Gap tips prepared f ran whiskers grown by the vapour phase reaction, were analyzed using our ctmbined-type atom-probe FIM by laser pulse operation instead of high voltage pulse operation. It was found that ( 1 ) The mposition is Ga : P=l : l at cryogenic temperature 45K in vacuum of better than 1 x 10-Ptorr. ( 2 ) Much more cluster ions of phosphorus atan in laser pulse mode are detected in can...

A precipitation hardened maraging TRIP steel was analyzed using a pulsed laser atom probe. The laser pulse energy was varied from 0.3 to 1.9 nJ to study its effect on the measured chemical compositions and spatial resolution. Compositional analyses using proximity histograms did not show any significant variations in the average matrix and precipitate compositions. The only remarkable change in...

Nowadays it is a standard technique to produce a BoseEinstein condensate in the laboratory [?,?]. In order to build a coherent source of atoms, an atom laser, a major achievement was the coherent extraction of atoms from an atomic trap. At first a pulsed atom laser was built [?,?], recently also continuous wave atom lasers have been realized [?,?]. A short survey over the experimental situation...

Considering the recent developments of the pulsed laser in the femtosecond domain, the possibility of conceiving a new laser assisted Tomographic Atom Probe has been nvisaged. The instrument is able to map out the 3D distributions of the atomic positions in a The interest of the terial sciences has already been demonstrated many times [3,4]. However, since HV mples have to be electrically good ...