Group members

Diversity Statement:
Science is for everyone, irrespective of gender, gender identity, sexual orientation, race, color, creed, or nationality. Science saves lives today, and gives our strongest hope for a peaceful and healthy future for all people. The Seidler group provides a welcoming and supportive work environment for all members.

Looking for students:
We are currently looking for additional graduate and undergraduate students to work on a variety of projects in our lab. If you're interested, email Jerry ( for more information.

Gerald Seidler
Jerry has been a faculty member in the Physics department at the University of Washington since 1996. The Seidler group had two main research thrusts. First, we investigate the physics of environmentally- and industrially-relevant materials, with a strong emphasis on advanced x-ray techniques. This includes developing and applying new instruments and techniques for advanced x-ray spectroscopy in the laboratory setting and a wide range of major facilities. Second, again using x-ray methods, we create and study high-energy density plasma systems, such as by illumination with x-ray free electron lasers. These experiments allow us to access experimental systems having electronic temperatures of millions of Kelvin but ion cores that still rest on a periodic lattice. Such systems are a rich testing ground for theoretical treatments of partially ionized plasmas, such is important for several astrophysical problems and also the early stages of inertial confinement fusions.

Alex Ditter
Alex joined the Seidler lab in June 2014. He principally worked on the commissioning of CEI-XANES. Alex is currently working with collaborators at Los Alamos National Lab, extending the application of laboratory x-ray instrumentation to Actinide and Lanthanide chemistry.

Evan Jahrman
Evan Jahrman joined the Seidler lab in June of 2015. Since then, he contributed improvements to the hard x-ray spectrometer prototype as well as the design and construction of the lab’s current version. Evan has made use of the lab’s in house capabilities in various basic and applied studies, including: multi-electron excitation dynamics near the Fermi-edge, chromium speciation in samples of environmental interest, and valence-to-core XES measurements of lanthanides. As a Clean Energy Institute Fellow, he studied novel energy storage materials and worked on the design of a low-absorption pouch cell for in situ battery studies.

Contact Evan for information regarding the hard x-ray spectrometer.

William Holden
William Holden started in the Seidler group Autumn 2015, where he immediately began work on extending the laboratory spectroscopy techniques to x-rays of lower energy. His work culminated in the world’s first laboratory-based, high-resolution spectrometer capable of measuring sulfur and phosphorus x-ray emission spectra at count rates and resolution comparable to synchrotron performance. He is currently continuing development and improvement of the low-energy spectrometer, and utilizing it to complete novel studies of sulfur- and phosphorous-containing samples, such as a recent study of InP quantum dots.

Contact William for information regarding the tender x-ray spectrometer.

John Ferré
John Ferré joined the Seidler group in July of 2018. He began by studying conventional ideas on optimizing the data collection of lab-based and synchrotron-based spectroscopy when there are dilute samples or a small number of incident counts. He later plans on focusing on the warm dense matter (WDM) regime using x-ray free electron laser (XFEL) techniques.

Recent Alumni

Oliver Hoidn
Oliver joined the Seidler lab in 2012. Oliver’s primary research focus is the interrogation of warm dense matter (WDM) by x-ray techniques at laser, synchrotron, and x-ray free electron laser (XFEL) facilities.

Ryan Valenza
Ryan joined the Seidler lab in June of 2014. His primary research focus was the interrogation of crystalline warm dense matter (WDM) using x-ray diffraction at synchrotrons and x-ray free electron (XFEL) facilities, as well as theoretical modeling of such systems using finite-T methods in Density Functional Theory (DFT).