Unveiling photon-driven nonlinear evaporation via liquid drop interferometry.

Area of Science:

• Physics
• Physical Chemistry
• Surface Science

Background:

• Thermal evaporation is the primary mechanism for water loss from droplets.
• Precisely isolating photon-induced evaporation from thermal effects has been challenging.
• Understanding non-thermal evaporation pathways is crucial for various applications.

Purpose of the Study:

• To investigate and characterize photomolecular-induced evaporation at water-vapor interfaces.
• To overcome the limitations of thermal evaporation in studying photon-driven processes.
• To identify key indicators and surface phenomena associated with photomolecular evaporation.

Main Methods:

• Utilized Liquid Drop Interferometry (LDI) to monitor evaporating water drops.
• Employed a partially metallic polished prism to generate standing waves at the air-water interface.
• Applied noninvasive measurements to detect transient deformation height.

Main Results:

• Observed near-total internal reflection, indicating a nonlinear increase in evaporation due to photomolecular effects.
• Demonstrated that photomolecular-induced evaporation is a surface phenomenon, enhanced at wave maxima.
• Identified transient deformation height as a critical indicator of photon-induced cluster breaking and enhanced evaporation.

Conclusions:

• Photomolecular-induced evaporation offers a novel pathway for water cluster cleavage, distinct from thermal processes.
• LDI and standing wave techniques successfully isolated and validated photomolecular evaporation.
• Transient deformation height serves as a key metric for quantifying photon-induced evaporation effects on water droplets.