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Comparative study of in situ N2 rotational Raman spectroscopy methods for probing energy thermalisation processes during spin-exchange optical pumping

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Comparative study of in situ N2 rotational Raman spectroscopy methods for probing energy thermalisation processes during spin-exchange optical pumping

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  • Author: Hayley Newton, Laura L. Walkup, Nicholas Whiting, Linda West, James Carriere, Frank Havermeyer, Lawrence Ho, Peter Morris, Boyd M. Goodson, Michael J. Barlow
We have implemented a new in-line Raman module for rapidly measuring local internal gas temperatures during SEOP. This apparatus, which obtains N2 rotational temperatures by probing the ultra-low frequency Stokes/antiStokes Raman lines, was shown to provide improvements in detection sensitivity (SNR increase *23-fold, with corresponding gains in spatiotemporal resolution), accuracy and precision in determining TN2 values, and ease of use compared to our previous orthogonal arrangement.

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