Time resolved transient transmission spectroscopy of TiCl₄ and SnCl₄

Area of Science:

• Physical Chemistry
• Spectroscopy
• Condensed Matter Physics

Background:

• Intermolecular interactions significantly influence the vibrational spectra of liquids.
• Understanding these interactions is crucial for characterizing liquid dynamics and properties.
• Previous spectroscopic methods lacked the resolution to fully probe these subtle effects.

Purpose of the Study:

• To present the first vibrational spectra of liquid TiCl4 and SnCl4 using time-resolved transient transmission spectroscopy.
• To investigate the influence of intermolecular interactions on the isotopically split isotropic ν1 intramolecular vibrational band.
• To determine intermolecular force constants and decoherence lifetimes in these liquids.

Main Methods:

• Time-resolved transient transmission spectroscopy to acquire high-resolution vibrational spectra.
• Fast Fourier Transform (FFT) analysis of time-domain signals.
• Dilution of TiCl4 and SnCl4 in CS2 to study concentration-dependent spectral changes.
• Application of a pump-probe spectroscopic technique with windowed FFT.

Main Results:

• High-resolution vibrational spectra were obtained for liquid TiCl4 and SnCl4.
• The dependence of spectral shape on intermolecular interactions was clearly established.
• Intermolecular force constants and decoherence lifetimes were determined for various concentrations.
• The evolution of spectral shape and intermolecular forces post-perturbation was observed.

Conclusions:

• Time-resolved transient transmission spectroscopy provides unprecedented detail on liquid vibrational spectra.
• Intermolecular interactions in liquid TiCl4 and SnCl4 can be quantitatively characterized.
• The study offers a dynamic view of intermolecular forces in liquids following external perturbation.