High sensitivity measurement and accurate analysis of the vibrational spectroscopy near the (6S _(1/2) + 6P _(3/2)) dissociation limit for 1g state of Cs _2

摘要

The photoassociation spectroscopic data of the long-range molecular 1g state of Cs _2 in the asymptotic range red detuned [-5.02, - 2.45 cm ~(-1)] to the (6S _(1/2) + 6P _(3/2)) dissociation limit detected using photon counting technique are presented and 18 new high-lying vibrational energy levels are obtained. Fitting experimental data to the improved LeRoy-Bernstein (LRB) formula, we have obtained the long-range molecular coefficient C _3 with a high precision and also demonstrated the necessity of the improved LRB formula for more precise C3 coefficient by analyzing the residual from fitting procedure.