A new method for instantaneous temperature field measurements based on LIF studies of OH, O(2), and H(2)O in an open atmospheric flame with a tunable excimer laser is suggested. In this method the crucial problem of quenching at higher pressures is almost completely eliminated by excitation to a fast predissociating state. The various possible excitation and fluorescence processes that can be induced in the narrow tuning range of the KrF laser are characterized experimentally by excitation and dispersion spectra for the three molecules OH, O(2), and H(2)O. Of particular importance is the large power of the KrF laser, which allows efficient excitation of even weak transitions. The fast predissociation of these molecules in connection with the powerful excitation laser suggests that instantaneous temperature field measurements should be possible at higher pressures.
For the systems Na(3 2P3/2)Ar, NaKr, and NaXe we have measured the total differential cross sections at thermal energies. All systems show a well resolved oscillation structure of the cross sections. For these data quantum mechanical calculations have been performed based on pseudopotentials (for NaAr), and calculations in the elastic WKB approximation using a Lennard-Jones (8,6) potential (for NaAr, NaKr, and NaXe). The results allow us to determine the interatomic potentials with high accuracy. A comparison is made by a detailed listing of experimental and theoretical results published up to now.
Application of the cross correlation chopper technique to the measurement of a time-of-flight (TOF) spectrum of excited atoms by modulation of the exciting laser light is described. The principle and the practical aspects are discussed in a comparison with mechanical systems. Results are given for angular resolved scattering of excited sodium from potassium.
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