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Acta Physica Sinica

激发态Na(3P)原子的碰撞缔合电离

沈异凡, 李万兴

Published Jul 10, 2005• 0 citations
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Abstract

用染料激光照射温度为250℃的Na蒸汽,将基态Na原子激发到3P态,两个Na(3P)原子碰撞,产生缔合电离,测量了缔合电离截面。本实验的关键是激发态原子密度及其空间分布的确定。本文用三种不同的方法测定Na(3P)原子密度,并仔细地研究了它们的空间分布;结合电离电流的测量,得到了缔合电离截面σ Al =4.2×10 -17 cm 2 (±36％)。与其它实验结果作了比较,并进行了讨论。

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用染料激光照射温度为250℃的Na蒸汽,将基态Na原子激发到3P态,两个Na(3P)原子碰撞,产生缔合电离,测量了缔合电离截面。本实验的关键是激发态原子密度及其空间分布的确定。本文用三种不同的方法测定Na(3P)原子密度,并仔细地研究了它们的空间分布;结合电离电流的测量,得到了缔合电离截面σ Al =4.2×10 -17 cm 2 (±36％)。与其它实验结果作了比较,并进行了讨论。
The dencity of sodium was determined from measurement of optical absorption of the resonance line. Sodium vapour, in the dencity 3×10~(11) to 1.2×10~(12)cm~(-3), was excited by a cw dye laser, tuned 70 GHz from D_2 resonance line. We recorded signal intensities, consisting of The Rayleigh component at the laser frequency and the two fluorescence components (direct and sensitized) at the atomic resonance-line frequencies. D_2 line self-broadening rate coefficient [k_(br,2)=5.44×10~(-7)cm~3/s(±15%)] was yielded. Combined with the effective radiative decay rates in the presence of radiation trapping, we measured excitation-transfer rates in different dencities, for the excitation transfer process Na(3P_(3/2))+Na(3S) Na (3P_(1/2))+Na(3S). The fine-structure collisional-mining cross section [σ_(21)(3P_(3/2)→3P_(1/2))=19.9nm~2(±29%)3 at T 184℃ was obtained. Our results were compared to other experiments and to theory.