Measurement and theoretical evaluation of cross section for Na(4D) + Na(3S) →Na(4F) + Na(3S)

摘要

Cross section σ4D-→4F was measured for the collision transfer process of Na(4D) + na(3S) →Na(4F) + Na(3S). The 4D state is excited by two-photon absorption using a tunable dye laser. Since the 4F→3D fluorescence can not be detected directly with the apparatus used the cascade 3D→3P fluorescence is monitored instead. Then the cross-section σ4D → 4F =(1.3 ±0.3) X 10~14 cm~2 is got from the relative intensity of the fluorescence.