DETERMINATION OF THE A10 DISSOCIATION ENERGY BY A LASER FLUORESCENCE STUDY OF THE $A1 + O_{2}$ REACTION
Loading...
Date
1977
Authors
Journal Title
Journal ISSN
Volume Title
Publisher
Ohio State University
Abstract
The reaction of velocity selected A1 atoms with $O_{2}$ has been studied by laser-induced $fluorescence^{1}$ so that individual A10 internal states could be observed. Velocity-selection is achieved by a recently developed time-of-flight (TOF) $technique^{2}$ utilizing pulsed laser excitation. Spectra of the A10 B-X system have been taken at several A1 velocities, and the intensities of the $\Delta\nu = + 1$ band heads as a function of A1 velocity have also been measured. Using two different methods of analysis, we have arrived at a value of $D_{0}{^\circ (A10)} = 123 \pm 1$ kcal/mole. One method employs the excitation spectra to find the maximum internal energy of A10 formed, while in the other, the translational energy threshold for formation of v = 2 A10 is determined. The present value agrees well with previous determinations by other methods; moreover, the present experiment considerably narrows the permissible range of values for $D_{0}{^\circ (A10)}$.
Description
${^{1}}$ Studied previously with an unselected effusive A1 beam [P. J. Dagdigian, H. W. Cruse, and R. N. Zare, J. Chem. Phys. 62, 1824 (1975)]. ${^{2}}L$. Pasternack and P. J. Dagdigian, Rev. Sci. Instrum., March 1977 issue. Acknowledgment is made to the Donors of the Petroleum Research Fund, administered by the American Chemical Society, and to the National Science Foundation for support of this research.
Author Institution: Department of Chemistry, The Johns Hopkins University
Author Institution: Department of Chemistry, The Johns Hopkins University