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Journal Article

Optical Fluorescence Detected from X-ray Irradiated Liquid Water

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Pohl,  Marvin Nicolas
Helmholtz-Zentrum Berlin für Materialien und Energie, Methods for Material Development;
Department of Physics, Free University Berlin;
Molecular Physics, Fritz Haber Institute, Max Planck Society;

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Winter,  Bernd
Helmholtz-Zentrum Berlin für Materialien und Energie, Methods for Material Development;
Molecular Physics, Fritz Haber Institute, Max Planck Society;

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Citation

Hans, A., Ozga, C., Seidel, R., Schmidt, P., Ueltzhöffer, T., Holzapfel, X., et al. (2017). Optical Fluorescence Detected from X-ray Irradiated Liquid Water. The Journal of Physical Chemistry B, 121(10), 2326-2330. doi:10.1021/acs.jpcb.7b00096.


Cite as: http://hdl.handle.net/11858/00-001M-0000-002C-C997-3
Abstract
Despite its importance, the structure and dynamics of liquid water are still poorly understood in many apsects. Here, we report on the observation of optical fluorescence upon soft X-ray irradiation of liquid water. Detection of spectrally resolved fluorescence was achieved by a combination of the liquid microjet technique and fluorescence spectroscopy. We observe a genuine liquid-phase fluorescence manifested by a broad emission band in the 170–340 nm (4–7 eV) photon wavelength range. In addition, another narrower emission near 300 nm can be assigned to the fluorescence of OH (A state) in the gas phase, the emitting species being formed by Auger electrons escaping from liquid water. We argue that the newly observed broad-band emission of liquid water is relevant in search of extraterrestrial life, and we also envision the observed electron-ejection mechanism to find application for exploring solutes at liquid–vapor interfaces.