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Rotational and vibrational temperature determination by DFWM spectroscopy

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Abstract

Using the DFWM technique we determined rotational and vibrational temperatures of NaH molecules in a dynamical system consisting of NaH, Na, H and H2 for several heat-pipe oven temperatures. We applied a new way to determine the dependence of the DFWM signalI intc on the power of the transition dipole momentµ without previous knowledge of the temperature. The revealed dependence isI intc αµ 4. In this case the laser intensities were found to be of the same order as the saturation intensity in accordance with simple DFWM theory. A usual Boltzmann plot was employed for the determination of the relevant rotational temperatures, which displayed higher values than the oven temperature.

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Klamminger, A., Motzkus, M., Lochbrunner, S. et al. Rotational and vibrational temperature determination by DFWM spectroscopy. Appl. Phys. B 61, 311–318 (1995). https://doi.org/10.1007/BF01082052

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