Chemical reactivities of spin-orbit states of Al atoms: a fluorescence imaging study of the Al+O2 reaction

Kuo-mei Chen; Jia-lin Chang; Chun-hwa Sung; Teng-hui Chung; Kuo-huei Lee

doi:10.1117/12.220835

18 September 1995 Chemical reactivities of spin-orbit states of Al atoms: a fluorescence imaging study of the Al+O₂ reaction

Kuo-mei Chen, Jia-lin Chang, Chun-hwa Sung, Teng-hui Chung, Kuo-huei Lee

Author Affiliations +

Proceedings Volume 2548, Laser Techniques for State-Selected and State-to-State Chemistry III; (1995) https://doi.org/10.1117/12.220835
Event: SPIE's 1995 International Symposium on Optical Science, Engineering, and Instrumentation, 1995, San Diego, CA, United States

Abstract

A crossed beam chemical reaction, Al(²P_{1/2, 3/2}) plus O₂(X ³(Sigma) _g^-) yields AlO(X ²(Sigma) ⁺) plus O(³P_j), has been investigated by fluorescence imaging techniques. It has been found experimentally that only the ground spin-orbit state, i.e., Al atoms in the ²P_1/2 level are reactive towards O₂ molecules. An electrostatic interaction model is examined to reveal the dynamics in the region of large separation between the two reactants. It is shown that Al atoms in the ²P_3/2 spin-orbit state experience repulsive potential energy surfaces and are non-reactive. In the entrance valley of the allowed channel, Al atoms in the ²P_1/2 spin-orbit state are governed by a barrierless, attractive potential energy surface. From the microscopic mechanism of the Al plus O₂ reaction, its activation energy has been calculated to be -0.19 kcal/mol, in accordance with experimental measurements.

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Kuo-mei Chen, Jia-lin Chang, Chun-hwa Sung, Teng-hui Chung, and Kuo-huei Lee "Chemical reactivities of spin-orbit states of Al atoms: a fluorescence imaging study of the Al+O₂ reaction", Proc. SPIE 2548, Laser Techniques for State-Selected and State-to-State Chemistry III, (18 September 1995); https://doi.org/10.1117/12.220835

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