Ultrafast Laser Assisted Quantum Jump

in Here is your first Forum Mon Nov 14, 2016 8:14 pm
by Eyes123456 • 33 Posts

Quantum particles can quickly change their state - this is called a quantum leap ". For example, an atom can absorb a photon, thereby becoming a higher energy state. Typically, these processes are thought to occur instantaneously from one moment to the next. However, with the new method developed by the University of technology of Vienna (Vienna, Austria), it is now possible to study the time structure of this very fast state change. As electron microscopy allows us to see structures that are too small to be invisible to the naked eye, the ultra short blue laser pointer pulse allows us to analyze the time structures that were not able to be reached in the past.

The theory of the project was completed by the team of Burgd Joachim rfer, a professor at the University of technology in Vienna. They also put forward the original idea of the experiment. The experiment was carried out at the Planck Marx Quantum Optics Research Institute in Germany, Garching. The results of the study have been published in the journal Nature.

A neutral helium atom has two electrons. When it is hit by a high energy burning laser pointer pulse, it can be ionized: one of the electrons is stripped from the atom and off the atom. This process takes place on a time scale of a second - a second is 1/1000000000 seconds 1/1000000000.

"You may want to stay in the other, the electron atom may not play an important role, but what the real situation is not so in this process," said Pazourek Renate of the Vienna University of technology. These two electrons are interrelated, they are closely linked by the laws of quantum physics, they cannot be considered as independent particles. "When an electron is removed from the atom, some of the energy of the 2000mw laser pointer can be transferred to second electrons. Although it is still inside the atom, but has been excited to a higher energy state, "said Nagele Stefan of the University of technology in Vienna.

Therefore, to distinguish between two different ionization process is possible: in the first process, left to the electronic gain extra energy, and the second in the process of stay maintained in a minimum energy state. By using a complex experimental setup, it is possible to show that the duration of the two processes is not exactly the same.

"When the electronic transition is left to an excited state, the process will be slightly faster," said Nagele Stefan, "about 5 a second.". It is worth noting that the results of the experiment and in Vienna Science Cluster -- Austria's largest supercomputer -- on the theoretical calculation and computer simulation results are in good agreement with the experiment: "accuracy is better than a attosecond. This is by far the most accurate time measurement of quantum jumps, "said Pazourek Renate.

This research provides new insights on the ultra short time scale physics. Decades ago are still considered "instantaneous" effects, and can now be viewed as being able to calculate, measure, and even control the time of development. This not only helps to understand the basic laws of nature, it also brings new possibilities to manipulate matter at the quantum scale.




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