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Ultrathin liquid sheets: water gets in shape for VUV absorption
Jonas Knurr1, Patrick Hemberger1, Patrick Ascher1
1Paul Scherrer Institut, CH-5232, Villigen PSI, Switzerland. andras.boedi@psi.ch.
Physical Chemistry Chemical Physics : PCCP
|February 24, 2025
Summary
Researchers studied water
Area of Science:
- Physical Chemistry
- Materials Science
- Spectroscopy
Background:
- Traditional liquid spectroscopy methods are limited by transmission windows.
- Vacuum ultraviolet (VUV) spectroscopy offers insights into electronic structures but requires specialized sample environments.
Purpose of the Study:
- To develop and validate a novel method for obtaining VUV absorption spectra of thin liquid sheets.
- To investigate the influence of interference effects on VUV spectra of ultrathin water films.
Main Methods:
- Utilized a gas-squeezed liquid jet to create free-flowing, ultrathin water sheets (20-50 nm).
- Recorded VUV absorption spectra without transmission windows.
- Employed a Fresnel propagation model to account for thin-film interference effects.
Main Results:
- Successfully obtained VUV absorption spectra of liquid water sheets at near-supercooled temperatures (0 ± 3 °C).
- Demonstrated that interference significantly impacts VUV spectra of thin liquid films.
- Developed a method to deconvolute interference from electronic structure contributions.
Conclusions:
- The gas-squeezed liquid jet technique enables VUV spectroscopy of liquids without window limitations.
- Accurate interpretation of VUV spectra requires accounting for thin-film interference.
- This technique facilitates the study of solvation and interfacial phenomena via valence band spectroscopy.
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