【摘要】 实验获得了Ar⁺激光488nm线诱导Na₂分子产生B¹Π_u→X¹Σ⁺_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B¹Π_u→X¹Σ⁺_g电子态跃迁。研究了钠蒸气温度对Na₂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B¹Π_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。更多还原

【Abstract】 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.更多还原