TEMPERATURE DEPENDENCE OF THE INFRARED SPECTROSCOPY OF OZONE IN SOLID $OXYGEN^{a}$

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1997

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Ohio State University

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Irradiation with ultraviolet laser light (210 to 250 nm) generates ozone monomers and dimers in a solid oxygen matrix. For wavelengths longer than 240 nm, we observe a dominant doublet structure for each fundamental vibration of ozone, $\nu_{1}, \nu_{2}$, and $\nu_{3}$, as observed in a lamp irradiation $study^{b}$. In addition, we identify a doublet feature for the combination band, $\nu_{1} + \nu_{3}^{c}$. With higher excitation energy we observe even more features, especially in the $\nu_{3}$ regin and attribute them to ozone dimers in the oxygen solid. While the aforementioned doublet structrures, for $\nu_{3}$ at $1037.8 cm^{-1}$ and $1030.9 cm^{-1}$ have been assigned to an ozone monomer and to a complex $O \ldots O_{3}$, $respectively^{a}$, our investigations indicate the latter feature is due to an ozone monomer isolated in an unstable lattice site. This conclusion results from detailed temperature studies of ozone-doped oxygen matrices. Furthermore, from the temperature dependence of the line position of the ozone monomer feature we observe the $\alpha-\beta$ phase transition of the solid oxygen host. The potential of this temperature shift as a novel temperature sensor for cryogenic matrices will be discussed.

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$^{a}$The support for this work by the Air Force Office of Scientific Research High Energy Density Matter Program is gratefully acknowledged. $^{b}$L. Schriver-Mazzuoli, A. do Saxe\'e, C. Lugez, and A. Schriver, J. Chem. Phys. 102, 690 (1995). $^{c}$M.J. Dyer, C.G. Bressler, R.A. Copeland, Chem. Phys. Lett. 266, 548 (1997).
Author Institution: Sri International

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