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Shock and vibration 2021, 1 - 11 (2021). doi:10.1155/2021/8825142, Published by IOS Press, Amsterdam

Acta materialia 184, 187 - 198 (2020). doi:10.1016/j.actamat.2019.11.037, Published by Elsevier Science, Amsterdam [u.a.]

6 pags., 4 figs., The fast evaporative cooling ofmicrometer-sizedwater droplets in a vacuumoffers the appealing possibility to investigate supercooled water—below the melting point but still a liquid—at temperatures far beyond the state of the art. However, it is challenging to obtain a reliable value of the droplet temperature under such extreme experimental conditions. Here, the observation of morphology-dependent resonances in the Raman scattering from a train of perfectly uniform water droplets allows us to measure the variation in droplet size resulting from evaporative mass losses with an absolute precision of better than 0.2%. This finding proves crucial to an unambiguous determination of the droplet temperature. In particular, we find that a fraction of water droplets with an initial diameter of 6379 12 nm remain liquid down to 230.6 0.6 K. Our results question temperature estimates reported recently for larger supercooled water droplets and provide valuable information on the hydrogen-bond network in liquid water in the hard-to-access deeply supercooled regime., This work was in part supported by Bundesministerium für Bildung und Forschung through Grant No. 05K13RF5.