Atomic Lifetimes and Transition Probabilities in Boron-like (Na VII) and Beryllium-like (Na VIII) Sodium Ions

in European Physical Journal D -- Atoms, Molecules, Clusters & Optical Physics (1999), 6

Atomic Lifetimes of n=2 Levels of Boron-like Na

Conference (1998, August)

Lifetimes and oscillator strengths for ultravilolet transitions in neutral sulfur

in Astrophysical Journal (1998), 502

Spectroscopy of Ne IV in the wavelength Range 450–1100 Å

in Journal of the Optical Society of America. B, Optical Physics (1997), 14

An analysis of the Ne IV spectrum was undertaken in the 450–1100-Å spectral range. The spectra were produced by the beam–foil method with beam energies of 1.2 and 2.5 MeV, respectively. The resolution ... [more ▼]

An analysis of the Ne IV spectrum was undertaken in the 450–1100-Å spectral range. The spectra were produced by the beam–foil method with beam energies of 1.2 and 2.5 MeV, respectively. The resolution that was achieved, with a normal-incidence 2-m spectrometer, was sufficient to identify 53 new Ne IV lines and, consequently, to determine 18 new levels in the quartet and doublet systems and one sextet term. The energy values of 13 additional levels were also revised. The classification work was facilitated by the use of scaled relativistic Hartree–Fock calculations. [less ▲]

The Spectrum of Ne V

in Physica Scripta (1997), 55

A new investigation of the Ne V spectrum is reported. The beam-foil method has been used to produce spectra at two different energies (1.2 MeV and 2.5 MeV) between 450 and 11OOA Sixty-five lines of Ne V ... [more ▼]

A new investigation of the Ne V spectrum is reported. The beam-foil method has been used to produce spectra at two different energies (1.2 MeV and 2.5 MeV) between 450 and 11OOA Sixty-five lines of Ne V have been newly identified. Fifty levels have been determined for the first time and energies have been revised for seven levels. [less ▲]

Dye Laser Wavelength Scanning

Poster (1996)

New Level Determinations in Ne V

Poster (1996)

The Spectrum of Ne V

Poster (1996)

Lifetime Measurement by Beam-Foil Spectroscopy

in Phys. Scr. (1996), T65

The beam-foil source can produce spectra of almost every ion and allows easy measurement of atomic lifetimes of excited levels. Beam-foil spectra have some unique characteristics that made them valuable ... [more ▼]

The beam-foil source can produce spectra of almost every ion and allows easy measurement of atomic lifetimes of excited levels. Beam-foil spectra have some unique characteristics that made them valuable tool for the term analysis of highly charged ions. As an example, we will describe the work undertaken at Liège on Ne IV and Ne V. Beam-foil is still the only general method for measuring the lifetime of atomic levels in highly charged ions. However, the accuracy of the classical beam-foil method is limited by the non-selective broadband excitation in the foil that populates almost all excitation levels up to very high energy and corrupts by cascading phenomena the normal single-exponential decay curves. We will describe some techniques that have been invented to obviate this infamous “cascading effect”, especially the beam-foil-laser spectroscopy method recently developed in our laboratory. We will present an overview of the beam-foil spectroscopy research performed at the University of Liège together with other recent trends in the field of fast-beam spectroscopy. [less ▲]

Effect of the Polarization and Intensity of the Laser on the Beam-Foil-Laser Interaction

Poster (1995)