Scientists have built a strong and powerful X-ray laser to heat water from room temperature to 100,000 degrees Celsius in less than a tenth of a picosecond ( millionth of a millionth of a second).
The experimental set-up, that can be seen as the world’s fastest water heater, produced an exotic state of water, from which researchers hope to learn more about the peculiar characteristics of Earth’s most important liquid.
The observations also have a practical use for the probing biological and many other samples with X-ray lasers. Their tiny wavelengths, intensely focused X-rays are a great tool for studying the atomic structures of molecules and other nanoscale objects. To better understand the physics behind this destruction, an international team of researchers hit a tiny jet of water with a flash from an X-ray laser called the Linac Coherent Light Source at the SLAC National Accelerator Laboratory in the US.
“It is certainly not the usual way to boil your water,” said physicist Carl Caleman. “Normally, when you heat water, the molecules will just be shaken stronger and stronger.”
On the molecular level, heat is motion – the hotter, the faster the motion of the molecules. This can be achieved, for example, via heat transfer from a stove, or more directly with microwaves that make the water molecules swing back and forth ever faster in step with the electromagnetic field.
“Our heating is fundamentally different”, explained physicist Carl Caleman. “The energetic X-rays punch electrons out of the water molecules, thereby destroying the balance of electric charges. So, suddenly the atoms feel a strong repulsive force and start to move violently.”
In less than 75 femtoseconds, that’s 75 millionths of a billionth of a second or 0.000 000 000 000 075 seconds, the water goes through a phase transition from liquid to plasma. A plasma is a state of matter where the electrons have been removed from the atoms, leading to a sort of electrically charged gas.
“But while the water transforms from liquid to plasma, it still remains at the density of liquid water, as the atoms didn’t have time to move significantly yet,” said co-author Olof Jönsson from Uppsala University.
This exotic state of matter is nothing that can be found naturally on Earth. “It has similar characteristics as some plasmas in the sun and the gas giant Jupiter but has a lower density. Meanwhile, it is hotter than Earth’s core.”
The scientists used their measurements to validate simulations of the process. Together, the measurements and simulations allow them to study this exotic state of water in order to learn more about water’s general properties. “Water really is an odd liquid, and if it weren’t for its peculiar characteristics, many things on Earth wouldn’t be as they are, particularly life”, says physicist Olof Jönsson
Water displays many anomalies, including its density, heat capacity and thermal conductivity. It is these anomalies that will be investigated within the future Centre for Water Science (CWS) planned at DESY, and the obtained results are of great importance for the activities there.
Apart from its fundamental significance, the study also has immediate practical significance. X-ray lasers are often used to investigate the atomic structure of tiny samples. “It is important for any experiment involving liquids at X-ray lasers,” said co-author Kenneth Beyerlein from CFEL.
“In fact, any sample that you put into the X-ray beam will be destroyed in the way that we observed. If you analyze anything that is not a crystal, you have to consider this.” For crystals, other research has shown that a signal can be recorded before the crystal is destroyed.
The measurements show almost no structural changes in the water up to 25 femtoseconds after the X-ray pulse starts to hit it. But at 75 femtoseconds, changes are already evident.
“The study gives us a better understanding of what we do to different samples,” explained co-author Nicusor Timneanu from Uppsala University, one of the key scientist developing the theoretical model used. “Its observations are also important to consider for the development of techniques to image single molecules or other tiny particles with X-ray lasers.”
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