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

Laser pump–X-ray probe experiments require control over the X-ray pulse pattern and timing. Here, the first use of pseudo-single-bunch mode at the Advanced Light Source in picosecond time-resolved X-ray absorption experiments on solutions and solids is reported. In this mode the X-ray repetition rat...

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Detalles Bibliográficos
Autores principales: Hertlein, M. P., Scholl, A., Cordones, A. A., Lee, J. H., Engelhorn, K., Glover, T. E., Barbrel, B., Sun, C., Steier, C., Portmann, G., Robin, D. S.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: International Union of Crystallography 2015
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4416684/
https://www.ncbi.nlm.nih.gov/pubmed/25931090
http://dx.doi.org/10.1107/S1600577515001770
Descripción
Sumario:Laser pump–X-ray probe experiments require control over the X-ray pulse pattern and timing. Here, the first use of pseudo-single-bunch mode at the Advanced Light Source in picosecond time-resolved X-ray absorption experiments on solutions and solids is reported. In this mode the X-ray repetition rate is fully adjustable from single shot to 500 kHz, allowing it to be matched to typical laser excitation pulse rates. Suppressing undesired X-ray pulses considerably reduces detector noise and improves signal to noise in time-resolved experiments. In addition, dose-induced sample damage is considerably reduced, easing experimental setup and allowing the investigation of less robust samples. Single-shot X-ray exposures of a streak camera detector using a conventional non-gated charge-coupled device (CCD) camera are also demonstrated.