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Acta Physica Sinica

PHOTODISSOCIATION OF PbCl2

Jie Zhang, CHENG BING-YING, Daozhong Zhang, WANG LI-HUA, Zhao Yuying, WANG TIAN-JUAN, 中国科学院物理研究所

Published Jan 1, 1988• 1 citation
Publisher

Abstract

The population on 6p2 3P2 metastable state and 6p2 3P0 ground state of Pb atoms are de-monstrated, which are originated from dissociating PbCl2 by the fourth harmonic of YAG lasers. The population ratio of 3P2 to 3P0 is measured in terms of laser-induced fluorescence. The results indicate that the dissociation of PbCl2 is a two photon process and the population inversion between 3P2 and 3P0 exists. The stimulated Raman radiation based on the population of 3P2 metastable state is observed. The possible way of dissociation is studied.

DOI
10.7498/aps.37.743

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The population on 6p2 3P2 metastable state and 6p2 3P0 ground state of Pb atoms are de-monstrated, which are originated from dissociating PbCl2 by the fourth harmonic of YAG lasers. The population ratio of 3P2 to 3P0 is measured in terms of laser-induced fluorescence. The results indicate that the dissociation of PbCl2 is a two photon process and the population inversion between 3P2 and 3P0 exists. The stimulated Raman radiation based on the population of 3P2 metastable state is observed. The possible way of dissociation is studied.
Strong stimulated radiations at wavelengths 3740 A have been observed when PbCl2 molecules are photodissociated by 2660 A ultraviolet laser. Dependences of these radiations on the pump laser intensity and PbCl2 molecular density have been studied experimentally. A theoretical model to describe these processes is put forward. These two raditions are identified as resonant laser radiation and stimulated Raman scattering originated from bhe population of the metastable level 6p23P2 of atomic Pb, which is produced by two-photon dissociation of PbCl2. When molecular density of PbCl3 is 6.21×1016cm-3, the maximum populations on the two metastable levels, 6p23 P2 and 6p21D2, of atomic Pb are almost same, which equals 2.0×1016cm-3.
Strong stimulated radiation at wavelengths 3740 A was observed when PbCl 2 molecules were photodissociated by a 2660 A UV laser. Based on spectral characteristics and Pb energy level structure, this radiation was judged to be resonant laser radiation and stimulated Raman scattering due to the populated 6p 2 3 P 2 metastable Pb atoms from photodissociated PbCl 2 molecules. A theoretical model was developed to describe the whole process, and experimentally fitted to determine the photodissociation coefficient of the metastable Pb atoms from dissociated PbCl 2 by 2660 A laser
Under excitation of 355nm or 266nm UV radiation some strong emissions have been observed in PbI 2 vapor. Analysis shows that they are 1st, 2nd order Stokes and 1st anti-Stokes components of 355nm laser and 1st order Stokes and anti-Stokes components of 266nm laser. The initial states of Raman transition are 6p 2 3 P 1 and 6p 2 3 P 2 metastable states of atomic Pb, respectively. The population on it is created by photodissociation of PbI 2 . The dependences of Raman components on pump power, PbI 2 density and pressure of buffer gas are investigated experimentally.
This paper reports the first time achievement of large population inversion between thallium 7 2S1/2 and 6 2P3/2 states through two-photon dissociation of pure Tl2 molecules. The second harmonic of a Nd–YAG laser at 532 nm is used to cause two-photon absorption in Tl2 from ground state Ou− to the repulsive state associated with the atomic 7 2S and 6 2P1/2 states. The relative population of the product atomic species is determined by using a tunable dye laser pumped by the third harmonic of a Nd–YAG laser. The dye laser beam focused for complete spatial and temporal overlap with the photodissociaiton pulse excites the product states to known atomic Rydberg states with subsequent ion detection. Prompt population inversion amounting to 100% is achieved. It is shown that photodissociation transition is mediated through predissociation of the upper bound state to a repulsive state correlated with Tl(7 S1/2) in the region of large internuclear separation.
A large number of Ti atoms populated mainly on the ground state (a3F2) and metastable states (a3F3,4) were produced by UV-laser (259-300 nm) photodissociation of TiCl4. Many stimulated Raman scattering lines and stimulated radiations of Ti atoms were observed by pumping Ti atoms on the a3F2,3,4 states via nearly resonant transitions. All the lines observed were assigned. The pulse duration and timeresolved spectrum of SRS of Ti atoms shows the photolysis of TiCl4 to Ti atom was very fast, and the time estimated for it was less than Ins.