Abstract
We present experimental results on the characteristic sharing of available excess energy, ranging from 11–221 eV, between two electrons in single-photon direct double ionization of He. An effective parametrization of the sharing distributions is presented along with an empirical model that describes the complete shape of the distribution based on a single experimentally determinable parameter. The measured total energy sharing distributions are separated into two distributions representing the shake-off and knock-out parts by simulating the sharing distribution curves expected from a pure wave collapse after a sudden removal of the primary electron. In this way, empirical knock-out distributions are extracted and both the shake-off and knock-out distributions are parametrized. These results suggest a simple method that can be applied to other atomic and molecular systems to experimentally study important aspects of the direct double ionization process.
Highlights
We present experimental results on the characteristic sharing of available excess energy, ranging from 11–221 eV, between two electrons in single-photon direct double ionization of He
If the photon energy is higher than the double ionization potential, there will be a probability for the secondary electron to be ‘shaken off ’ by a wave collapse into states with both electrons in the continuum
SO from the ground state in He would be characterized by the primary electron going out as a p-wave, as it takes the angular momentum of the absorbed photon, and the secondary electron as an s-wave
Summary
We present experimental results on the characteristic sharing of available excess energy, ranging from 11–221 eV, between two electrons in single-photon direct double ionization of He. The primary electron, i.e. the one that interacts with the photon, transfers some of its energy to the secondary electron by a collision-like process. Such a process can lead to double ionization when the energy is shared in such way that both electrons receive a sufficient amount of additional kinetic energy that they can leave the system. This collision-like mechanism is called the knock-out (KO) mechanism.
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