Photoionization of helium above the n = 2 photoionization threshold

Photoionization of helium above the n = 2 photoionization threshold

2014 Using the technique of electron spectrometry and the synchrotron radiation of the storage ring ACO, the photoionization of helium has been investigated between 69 and 150 eV. The probability to leave the residual ion in the n = 2 excited state has been measured as a function of photon energy. The absolute partial photoionization cross section for this process has been determined and found ...

Double photoionization of Helium

Photoionization dynamics in pure helium droplets.

The photoionization and photoelectron spectroscopy of pure He droplets were investigated at photon energies between 24.6 eV (the ionization energy of He) and 28.0 eV. Time-of-flight mass spectra and photoelectron images were obtained at a series of molecular beam source temperatures and pressures to assess the effect of droplet size on the photoionization dynamics. At source temperatures below ...

Single‐photon threshold photoionization of NO

Articles you may be interested in Single-photon and resonance-enhanced multiphoton threshold ionization of the allyl radical Single-photon threshold photoionization spectra for jet-cooled NO have been measured for the v+ =0 and 1 vibrational levels of the X I~+ ground state of NO+. The NO+ rotational state distribution for the v+ =0 level is shown to be perturbed by nearby autoionizing levels, ...

Triple photoionization of Lithium near threshold

Solving the full classical four-body Coulomb problem numerically using a Wigner initial distribution we formulate a classical-quantum hybrid approach to study triple ionization by single photon absorption from the Li ground state in the threshold region. We confirm the Wannier threshold law σ ∝ Eα and we show that the α determined in the interval between 2−5 eV deviates from the analytical thre...