How to add element selectiv x-ray spectroscopy to a femtosecond laboratory and study the spin flip in cobalt

Dharmalingam Kurunthu^a, Jens Uhlig^a, Sophie Canton^a, Wilfred K. Fullagar^a, Kasper Skov Kjaer^a, Villy Sundström^a, William B. Doriese^b, Joe W. Fowler^b, Galen O’Neil^b, Joel N. Ullom^b, Ujjwal Mandal^b, Dan Swetz^b, Luis Miaja-Avila^b, Kevin Silverman^b

^aLund University, Sweden, Kämnärsvägen 10H, Lund, 22645, Sweden

^bQuantum devices group, National Institute of Standards and Technology, 325 Broadway, Boulder, Colorado 80305

International Conference on Hybrid and Organic Photovoltaics
Proceedings of 6th International Conference on Hybrid and Organic Photovoltaics (HOPV14)

Ecublens, Switzerland, 2014 May 11th - 14th

Organizers: Michael Graetzel and Mohammad Nazeeruddin

Poster, Jens Uhlig, 164
Publication date: 1st March 2014

In many laboratories commercially available kHz laser systems in the few mJ class are the basis for studies on photo active materials. While features in optical spectra can often be assigned to specific parts of a molecule by comparison to theoretical models, this assignment can become very difficult in larger complexes. Adding the element selectivity of x-ray absorption and emission spectra to the analysis can help solving this problem.

We developed a tool for time resolved x-ray absorption and emission spectroscopy by generating a sub-picosecond hard x-ray continuum spectrum from a waterjet plasma using such a laser system. The water-jet plasma target combines a flexible sample environment, easy debris handling, and a smooth spectrum free of emission lines with sufficient flux. The novel approach is the use of a single photon measuring cryogenic microcalorimeter array as a high-resolution (3 eV @ 6 keV) energy-dispersive detector. With count rates of up to 16 kHz, more widely spread time resolved x-ray spectroscopy based on table top laser systems becomes feasible. A series of x-ray emission spectra done on cobalt complexes with different ligand strength shows the sensitivity of this technique to electron spin flips and we will discuss how this can be used to study the electron transfer in materials like Ru-Co complexes.

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