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An Experimental Protocol for Femtosecond NIR/UV - XUV Pump-Probe Experiments with Free-Electron Lasers

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Published on: October 23, 2018

X-rays only when you want them: optimized pump-probe experiments using pseudo-single-bunch operation.

M P Hertlein¹, A Scholl¹, A A Cordones¹

¹Lawrence Berkeley National Laboratory, 1 Cyclotron Road, Berkeley, CA 94720, USA.

Journal of Synchrotron Radiation

|May 2, 2015

Summary

This summary is machine-generated.

Researchers report the first use of pseudo-single-bunch mode for picosecond X-ray absorption experiments. This advanced technique improves signal-to-noise and reduces sample damage in time-resolved studies.

Keywords:

X-ray pulse picking X-ray streak camera bunch kicking laser/X-ray measurements pseudo single bunch pump–probe spectroscopy sample damage time-resolved X-ray spectroscopy

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Published on: August 6, 2018

Area of Science:

Physical Chemistry
Materials Science
Spectroscopy

Background:

Laser pump-X-ray probe experiments necessitate precise control over X-ray pulse patterns and timing.
Optimizing experimental parameters is crucial for enhancing data quality and minimizing sample degradation.

Purpose of the Study:

To report the initial application of pseudo-single-bunch mode at the Advanced Light Source for time-resolved X-ray absorption spectroscopy.
To demonstrate the benefits of adjustable X-ray repetition rates in picosecond pump-probe experiments.

Main Methods:

Utilized pseudo-single-bunch mode at the Advanced Light Source, enabling adjustable X-ray repetition rates from single-shot to 500 kHz.
Conducted time-resolved X-ray absorption experiments on solutions and solids.
Demonstrated single-shot X-ray exposures using a streak camera and a conventional charge-coupled device (CCD) camera.

Main Results:

Successfully matched X-ray pulse rates to laser excitation pulse rates, improving experimental synchronization.
Significantly reduced detector noise and enhanced signal-to-noise ratios in time-resolved measurements.
Considerably decreased dose-induced sample damage, facilitating the study of sensitive materials.

Conclusions:

Pseudo-single-bunch mode offers a significant advancement for picosecond time-resolved X-ray absorption experiments.
The technique improves data quality, reduces experimental artifacts, and expands the scope of accessible samples.
This method provides greater flexibility and efficiency in pump-probe spectroscopy studies.