Na(4D)+Na(3S)Na(4F)+Na(3S)碰撞能量转移截面

CROSS SECTION MEASUREMENT FOR THE ENERGY TRANSFER COLLISION Na(4D)+Na(3S)Na(4F)+Na(3S)

利用双光子吸收,将Na(3S)原子激发到4D态,测量了Na(4D)+Na(3S)Na(4F)+Na(3S)碰撞能量转移截面,因为直接由4F→3D的荧光不能探测,所以检测3D→3P级联荧光讯号。结合基态钠原子密度的测量,给出了截面值σ_4D→4F=1.3 x 10^(-14)±28％(cm^2)。

We measured the cross section for the collision transfer process Na(4D)+Na (3S)Na(4F)+Na(3S). The 4D state was excited by two photon absorption using a tunable dye laser. Since the direct 4F→3D fluorescence can not be detected with our apparatus, we monitored instead the cascade 3D→3P and 4D→3P fluorescence. Relative intensity of the fluorescence, combined with the measurement of sodium density, yielded cross section σ_(4D)→(4F)=1.3×10^(-14)±28％(cm^2). Our result is compared to other experiments.