L. Borucki - H.W. Becker - F. Gorris - S. Kubsky - W.H. Schulte - C. Rolfs
Institut für Physik mit Ionenstrahlen, Ruhr-Universität Bochum, Bochum, Germany
Received: 1 March 1999 Communicated by B. Povh
The energy spread of atomic and molecular ion beams from the 4 MV Dynamitron tandem accelerator at the Ruhr-Universität Bochum has been studied and in part minimized. Using the ER = 6.40 MeV narrow resonance in 1H(15N,)12C with an 15N energy spread of 4.55 keV, the Doppler broadening for several hydrogen-bearing gases was found to be in good agreement with expectation: e.g. for NH3 gas a rotational-vibrational Doppler width of keV was observed (theory = 10.4 keV). Studies of the vibrational Doppler widths of H-bonds on a Si surface were performed using a -ray detection system together with UHV-chambers for sample preparation, transport, and analysis. The results showed that further improvements in the experimental set-ups are needed for such investigations.