2024
DOI: 10.1021/acs.jpcc.3c07096
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Infrared Free Induction Decay (IR-FID) of Non-Interfacial Origin Observed in the Interfacial Sum-Frequency Generation Vibrational Spectroscopy (SFG-VS)

Bo-Jun Zhao,
Xing-Xing Peng,
Li Zhang
et al.

Abstract: We report the observation of infrared free induction decay (IR-FID) signal of the antisymmetric modes around 2350 cm −1 of the gaseous CO 2 molecules in air in the sum-frequency generation vibrational spectroscopy (SFG-VS) measurement from the gold surface. These signals appeared with a time-dependent interference pattern in the 15−73 ps range and beyond after the time zero of the SFG-VS process. The interference pattern was found to reflect the rotational coherence of the gaseous CO 2 molecules. Similar IR-FI… Show more

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