Electron Impact Ionisation of Metastable 2s-state Hydrogen Atoms

Two-dimensional Penning Ionization Electron Spectroscopy of CH3I and CH2I2 by He*(2S) Metastable Atoms

Penning ionization of iodomethane (CH3I) and diiodomethane (CH2I2) upon collision with metastable He(2S) atoms was studied by collision-energy/electron-energy resolved two-dimensional Penning ionization electron spectroscopy (2D-PIES) over a wide range of collision energies (20 – 350 meV). Collision energy dependence of partial ionization cross sections (CEDPICS) indicates that the interaction ...

Fast metastable hydrogen atoms from H2 molecules: twin atoms

It is a difficult task to obtain “twin atoms”, i.e. pairs of massive particles such that one can perform experiments in the same fashion that is routinely done with “twin photons”. One possible route to obtain such pairs is by dissociating homonuclear diatomic molecules. We address this possibility by investigating the production of metastable H(2s) atoms coming from the dissociation of cold H2...

TIHE METASTABLE 2p3-STATE OF MfERCURY ATOMS

Threshold electron-impact ionization mechanism for hydrogen atoms.

The near-threshold evolution of electron-impact ionization of hydrogen is revealed with measurements of the angular and energy correlations of the outgoing electrons down to 0.05 eV. The single-, double-, and triple-differential cross sections in the perpendicular plane are measured simultaneously using a dual wedge-and-strip detector on a single-toroidal energy analyzer, avoiding many experime...

Radiative Corrections to the 2E1 Decay Rate of the 2s-State in Hydrogen-Like Atoms

Radiative corrections to the 2E1 decay width of the 2s1/2-state in the low-Z hydrogen-like system are examined within logarithmic approximation. The correction is found to be 2.025(1)α(Zα)/π log(Zα) in units of the non-relativistic rate.