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Related Concept Videos

Fluorescence and Phosphorescence: Instrumentation01:25

Fluorescence and Phosphorescence: Instrumentation

Fluorometers and spectrofluorometers are two types of instruments used for measuring molecular fluorescence. These instruments differ in how they select excitation and emission wavelengths and the type of light sources they utilize. Fluorometers use absorption interference filters to choose excitation and emission wavelengths. The excitation source in a fluorometer is typically a low-pressure mercury vapor lamp that emits intense lines distributed throughout the ultraviolet and visible regions.
Inductively Coupled Plasma Atomic Emission Spectroscopy: Instrumentation01:26

Inductively Coupled Plasma Atomic Emission Spectroscopy: Instrumentation

Inductively coupled plasma (ICP) is the common plasma source used in atomic emission spectroscopy (AES), a technique that detects and analyzes various elements in a sample. This method is often called inductively coupled plasma atomic emission spectroscopy (ICP-AES).
There are three main types of inductively coupled plasma atomic emission spectroscopy  (ICP-AES) instruments: sequential, simultaneous multichannel, and Fourier transform instruments, with the latter being less commonly used.

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XFEL Beamline Optical Instrumentation for Ultrafast Science.

Christopher D M Hutchison1, Samuel Perrett1, Jasper J van Thor1

  • 1Department of Life Sciences, Faculty of Natural Sciences, Imperial College London, London SW7 2AZ, United Kingdom.

The Journal of Physical Chemistry. B
|August 1, 2024
PubMed
Summary
This summary is machine-generated.

Free electron lasers enable ultrafast science. Optical control via nonlinear spectroscopy enhances X-ray experiments, offering new possibilities for studying structural dynamics with advanced laser pulse shaping.

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Area of Science:

  • Ultrafast science
  • X-ray science
  • Chemical physics

Background:

  • Free electron lasers (FELs) offer powerful X-ray sources for time-resolved studies.
  • Ultrafast experiments (picosecond to attosecond) often require synchronized optical laser excitation.
  • Current capabilities limit the full potential of FELs for controlling structural dynamics.

Purpose of the Study:

  • To explore optical control of structural dynamics using nonlinear spectroscopy with ultrafast X-ray experiments.
  • To highlight the need for advanced optical pulse synthesis and characterization.
  • To outline recommended laser and pulse shaping equipment for time-resolved FEL beamlines.

Main Methods:

  • Application of nonlinear spectroscopy techniques to ultrafast X-ray experiments.
  • Synthesis and characterization of multiple optical pulses with controlled parameters.
  • Coherent control experiments using femtosecond laser excitation (e.g., Tannor-Rice experiment).

Main Results:

  • Demonstrated feasibility of optical control in ultrafast X-ray experiments.
  • Highlighted the importance of precisely controlled multi-color and multi-pulse laser excitation.
  • Showcased successful coherent control experiments on protein crystals.

Conclusions:

  • Advanced optical techniques, including pulse shaping, are crucial for unlocking new capabilities in ultrafast X-ray science.
  • Implementing sophisticated laser systems and characterization methods at FEL facilities will enable novel studies of structural dynamics.
  • This approach is particularly relevant for time-resolved serial femtosecond crystallography.