Abstract
We experimentally investigate the vibrational dynamics of nitromethane (NM), nitrobenzene (NB) and their mixtures using femtosecond time-resolved coherence anti-Stokes Raman scattering (CARS) spectroscopy. At first, we coherently excite Raman active modes of NM, NB and the beats arising from vibrational coupling can be clearly identified in CARS spectra. Results indicate that pairs of vibrational modes involved in the coupling correspond to different groups in one molecule. In a second stage, CARS spectroscopy is performed when vibrational modes of mixtures are collectively excited. NM/acetone and NM/methanol mixtures beats are not observed because the hydrogen bonds lead to a faster decoherence. On the other hand, evidences of beats and vibrational dephasing are found in NB/acetone and NB/methanol mixtures despite the fact that interactions in the mixture involve strong hydrogen bonds. The main reason behind this behavior is that phenyl group has a crucial influence on vibrational dynamics in mixtures. In particular, our results confirm that phenyl group bending mode at 425 cm−1 of NB is coupled with the other modes, and suggest may be instrumental in the energy transfer among molecules.
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This manuscript has no associated data or the data will not be deposited. [Authors' comment: There is no external data associated with the manuscript.].
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Acknowledgements
This work was financially supported by Natural Science Foundation of Jiangsu Province (BK20210076), Key Natural Science Foundation of the Jiangsu Higher Education Institutions of China (Grant NO. 20KJA430005), Xuzhou Science and Technology Planning Project (KC20194).
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XL and SQ: formulation or evolution of overarching research goals and aims, creation of models, programming, performing the experiments. QZ: writing- reviewing and editing. WL: performing a part of the experiments, or data/evidence collection provide experimental service. ZS and YP: acquisition of the financial support for the project leading to this publication. WZ: performing a part of the experiments, or data/evidence collection. FH: acquisition of the financial support for the project leading to this publication, creation of models, programming.
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Liu, X., Qiao, S., Zou, Q. et al. Visualizing the effect of phenyl group on the intra-or intermolecular vibrational dynamics of nitromethane, nitrobenzene and their mixtures by coherent anti-Stokes Raman scattering. Eur. Phys. J. D 76, 22 (2022). https://doi.org/10.1140/epjd/s10053-022-00343-4
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DOI: https://doi.org/10.1140/epjd/s10053-022-00343-4