Related Experiment Video
Updated: Aug 11, 2026
10:52
Direct Imaging of Laser-driven Ultrafast Molecular Rotation
Published on: February 4, 2017
Tunable ultrafast infrared/visible laser to probe vibrational dynamics
Tissa C Gunaratne1, Matthew Milliken, J Reddy Challa
1Center for Chemical Dynamics, Department of Chemistry, Case Western Reserve University, Cleveland, Ohio 44106, USA.
Applied Optics
|February 9, 2006
Summary
This study introduces a tunable, ultrafast laser system for probing condensed-phase vibrational dynamics. The system effectively illuminates fast molecular structure and energy changes using Raman spectroscopy.
Area of Science:
- Physical Chemistry
- Spectroscopy
- Laser Physics
Background:
- Understanding ultrafast vibrational dynamics is crucial for molecular processes.
- Direct, time-resolved probing of condensed-phase systems presents significant challenges.
Purpose of the Study:
- To describe and characterize a novel tunable, ultrafast laser system.
- To demonstrate its application in exploring condensed-phase vibrational dynamics.
Main Methods:
- Generation of tunable mid-IR and UV/visible radiation (100 fs–1 ps).
- Utilization of Raman spectroscopy for probing.
- Spectral narrowing of probe pulses for vibrational resolution.
- Frequency-resolved optical gating for beam characterization.
Main Results:
- Characterization of a versatile ultrafast laser system.
- Demonstration of effective temporal overlap determination for pump-probe experiments.
- Successful application in studying heme and paranitroaniline vibrational dynamics.
Conclusions:
- The developed laser system is effective for time-resolved studies of molecular dynamics.
- It provides insights into fast structural and energy dynamics in condensed phases.
- The system's visible pump-visible probe capability is particularly powerful.
Related Concept Videos
01:24IR Spectroscopy: Molecular Vibration Overview
When Infrared (IR) radiation passes through a covalently bonded molecule, the bonds transition from lower to higher vibrational levels. The fundamental vibrational motions that result in infrared absorption can be classified as stretching or bending vibrations.
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...
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...
01:16UV–Vis Spectroscopy: Molecular Electronic Transitions
In Ultraviolet–Visible (UV–Vis) spectroscopy, the absorption of electromagnetic radiation is used to probe the electronic structure of molecules. This technique provides insights into molecular electronic transitions, particularly the movement of electrons between different molecular orbitals. Radiation is absorbed if the energy of the electromagnetic radiation passing through the molecule is precisely equal to the energy difference between the excited and ground states. During this process,...
01:16IR Spectroscopy: Hooke's Law Approximation of Molecular Vibration
A covalently bonded heteronuclear diatomic molecule can be modeled as two vibrating masses connected by a spring. The vibrational frequency of the bond can be expressed using an equation derived from Hooke's law, which describes how the force applied to stretch or compress a spring is proportional to the displacement of the spring. In this case, the atoms behave like masses, and the bond acts like a spring.
According to Hooke's law, the vibrational frequency is directly proportional to the...
According to Hooke's law, the vibrational frequency is directly proportional to the...
01:02Ultraviolet and Visible (UV–Vis) Spectroscopy: Overview
Ultraviolet–visible (UV–visible or UV–Vis) spectroscopy is an analytical technique that investigates the interaction between matter and UV–Vis light within the electromagnetic spectrum. This method is widely used for its versatility, simplicity, and relatively quick data acquisition, making it valuable for both qualitative and quantitative analysis. When UV–Vis radiation passes through a material, molecules absorb light depending on the energy required for electronic transitions. As a result...
01:26Raman Spectroscopy Instrumentation: Overview
A conventional Raman spectrophotometer includes a laser source, a sample holding system, a wavelength selector, and a detector.
The monochromatic laser source, typically using visible or near-infrared radiation, generates a highly focused beam of light. This light interacts with the molecules of the sample, scattering some of the light. Liquid and gaseous samples are usually tested in ordinary glass capillaries, while solids can be analyzed as powders packed in capillaries or as potassium...
The monochromatic laser source, typically using visible or near-infrared radiation, generates a highly focused beam of light. This light interacts with the molecules of the sample, scattering some of the light. Liquid and gaseous samples are usually tested in ordinary glass capillaries, while solids can be analyzed as powders packed in capillaries or as potassium...
01:09Infrared (IR) Spectroscopy: Overview
When electromagnetic radiation passes through a material, atoms or molecules transition from a lower to a higher energy state by absorbing radiation corresponding to the energy difference between the two states. The absorption of infrared (IR) radiation causes transitions between vibrational energy levels in a molecule. Therefore, IR spectroscopy is a useful analytical tool for determining the molecular structure of molecules.
Different compounds display unique properties due to their...
Different compounds display unique properties due to their...