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Principles and Applications of Broadband Impulsive Vibrational Spectroscopy
M Liebel1, C Schnedermann1, T Wende1
1Physical and Theoretical Chemistry Laboratory, University of Oxford , South Parks Road, OX1 3QZ Oxford, U.K.
The Journal of Physical Chemistry. A
|August 12, 2015
Summary
We developed a simpler method using broadband impulsive vibrational spectroscopy to record Raman spectra and vibrational coherences in molecules. This technique analyzes ground and excited electronic states, offering insights into molecular dynamics.
Area of Science:
- Molecular spectroscopy
- Physical chemistry
- Quantum dynamics
Background:
- Vibrational coherences provide crucial information about molecular structure and dynamics.
- Existing frequency-domain techniques for measuring vibrational coherences can be experimentally complex.
Purpose of the Study:
- To present a simplified experimental setup for recording vibrational coherences and Raman spectra.
- To analyze molecules in both ground and excited electronic states.
- To cover a broad spectral range (50-3000 cm(-1)).
Main Methods:
- Utilizing broadband impulsive vibrational spectroscopy.
- Employing a <10 fs excitation pulse combined with an uncompressed white light continuum probe.
- Reducing experimental complexity compared to frequency-domain methods.
Main Results:
- Successfully recorded vibrational coherences and Raman spectra over the 50-3000 cm(-1) range.
- Demonstrated a significant reduction in experimental complexity.
- Provided a clear comparison with existing spectroscopic techniques.
Conclusions:
- The presented setup offers a more accessible approach to studying molecular vibrations.
- The technique is applicable to complex biological molecules like rhodopsin and β-carotene.
- Enables detailed analysis of vibrational coherence evolution in different electronic states.
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