The 4 1Σg+ "shelf" state of Na2 was extensively investigated using optical-optical double resonance spectroscopy and an ultrasensitive ionization detector. A total of 179 vibrational levels-(0≤v≤127 are from previous work by using filter-photomultiplier tube fluorescence detection) were observed in this state, which covered more than 99.8% of the well depth. The Rydberg-Klein-Rees (RKR) potential energy curve was constructed with maximum outer turning point R 178+ = 17.60 Å. The comparison of the long range portion of the RKR potential energy curve and the potential curve calculated from V(R) = ΣnCn/Rn is discussed. Avoided crossings around the shelf with the 3 1Σg+ state and near dissociation with the 5 1Σg+ state are also discussed.
All Science Journal Classification (ASJC) codes
- Physics and Astronomy(all)
- Physical and Theoretical Chemistry