Related Experiment Video
Updated: Jun 20, 2026
10:03
Proton Transfer and Protein Conformation Dynamics in Photosensitive Proteins by Time-resolved Step-scan Fourier-transform Infrared Spectroscopy
Published on: June 27, 2014
Subpicosecond time-resolved infrared spectral photography.
Optics Letters
|September 10, 2009
Summary
A new apparatus records broadband infrared absorption spectra with subpicosecond time resolution. This breakthrough utilizes stimulated electronic Raman scattering and an infrared-to-visible upconverter for enhanced spectral analysis.
Area of Science:
- Spectroscopy
- Physical Chemistry
- Materials Science
Background:
- Accurate measurement of infrared absorption spectra is crucial for understanding molecular dynamics and chemical reactions.
- Achieving high time resolution in spectroscopic measurements allows for the study of ultrafast phenomena.
Purpose of the Study:
- To describe a novel apparatus for recording broadband infrared absorption spectra.
- To achieve subpicosecond time resolution in the 2.2 to 2.7 micrometer range.
- To present new methods for generating and detecting infrared light with high temporal precision.
Main Methods:
- Development of a subpicosecond infrared continuum generator based on stimulated electronic Raman scattering in Barium (Ba) vapor.
- Utilization of a broadband infrared-to-visible upconverter employing alkali metal vapor.
- Integration of these components into a complete spectroscopic apparatus.
Main Results:
- Successful recording of broadband infrared absorption spectra within the 2.2 to 2.7 micrometer range.
- Demonstration of subpicosecond time resolution in the spectroscopic measurements.
- Validation of the novel continuum generation and upconversion techniques.
Conclusions:
- The described apparatus provides a powerful new tool for investigating ultrafast processes in the infrared spectral region.
- The combination of stimulated electronic Raman scattering and alkali metal vapor upconversion offers significant advantages for high-time-resolution spectroscopy.
- This technology has potential applications in various fields, including chemistry, physics, and materials science.
Related Concept Videos
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...
01:25IR Spectrometers
There are two main infrared (IR) spectrophotometers: dispersive IR spectrometers and Fourier transform infrared (FTIR) spectrometers. In a dispersive IR spectrometer, a beam of infrared radiation produced by a hot wire is divided into two parallel equal-intensity beams using mirrors. One beam passes through the sample, while another is a reference beam. The beams then move through the monochromator, which separates the radiations into a continuous spectrum of different frequencies. The...
01:37Super-resolution Fluorescence Microscopy
Super-resolution fluorescence microscopy (SRFM) provides a better resolution than conventional fluorescence microscopy by reducing the point spread function (PSF). PSF is the light intensity distribution from a point that causes it to appear blurred. Due to PSF, each fluorescing point appears bigger than its actual size, and it is the PSF interference of nearby fluorophores that causes the blurred image. Various approaches to achieving higher resolution through SRFM have recently been developed.
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...
01:11Applications of IR Spectroscopy: Overview
The non-destructive nature and ability to provide valuable chemical information make IR spectroscopy a versatile technique with broad applications in various scientific and industrial fields. IR spectroscopy is commonly used to identify and characterize organic and inorganic compounds. It provides information about the functional groups present in a molecule and the bonding between atoms. This helps in the structural elucidation of compounds during organic synthesis, pharmaceutical research,...
01:13Attenuated Total Reflectance (ATR) Infrared Spectroscopy: Overview
Attenuated total reflectance (ATR) infrared spectroscopy is a powerful analytical technique used to study the composition of materials. It is widely employed in chemistry, materials science, forensic science, and other fields where sample characterization is required. ATR has several advantages over traditional transmission IR spectroscopy, including the requirement of little to no sample preparation and the ability to analyze a wide range of samples.
The ATR process begins by directing a beam...
The ATR process begins by directing a beam...