钠分子B^1Π_u→X^1Σ_g^+LIF光谱及其强度研究

A STUDY OF LIF SPECTRUM AND INTENSITY ON B^1Π_u→X^1Σ_g^+ BOND OF Na_2

实验获得了Ar^+激光488nm线诱导Na_2分子产生B^1Π_u→X^1Σ^+_g跃迁荧光谱,其谱线的跃迁机制是分属于不同Q、P、R支系列的较高转动能级的B^1Π_u→X^1Σ^+_g电子态跃迁。研究了钠蒸气温度对Na_2分子激光诱导荧光光谱强度的变化关系,表明是由于荧光跃迁的上下能级不同弛豫过程的影响。分析了缓冲气体Ar对Na_a分子B^1Π_u态的碰撞猝灭作用,得出谱线强度与总气压的等轴双曲线关系,所得数据拟合曲线与实验很好地一致。

In this Paper, the transitional mechanism of laser-induced fluorescence (LIF) spectrum of B^1Π_u→X^1Σ_g^+ band for sodium vapor by pumping of 488nm Ar^+ lasers has been analysed. The LIF spectrum belongs to different Q, P, R branches of eletron—state transition of high rotational levels respectively. The LIF spectrum intensities depending on the temperature of sodium vapor were measured experimentally. Through studying the quenching effect for B^1Π_u state by collision of buffer gas Ar the relation between intensities I and total pressure P in heat-pipe oven was obtained. Thus the I-P plot becomes equiaxial hyperbola, and fitted plot is in accordance with experimental data satisfactorily.