Probing Intermolecular Interactions in Binary Liquid Mixtures Using Femtosecond Laser-Induced Self-Defocusing

Area of Science:

• Optics and Photonics
• Physical Chemistry
• Materials Science

Background:

• Understanding the photo-thermal behavior of liquid mixtures is crucial for various optical applications.
• Femtosecond laser pulses offer precise energy deposition for studying transient thermal effects.
• Binary liquid mixtures exhibit complex interactions influenced by their constituent components.

Purpose of the Study:

• To investigate the photo-thermal behavior of binary liquid mixtures using femtosecond laser pulses.
• To correlate changes in transmittance with thermal effects and molecular properties.
• To explore the impact of constituent liquid properties on intermolecular interactions.

Main Methods:

• Utilized the high repetition rate (HRR) Z-scan technique with femtosecond laser pulses.
• Employed closed aperture Z-scan experiments to measure changes in transmittance (ΔT_P-V).
• Analyzed spectroscopic parameters derived from the Z-scan measurements.

Main Results:

• Observed significant thermal effects induced by HRR femtosecond laser pulses in binary liquid mixtures.
• Demonstrated that changes in peak-valley transmittance difference (ΔT_P-V) are indicative of these thermal effects.
• Showed that spectroscopic parameters correlate with the combined physical and molecular properties of the constituent liquids.

Conclusions:

• The HRR Z-scan technique effectively probes photo-thermal behavior and induced thermal effects in binary liquid mixtures.
• Photo-thermal effects significantly influence molecular properties and intermolecular interactions within these mixtures.
• The study establishes a relationship between the spectroscopic parameters and the composition of binary liquid mixtures.