Line Shapes of High Resolution Photoassociation Spectra of Optically Cooled Atoms

摘要

High resolution photoassociation spectra of colliding ultracold trapped atomscontain detailed information about ground and excited state interactions. We calculate the asymmetric line shapes for ultracold Na2 absorption using a resonance scattering expression, proportional to a free-bound Franck-Condon factor, that is justified by full quantum scattering calculations of a collision in a radiation field. The line shapes illustrate Wigner threshold law behavior, which is characteristic of the quantum limit as T--> 0. Using an adiabatic hyperfine analysis, we calculate and compare a model spectra for J = 1, 2, 3, and 4 features of the Na2 (1) Pi (sub g)(v=48) state to recent high resolution experimental data. jg p.2.