M Vrakking | PubMed Health

PubMed2000

Slow photoelectron imaging.

Experiments are reported on the detection of slow photoelectrons resulting from the photoionization of Xe atoms in a dc electric field by electron imaging. In the far-field photoelectron velocity distributions we can distinguish between direct and indirect ionization processes (involving long range Coulomb interactions with the Xe+ ion). Also, a new modulation of the velocity distribution is observed which cannot be explained by previously discussed mechanisms. Classical and quantum mechanical calculations are presented to support the interpretations.

Journal Article↗

PubMed1989

Late follow-up after surgical correction of atrial septal defect of the secundum type.

From more than 500 survivors of surgery for atrial septal defect of the secundum type (ASD II) operated upon between 1953 and 1965, 50 consecutive patients with an age of less than 6 years at the time of operation and 50 consecutive patients with an age of over 20 years at time of operation were chosen. Minimum follow-up in all cases was 20 years. In the younger age group there was a greater return to normal ECG and normal chest x-ray and patients had a normal exercise tolerance at late follow-up. When surgery was performed at an adult age fewer patients had normal ECGs and chest x-ray postoperatively, and overall there was a lower functional class postoperatively. There was, however, still a good longterm survival. Atrial arrhythmias developed in a considerable number of patients postoperatively and can develop even late after surgery in all age groups.

Adult↗