Polarized laser induced fluorescence of BaO (X 1Σ+) produced in a crossed‐beam reaction of Ba+SO2

Rotational alignment of the product BaO in the crossed‐beam reaction Ba+SO2→BaO+SO was studied as a function of collision energy. The collision energy was varied from 3.0 to 8.0 kcal/mol by changing the stagnation condition of the supersonic SO2 beam. The rotational alignment was probed by means of the polarized laser‐induced fluorescence (PLIF) of the product. The distribution of the rotational vector was isotropic at the collision energy of 3.0 kcal/mol, but anisotropic at a higher collision energy, with the most probable alignment being perpendicular to the relative velocity vector. These results indicate that the reaction proceeds via a long‐lived complex at a low collision energy, whereas at a higher collision energy, the lifetime of the complex is short enough to couple the rotational angular momentum to the total angular momentum.

[1]  T. Kasuya,et al.  Influence of reagent collision energy on the rotational distribution of BaO in the reaction of SO2 with Ba , 1986 .

[2]  T. Kasuya,et al.  Bimodal vibrational distribution of BaBr in the reaction Ba+CF3Br , 1984 .

[3]  K. Meiwes-Broer,et al.  Rotational polarization of product molecules: Crossed laser-molecular-beam studies of Ca* + HF and Ca + F2 , 1984 .

[4]  A. J. Bain,et al.  Complete determination of the state multipoles of rotationally resolved polarized fluorescence using a single experimental geometry , 1984 .

[5]  Y. Matsumi,et al.  Collision energy dependence of vibrational/rotational distribution of BaBr produced in the crossed beam reaction Ba+CH3Br , 1983 .

[6]  R. Zare,et al.  Determination of product population and alignment using laser‐induced fluorescence , 1983 .

[7]  R. Zare,et al.  Photofragment Alignment and Orientation , 1982 .

[8]  C. Rettner,et al.  Measurement of product alignment in beam–gas chemiluminescent reactions , 1981 .

[9]  J. Simons,et al.  Rotational alignment in inelastic and reactive scattering , 1980 .

[10]  R. Gottscho,et al.  Optical-Optical Double-Resonance Spectroscopy of CaF , 1980 .

[11]  R. Behrens,et al.  Crossed molecular beams kinetics: BaO recoil velocity spectra from spin‐forbidden Ba+SO2 , 1979 .

[12]  J. Simons,et al.  Crossed beam studies of chemiluminescent, metastable atomic reactions. Excitation functions and rotational polarization in the reactions of Xe(3P2,0) with Br2 and CCl4 , 1979 .

[13]  J. Simons,et al.  Rotational polarization in the chemiluminescent reaction Xe(3P0,2) + Br2 → XeBr* + Br , 1978 .

[14]  D. Case,et al.  Angular momentum polarization in molecular collisions : Classical and quantum theory for measurements using resonance fluorescence , 1978 .

[15]  R. Zare,et al.  Facile spin-forbidden reactions. Barium + sulfur dioxide .far. barium oxide + sulfur monoxide , 1975 .

[16]  D. Herschbach,et al.  Rotational polarization of reaction products analysis of electric deflection profiles , 1975 .

[17]  G. McClelland,et al.  Molecular beam kinetics: Angle‐angular momentum correlation in reactive scattering , 1974 .

[18]  U. Fano,et al.  Impact Excitation and Polarization of the Emitted Light , 1973 .

[19]  D. Herschbach,et al.  Rotational polarization of reaction products and reprojection of angular momentum , 1972 .

[20]  R. Zare,et al.  Crossed‐Beam Chemiluminescence Studies of Some Group IIa Metal Oxides , 1972 .

[21]  D. Herschbach.  Reactive collisions in crossed molecular beams , 1962 .

[22]  G. Herzberg.  Molecular Spectra and Molecular Structure IV. Constants of Diatomic Molecules , 1939 .