FLASH News

13 April 2021

Microscopic origins of electrical conductivity in superheated solids revealed at FLASH


In-depth understanding of the electrical conductivity of matter is the key to many cutting-edge research and applications, ranging from phase-change memory in microelectronics to magnetospheres rooted in planetary interiors due to the motion of the conductive fluid. Unique states of material created by ultrafast table-top lasers or free-electron lasers (FEL) allow us to gain insight ...

24 February 2021

Direct observation of charge separation in an organic light-harvesting system


Molecular heterojunctions receive significant attention due to their key role in a wide variety of emerging organic semiconductor applications, such as organic light-emitting diodes, field-effect transistors, spintronic devices, and photovoltaic cells. Understanding ultrafast dynamics of photon-to-charge conversion is paramount for optimising novel light-harvesting ...

08 February 2021

Measuring chirps at extremely high frequencies at FLASH


A new method provides an ultra-fast plasma switch, which temporally cuts off parts of high-frequency light flashes. Carried trillions of times faster by light waves than by sound waves, these flashes sound like birdsong and cricket songs. This understanding opens up new possibilities for optimising state-of-the-art light sources and controlling elementary motions in ...

29 January 2021

Online user meetings discuss Corona research and future facility developments


Due to the Corona pandemic, the annual users' meetings 2021 for the Hamburg X-ray light sources took place completely online for the first time this year. The users of PETRA III and FLASH met from 25 to 29 January at the DESY Photon Science Users' Meeting and traditionally at the same time as the users of the European X-ray laser European XFEL. The interest was undiminished: In total, more than ...

18 January 2021

Clocking the movement of electrons inside an atom


Hard X-ray free-electron lasers (XFELs) have delivered intense, ultrashort X-ray pulses for over a decade. One of the most promising applications of XFELs is in biology, where researchers can capture images down to the atomic scale even before the radiation damage destroys the sample. In physics and chemistry, these X-rays can also shed light on the fastest processes occurring in nature with a shutter ...