Temperature evolution in IR action spectroscopy experiments with sodium doped water clusters.

Area of Science:

• Physical Chemistry
• Spectroscopy
• Computational Chemistry

Background:

• Supersonic expansions and IR action spectroscopy are key for studying cluster structure and dynamics.
• Temperature's role in cluster synthesis and dynamics after IR excitation is crucial.
• Previous work successfully used sodium doping with IR-enhanced photoionization for neutral water clusters.

Purpose of the Study:

• To examine the interplay between cluster temperature and structure during cooling and IR excitation.
• To understand temperature evolution from cluster formation to detection.
• To investigate the impact of IR excitation on cluster heating and sodium solvation.

Main Methods:

• Employed molecular simulations to study temperature-dependent photoionization spectra.
• Analyzed evaporative cooling via water molecule ejection from cluster surfaces.
• Utilized IR action spectroscopy combined with sodium doping and photoionization.

Main Results:

• Provided constraints on temperature evolution during the cluster's journey to the mass spectrometer.
• Attributed the IR action effect to temperature-dependent sodium solvation in excited clusters.
• Observed geometry changes during IR multi-photon absorption.

Conclusions:

• The study offers a comprehensive analysis of temperature effects on cluster structure and dynamics.
• Findings highlight the significance of temperature-dependent sodium solvation in IR-excited clusters.
• Discussed potential applications of the method, considering geometry changes during IR absorption.