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Orientational time correlation functions for vibrational sum-frequency generation. 1. Acetonitrile.

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Orientational time correlation functions (TCFs) reveal how molecular reorientation impacts vibrational sum-frequency generation (VSFG) spectroscopy. This reorientation can counteract dephasing, influencing VSFG signals at interfaces.

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Area of Science:

  • Physical Chemistry
  • Spectroscopy
  • Computational Chemistry

Background:

  • Vibrational sum-frequency generation (VSFG) spectroscopy probes interfacial molecular structure and dynamics.
  • Understanding molecular reorientation is crucial for interpreting VSFG signals, especially for high-symmetry oscillators.

Purpose of the Study:

  • To derive and calculate orientational time correlation functions (TCFs) for VSFG spectroscopy.
  • To investigate the influence of molecular reorientation on VSFG response functions at liquid interfaces.

Main Methods:

  • Development of theoretical framework for orientational TCFs in VSFG.
  • Utilized molecular dynamics (MD) simulations to compute TCFs and response functions for acetonitrile.
  • Examined VSFG response at liquid/vapor and liquid/silica interfaces.

Main Results:

  • The impact of reorientation on VSFG signals is highly dependent on the specific functional group and polarization conditions.
  • Calculated TCFs show significant contributions from molecular reorientation.
  • Observed that reorientation can lead to a time-growth of the VSFG response function, counteracting dephasing.

Conclusions:

  • Molecular reorientation plays a significant role in shaping VSFG spectra at interfaces.
  • The findings provide a deeper understanding of interfacial dynamics probed by VSFG spectroscopy.
  • This work offers insights into the interplay between reorientation and dephasing mechanisms in VSFG.