2018 Impact factor 2.481
Hadrons and Nuclei
Eur. Phys. J. A 5, 327-336

Hydrogen doppler spectroscopy using 15N ions

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

Abstract
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,$\alpha\gamma$)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 $10.41 \pm 0.25$ keV was observed (theory = 10.4 keV). Studies of the vibrational Doppler widths of H-bonds on a Si $\langle 100 \rangle$surface were performed using a $4\pi$ $\gamma$-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.


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