Related Experiment Video
Updated: Aug 18, 2025

Direct Imaging of Laser-driven Ultrafast Molecular Rotation
Published on: February 4, 2017
Controlling Rotationally Resolved Two-Dimensional Infrared Spectra with Polarization
Grzegorz Kowzan1,2, Thomas K Allison1,3
1Department of Chemistry, Stony Brook University, Stony Brook, New York11790-3400, United States.
Abstract:
Recent advancements in infrared frequency combs will enable facile recording of coherent two-dimensional infrared spectra of gas-phase molecules with rotational resolution (RR2DIR). Using time-dependent density-matrix perturbation theory and angular momentum algebra techniques, we derive new polarization conditions unique to freely rotating molecules and absent in the condensed phase. These polarization conditions can be used to suppress parts of 2DIR rovibrational response, clarifying complicated RR2DIR spectra. With the polarization control methods described here, RR2DIR spectroscopy can be a powerful tool for studying complex gas mixtures of polyatomic molecules.
Related Concept Videos
IR Spectroscopy: Molecular Vibration Overview
Stretching vibrations are vibrational motions that occur along the bond line, changing the bond length or distance between two bonded atoms. They are further distinguished as symmetric or asymmetric. In symmetric stretching, the...
Infrared (IR) Spectroscopy: Overview
Different compounds display unique properties due to their...
IR Spectrum Peak Splitting: Symmetric vs Asymmetric Vibrations
IR Spectrometers
IR Spectrum Peak Intensity: Dipole Moment
Applications of IR Spectroscopy: Overview

