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A theoretical description of polarization-angle-scanning (PAS) two-dimensional infrared (2DIR) spectroscopy, where the incident beampolarization directions are considered to be novel dimensions in coherent two-dimensional (2D) optical spectroscopy, is presented. To shed light on the underlying principles and to illustrate a potential use of this measurement method, we investigate the PAS 2DIR spectroscopy of an alanine-based antiparallel β-sheet, using the relationships between cross-peak amplitudes and incident beampolarization directions and carrying out numerical simulations. The numerically simulated PAS 2DIR spectra of the antiparallel β-sheet show that the magnitude and sign of the cross peak reflecting the correlation between the two characteristic amide I vibrations change for varying beampolarization directions. This suggests that each individual cross peak in a given 2D spectrum can be selectively eliminated with an appropriate beampolarization configuration, which in turn provides information on the transition dipole angle and possibly on the structure of coupled multichromophoric systems. This novel measurement method combining the polarization-angle-scanning technique with 2D vibrational or electronic spectroscopy would be a useful tool for probing structural changes of nonequilibrium molecular systems and to investigate transfers of population and coherence by monitoring the time-dependent changes of angles between transition dipoles.


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