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Measurement of molecular rotational temperature in a supersonic gas jet with high-order harmonic generation

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Abstract

We apply high-order harmonic generation to sensitive measurements of the molecular rotational temperature in a thin supersonic gas beam. The method uses nonresonant pump and probe femtosecond laser pulses to generate harmonic radiation from coherently rotating molecules. The rotational temperature of molecules can be derived accurately with high spatial and temporal resolutions from the Fourier spectrum of time-dependent signals. The validity of this method was tested for an expanding flow of an N2 beam with a rapid temperature decrease. The results show the versatile applicability of this method.

© 2009 Optical Society of America

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