (a) to the ground singlet and triplet states from (, ) level of the state excited with laser line from (, ) ; (b) to the singlet ground state only, from (, ) level of the state excited with laser line from (, ) .
(Color online) Plot of the state experimental term energies against . Solid lines depict the term energies calculated with IPA potential. Full circles show term energies obtained from transitions from to singlet ground state. Open triangles show term energies obtained from transitions to singlet and triplet ground states (term value with is not shown).
(Color online) -factors of the state of the NaCs molecule: (a) for , (c) for (-factors with anomalous behavior are marked with open circles). The difference between observed and calculated (from the IPA potential) term energies are drawn for (b); (d) (-levels: circles, -levels: triangles). Note that the energy difference scale in (b) is enlarged with respect to (d).
(Color online) Comparison of the present state empirical PEC (solid line, clearly distinguished in the insert) with the corresponding theoretical PECs. Vertical bar shows the outer turning point corresponding to the highest observed level , . values for theoretical PECs are different from the ones given in Refs. 9 and 34 and in Table V (see text).
List of NaCs state -factors averaged over given intervals. Larger scatter for is caused by perturbations. The values and the uncertainties for indicate that the data for and levels outside the regions of local perturbations are not sufficient for getting significant values.
List of the , levels of the state used for PEC construction.
List of the grid points of the potential energy for the NaCs state. Energies are given with respect to the minimum of the ground state (Ref. 8). The NaCs reduced mass used is (Ref. 33). The values for are obtained by IPA while the points for are based on theoretical PEC (Ref. 9) (see text).
Dunham parameters (in ) of the NaCs state for and . is calculated. Deviations at local perturbations should be expected. Dunham parameters were rounded by a procedure which is described in Ref. 32
Comparison of the present experimental and theoretical (ab initio and difference based) (Refs. 9, 12, 34, and 35) molecular constants (in ), (in Å), (in ), and (in ) for the state of NaCs molecule. The experimental and difference based spectroscopic constants are obtained from the respective pointwise PECs.
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