Long range potential of the A1∑+u state of Na2 using modulated gain spectroscopy

The long range potential of the Na2 A1∑+u state has been investigated by studying various properties of the excited vibrational levels that it supports. Many high lying rovibrational levels in the range J’=10, 12, v’=43‐105 have been observed using the technique of Modulated Gain Spectroscopy. This has allowed us to characterize the intramolecular to a maxium intranuclear separation of 10.7 A) using an RKR inversion procedure.