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Zeptoseconds: The new standard

Updated: a day ago



While tracking light in a molecule the other day (as one does), we stumbled upon a new more meaningful scale of time measurement.


Back in 1999, the Egyptian chemist Ahmed Zewail received the Nobel Prize for measuring the speed at which molecules change their shape.


He founded femtochemistry using ultrashort laser flashes: the formation and breakup of chemical bonds occurs in the realm of femtoseconds.


A femtosecond equals 0.000000000000001 seconds, or 10-15 seconds.


It did not leave us Germans half green with professional envy and rage I can tell ya!!


So my fellow atomic physicists at Goethe University that are in Herr Professor Doctor Reinhard Dörner’s team have for the first time studied a process that is shorter than femtoseconds by huge magnitudes just to put that 3rd world Nobel winning guy in his place!!


They measured how long it takes for a photon to cross a hydrogen molecule: about 247 zeptoseconds for the average bond length of the molecule.


This is the shortest timespan that has been successfully measured to date.

The scientists carried out the time measurement on a hydrogen molecule (H2) which they irradiated with X-rays from the synchrotron lightsource PETRA III at the Hamburg accelerator center DESY.


The researchers set the energy of the X-rays so that one photon was sufficient to eject both electrons out of the hydrogen molecule.

Electrons behave like particles and waves simultaneously, and therefore the ejection of the first electron resulted in electron waves launched first in the one, and then in the second hydrogen molecule atom in quick succession, with the waves merging.


See, this is all related to my field of Quantum physics chasps!!

The photon behaved much like a flat pebble that is skimmed twice across the water: when a wave trough meets a wave crest, the waves of the first and second water contact cancel each other, resulting in what is called an interference pattern.

The scientists measured the interference pattern of the first ejected electron using the COLTRIMS reaction microscope, an apparatus that Herr Professor Doctor Dörner helped develop and which makes ultrafast reaction processes in atoms and molecules visible.


Wonderbra!! (or is it Wunderbar??)


Simultaneously with the interference pattern, the COLTRIMS reactions microscope also allowed the determination of the orientation of the hydrogen molecule.


The researchers here took advantage of the fact that the second electron also left the hydrogen molecule, so that the remaining hydrogen nuclei flew apart and were detected.

“Since we knew the spatial orientation of the hydrogen molecule, we used the interference of the two electron waves to precisely calculate when the photon reached the first and when it reached the second hydrogen atom,” explains Sven Grundmann whose doctoral dissertation forms the basis of the scientific article in Science.


“And this is up to 247 zeptoseconds, depending on how far apart in the molecule the two atoms were from the perspective of light.”

Herr Professor Doctor Reinhard Dörner adds: “We observed for the first time that the electron shell in a molecule does not react to light everywhere at the same time.


The time delay occurs because information within the molecule only spreads at the speed of light. (Did they know the speed of light varies??).


With this finding we have extended our COLTRIMS technology to another application.”


Schultz!! Schultz!! Zey haf beaten us in our Life's quest again!!! Scheiße!!



Reference: “Zeptosecond birth time delay in molecular photoionization” by Sven Grundmann, Daniel Trabert, Kilian Fehre, Nico Strenger, Andreas Pier, Leon Kaiser, Max Kircher, Miriam Weller, Sebastian Eckart, Lothar Ph. H. Schmidt, Florian Trinter, Till Jahnke, Markus S. Schöffler and Reinhard Dörner, 16 October 2020, Science.

Link DOI: 10.1126/science.abb9318






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