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An international team of researchers has now demonstrated that it is possible to probe electron dynamics in liquids using intense laser fields and to retrieve the electron's mean free path -- the average distance an electron can travel before colliding with another particle.

"We were able to retrieve this quantity -- known as the effective electron mean free path -- from the experimental data thanks to a specifically developed analytical model which accounts for the scattering of the electrons."

"Measuring the effective mean free path of the electrons is very challenging in the low kinetic energy region, as was done in this study, added Yin. "

In “Mean Free Path,” a collection of poetry published in 2010, Ben Lerner kicked off a stanza like this: “There must be an easier way to do this/I mean without writing.”

It is capable of exciting phosphorescence at comparatively low degrees of exhaustion, and also projects shadows at pressures far greater than those at which the mean free path is comparable to the dimensions of the vessel.