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An All-Hands Meeting has been scheduled for Monday, February 11, 2013 at 10:30 a.m. in the 402 Auditorium. Brian Stephenson will present an update on the current status and future plans for APS, including the APS Upgrade. All employees whose schedule permit are urged to attend. Resident users are welcome to attend.
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Ultrafast XUV and X-ray light sources offer new opportunities to unravel fundamental electronic and nuclear dynamics in matter. The Chemical Dynamics program at the Ultrafast X-ray Science Laboratory is focused on the application of emerging laboratory- and accelerator-based X-ray techniques to monitor the flow of charge, mass, and energy in molecules, clusters, and interfacial systems. A brief overview of the program will be followed by the discussion of two particular showcase examples of ongoing research: The study of photoinduced charge-transfer dynamics in dye-sensitized nanocrystals by time-resolved X-ray photoelectron spectroscopy and the investigation of quantized fluid dynamics in nano- to micron-scale superfluid helium droplets by single-shot coherent diffractive imaging.

Interfacial charge transfer studies are performed at the Linac Coherent Light Source (LCLS, SLAC National Accelerator Laboratory) and the Advanced Light Source (ALS, Berkeley). Recent LCLS results demonstrate the potential of time-resolved X-ray photoelectron spectroscopy (TRXPS) to monitor charge migration in complex interfacial systems with femtosecond time resolution, chemical sensitivity and element specificity. The visible light induced transient oxidation state of N3 dye molecules adsorbed to nanocrystalline ZnO is characterized in a concerted effort of TRXPS experiments and ab-initio calculations of the interfacial electronic structure.

The superfluid nature of helium droplets presents a rare opportunity to study the onset of macroscopic quantum phenomena in sub-micron scale systems. Pure and doped helium droplets are studied by coherent diffractive imaging (CDI) using femtosecond X-ray pulses from the LCLS. Single-shot CDI data provide the most direct access yet to droplet size- and shape-distributions as well as fundamental dynamics inside the clusters. The results will be discussed in the context of the onset of quantum vorticity in finite three-dimensional quantum systems.
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On February 27 at 2 p.m., the AES-IS group will hold an ICMS 101 Training session in 401/B4100. The class is intended for new employees and new or current ICMS users who are looking to refresh or enhance their ICMS knowledge.

We will discuss:

• ICMS Overview
• What to Contribute
• Checking In Documents and Revision Control
• Document Security and Metadata
• Searching Content and using Library Folders
• Basic Workflows

All APS personnel are welcome, but due to limited class size, please RSVP if you plan to attend by sending an email to leighton@aps.anl.gov
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