【作者】 李媛媛；

【导师】 沈异凡；

【作者基本信息】 新疆大学 ， 原子与分子物理， 2005， 硕士

【摘要】 准分子激光器在光化学,同位素分离以及需要高效率、强紫外光源的场合,是颇为重要的辐射源。而寻找可形成粒子数反转的工作能级是制作这种激光器的关键。除了惰性气体外,对碱分子的研究也成为了热点之一。所以获得激发态碱分子的碰撞去布居、预离解率及碰撞转移的实验数据是研制这种新型激光器的必要条件。本文利用激光感生荧光光谱技术,研究了碱金属钠、铷和铯的部分碰撞能量转移过程,给出了相应的转移速率系数和碰撞截面值:(1)在360℃,根据辐射衰变率和荧光强度得到Na2(B1Πu)到Na2(21Σg )碰 + 撞转移率系数为7.1×10-10cm3s-1,而B1Πu的预解离率为2.3×106s-1。(2)由相对荧光强度得到了Rb 的精细结构转移截面σ(5P3/2→5P1/2)=(3.0±0.9) ×10-15cm2。(3)通过激发转移、能量碰撞合并和Cs2-Cs 碰撞传能研究了62P 原子的精细结 构混合,得到了6P3/2→6P1/2碰撞转移速率系数是(5.2±2.1)×10-11cm3s-1, 给出了过程Cs2(B1∏u)+Cs(6S)→Cs2(X1Σg )+Cs(6P1/2) 的速率系数是 (1.0±0.4)×10-9cm3s-1。并与其他实验结果进行了比较。同时,在研究重碱原子共振能级(如铷,铯)的精细结构混合率时,考虑了碰撞能量合并过程的影响,提高了测量的精度。更多还原

【Abstract】 Dimmer laser is a very important radiation source to photochemistry ,separating isotope and the place where high-power 、strong ultravioletlight source is needed . In order to make this laser , it is key to lookfor energy levels which can make the particle reverse . Besides inertiagas , alkali molecules have been much interest .So it is necessary toobtain the excited states data of alkali molecules such as collisionaldepopulation ,predissociation and collisional transfer rates .In this thesis, we acquire some values of collisional transfer rate ,and cross section by the technique of laser induce fluorescencespectroscopy :(1) From the decay constants and fluorescence intensities ,the ratecoefficient at 360℃for collisional energy transfer from Na2(B1Πu) toNa2(21Σ+g )is 7.1×10-10 cm3S-1.The predissociation rate of the B1Πu is2.3×106 S-1.(2) Measurement of relative intensities of the two Rb components yieldedthe following cross section: σ(5P3/2→5P1/2) =(3.0±0.9)×10-15cm2.(3) The fine-structure mixing in 62P atoms is studied through excitationtransfer ,energy-pooling collision and collisional excitation transferbetween Cs2 and Cs .We estimated the value of rate coefficient forcollisional energy transfer from 6P3/2 to 6P1/2 to be(5.2±2.1)×10-11cm3s-1 .For the excitation transfer process : Cs2(B1∏u) + Cs(6S) →更多还原