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The side-to-side motion of electrons in a beam can be circular, elliptical, or linear, depending on the position of the Delta undulator's magnet rows. These different motions then create circular, elliptical, or linear polarization in the light pulse.

In photosystem II, the water-splitting center cycles through four stable states

Deep inside rocky planets like Earth, the behavior of iron can greatly affect the properties of molten rock materials: properties that influenced how Earth formed and evolved.

A prototype section of the proposed Cool Cooper Collider beam tunnel.

In photosystem II, the water-splitting center cycles through four stable states, S₀-S₃. On a baseball field, S₀ would be the start of the game when a batter on home base is ready to hit.

SLAC’s newly upgraded Linac Coherent Light Source (LCLS) X-ray free-electron laser (XFEL) successfully produced its first X-rays, creating unparalleled capabilities that will usher in a new era in research.