Collisional Energy Transfer And Fine--structure Mixing Of Alkali Molecules

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) →...