Experimental Study of the NaK 31Π State

Potential Energies, Permanent and Transition Dipole Moments for Numerous Electronic Excited States of NaK

“…With the new points considered at short R, we have improved previous results. Good agreement is obtained with recent experimental data of Huennekens and co-workers (15,17) and those of the Kowalczyk-Jastrzebski's group (16,18) obtained for various highly excited states for which the poten- 3 ⌸ Electronic States tial energy curves can have curious patterns due to avoided crossings at short R or to ionic covalent interactions at large internuclear distance. We note that a disagreement remains between experiment and theory for the c 3 ⌺ ϩ (3p ϩ 4s) state, although new spectroscopic constants have been determined by Kowalczyk and Sadeghi (7).…”

“…This difference may be due mainly to strong perturbations with B 1 ⌸ and b 3 ⌸ electronic states correlated to Na(3s) ϩ K(4p). From their measurements, Laub et al (17) have deduced the variation of the dipole moment with interatomic distance, for the X 1 ⌺ ϩ 3 3 1 ⌸ transition. A comparison with present results and with previous ab initio calculations (19) is displayed in Fig.…”

“…From their measurements, Laub et al (17) have deduced the variation of the transition dipole moment as a function of internuclear distance R, for the transition X 1 ⌺ϩ 3 (3) 1 ⌸. Their results are in disagreement with the previous ab initio calculations of Ratcliff et al (19), although theoretical and experimental variations with R have the same pattern at large internuclear distances, i.e., the transition dipole moment decreases with increasing R. Moreover, with the development of ultrafast and intense laser pulses, photodissociation and photoionization of small alkali dimers may be henceforth observed (20) and their interpretation requires the knowledge of transition dipole moments.…”

Potential Energy Curves of Some Electronic Excited States of Metal Diatomic Molecules Using the Energy Consistent Method

“…1, the ECM(3) potential with N ϭ 3 for the electronic excited state 3 1 ⌸ of NaK is compared with the RKR data (E, Laub et al (12); , Pashov et al (13)). The ECM(3) potential (--) agrees excellently to the accurate RKR data and is much better than both the HMS (---) and the Morse potentials ( .…”

“…[12] for a physical potential will be satisfied. Function ⌳(R) plays another important role that it scales the potential changes [V MS (R) Ϫ V M (R)] in Eq.…”