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The Journal of Chemical Physics

Collisional quenching of Pb 6p2 3P1 and 6p2 3P2 metastables by ground state Pb atoms

Christopher Reiser, Nicholas Djeu, R. D. Burnham

Published Mar 1, 1982• 2 citations
Publisher

Abstract

Collisional quenching of the two lowest Pb atom metastable levels, 6p2 3P1 and 6p2 3P2, has been studied at Pb vapor densities of (1–20)×1016 cm−3. The metastable atoms were created in a heat pipe oven by stimulated Raman scattering using an XeCl laser pump. Their subsequent decay was then probed with tunable, single-frequency UV on the 266.3 and 261.4 nm Pb resonance lines. The observed rate constants are 2.0×10−13 cm3 sec−1 for 3P1 and 3.2×10−13 cm3 sec−1 for 3P2.

DOI
10.1063/1.443305

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Collisional quenching of the two lowest Pb atom metastable levels, 6p2 3P1 and 6p2 3P2, has been studied at Pb vapor densities of (1–20)×1016 cm−3. The metastable atoms were created in a heat pipe oven by stimulated Raman scattering using an XeCl laser pump. Their subsequent decay was then probed with tunable, single-frequency UV on the 266.3 and 261.4 nm Pb resonance lines. The observed rate constants are 2.0×10−13 cm3 sec−1 for 3P1 and 3.2×10−13 cm3 sec−1 for 3P2.
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.
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
The relaxation of 6 3P0 mercury atoms excited by a laser pulse was measured for densities ranging from 2×1017 to 8×1018 cm−3. The decay of the 253.7 nm resonance line was also measured for densities ranging from 5×1016 to 1018 cm −3. The decay coefficients were analyzed to yield rate coefficients for three body molecular formation, the 3P1→3P0 collision rate and a collisional quenching rate for the 3P0 state. Small loss rates due to diffusion and radiation were also observed and found to be consistent with theoretical estimates of these quantities.
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.