Abstract
IR photo-dissociation spectra of SF6 clusters have been studied. A He-seeded molecular beam has been attenuated by crossing it with a line tunable cw CO2 laser of moderate power. — In the electron bombardment beam ionizer (E el=100eV) small neutral clusters are found to fragment predominantly to the main monomer mass (SF +5 ). — Predissociation spectra have been calculated for clusters containing up to six SF6-molecules invoking the dipole-dipole resonance force to lift the degeneracy of the molecule — excited molecule interaction. On the basis of these spectra, dimer and trimer concentrations have been determined quantitatively, for different molecular beam conditions.
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The nozzle is a cheap Pt-Ir lens fabricated for an electronmicroscope (Siemens or Philips). It is soft-soldered to a stainless-steel pipe (3 mm Ø). This pipe is enclosed by a copper block, cooled by contact with a liquid nitrogen reservoir and stabilized by the energy dissipation of a transistor. The temperature of the block can be controlled from 100 to 300 K
The help of Dr. H. Bluyssen and A. van Etteger who provided us with their well fuctioning CO2 laser and many advices is gratefully acknowledged
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This work is part of the research program of the “Stichting Fundamenteel Onderzoek der Materie (F.O.M.)” and has been made possible by financial support from the “Nederlandse Stichting voor Zuiver-Wetenschappelijk Onderzoek (Z.W.O.)”.
We thank F. Lapoutre for his valuable assistance.
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Geraedts, J., Stolte, S. & Reuss, J. Vibrational predissociation of SF6 dimers and trimers. Z Physik A 304, 167–175 (1982). https://doi.org/10.1007/BF01414731
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DOI: https://doi.org/10.1007/BF01414731