Open AccessSingle beam low frequency 2D Raman spectroscopy
Author(s) -
Ilan Hurwitz,
Dekel Raanan,
Lei Ren,
Hadas Frostig,
Patric Oulevey,
Barry D. Bruner,
Nirit Dudovich,
Yaron Silberberg
Publication year - 2020
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.384918
Subject(s) - raman spectroscopy , coherent anti stokes raman spectroscopy , optics , low frequency , spectroscopy , polarization (electrochemistry) , raman scattering , materials science , spectral line , coherent spectroscopy , molecular vibration , vibration , molecular physics , physics , chemistry , acoustics , quantum mechanics , astronomy
Low frequency Raman spectroscopy resolves the slow vibrations resulting from collective motions of molecular structures. This frequency region is extremely challenging to access via other multidimensional methods such as 2D-IR. In this paper, we describe a new scheme which measures 2D Raman spectra in the low frequency regime. We separate the pulse into a spectrally shaped pump and a transform-limited probe, which can be distinguished by their polarization states. Low frequency 2D Raman spectra in liquid tetrabromoethane are presented, revealing coupling dynamics at frequencies as low as 115 cm -1 . The experimental results are supported by numerical simulations which replicate the key features of the measurement. This method opens the door for the deeper exploration of vibrational energy surfaces in complex molecular structures.