Rovibrationally resolved lifetime of the 6sSg(v=40,J) state molecular sodium

Alkali molecules and investigations of their structures and dynamics of short range interactions are important for ultracold molecular physics. This is because ultracold molecules have been used to probe new states of quantum matter, molecule lasers, and to improve precision measurements of fundamental constants. Due to the exotic behavior of the 6sSg(3s+5s) symmetry with double well structure, studying the radiative properties of this state becomes especially important. This work deals with the experimental and and theoretical studies of the 6sSg(v=40, J=23-25) state of sodium diatomic molecules in collaboration with Professors Ashman of Providence College and Faust of Susquehanna University. We used two-step double resonance technique for excitation and photon-counting technique for detection. Molecules are resonantly excited from the two pulsed lasers at 574.54 nm and 561.67 nm to follow XsSg(7,23) - AsSu(37,24) - 6sSg(40,23) excitation channel. Spectrometer is used as a filter to select specific molecular fluorescence peak, then the peak was directed to the pmt-multichannel analyzer to measure the 6sSg(40,23) state lifetime.