Seminarium Optyczne

2DIR spectroscopy is a powerful and well-developed experimental technique, commonly used to study ultrafast molecular dynamics in optically thick liquid-phase and solid-state samples [1].Advances in generation of high-power optical frequency combs in the mid infrared and in cavity enhancement of ultrafast nonlinear signals provide a way to extend 2DIR measurements to weakly absorbing samples, in particular to low-concentration gas-phase samples [2].The high sensitivity of these techniques can be combined with the high resolution of multicomb spectroscopy or Fourier-transform spectroscopy to enable measurements of the shapes of individual resonances.In this talk, I will explain the principles of (cavity-enhanced) two-dimensional infrared spectroscopy with frequency combs and discuss our plan for experimental realization of this technique, including our plans to study optical coherence transport in room-temperature gas-phase molecules [3] and intra-/intermolecular vibrational dynamics in cold molecules.[1] P. Hamm and M. Zanni, Concepts and Methods of 2D Infrared Spectroscopy, 1st ed. (Cambridge University Press, Cambridge, 2011).[2] M. C. Silfies, A. Mehmood, G. Kowzan, E. G. Hohenstein, B. G. Levine, and T. K. Allison, J. Chem. Phys 159, 104304 (2023).[3] G. Kowzan, H. Cybulski, P. Wcisło, M. Słowiński, A. Viel, P. Masłowski, and F. Thibault, Phys. Rev. A 102, 012821 (2020)."