Journal
JOURNAL OF CHEMICAL PHYSICS
Volume 154, Issue 12, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/5.0046664
Keywords
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Funding
- Deutsche Forschungsgemeinschaft [WO 558/14-1]
- European Research Council (ERC) under the European Union [833365]
- European Research Council (ERC) [833365] Funding Source: European Research Council (ERC)
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This article discusses the current status of 2D-THz spectroscopy, covering key concepts and recent results related to interactions with matter. It includes the response of vibrational excitations in molecular crystals, nonperturbative light-matter interaction, field-driven ionization processes, and electron transport in liquid water.
Nonlinear terahertz (THz) spectroscopy relies on the interaction of matter with few-cycle THz pulses of electric field amplitudes up to megavolts/centimeter (MV/cm). In condensed-phase molecular systems, both resonant interactions with elementary excitations at low frequencies such as intra- and intermolecular vibrations and nonresonant field-driven processes are relevant. Two-dimensional THz (2D-THz) spectroscopy is a key method for following nonequilibrium processes and dynamics of excitations to decipher the underlying interactions and molecular couplings. This article addresses the state of the art in 2D-THz spectroscopy by discussing the main concepts and illustrating them with recent results. The latter include the response of vibrational excitations in molecular crystals up to the nonperturbative regime of light-matter interaction and field-driven ionization processes and electron transport in liquid water.
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