ES: Professional life and Research topics:

1954 and 1955 Research Associate of Harold Urey, Willard Libby and Mark G. Inghram, University of Chicago (first determination of Rb-Sr ages of meteorites, found 4.6 ± 0.3 gigayears)
End 1955 Habilitation for Privatdozent in Physical Chemistry at Univ. of Zürich

12th January 1957 Associate Professor for Inorganic and Physical Chemistry (focusing ion chromatography of inorganic ions; high temperature mass spectrometry with 2nd homebuilt machine).

1959-1964 Full Professor for Inorganic Chemistry, Head of the new Institute for Inorganic Chemistry (molecular beam studies; IR-spectroscopy of low temperature unstable species (discovery of matrix-isolated S3 with Beat Meyer); mass spectrometry of metalorganic complexes; discovery of tripeldecker-sandwich complexes as positive gas phase ions (CpNiCpNiCp+, CpNiCpFeCp+, and CpFeCpFeCp+), where Cp = C5H5-, with R. Taubenest Helv.chim.acta 47,1525(1964), 49,1447(1966); first experiments with ion implantation in semiconductors with R. Taubenest, Helv.chim.acta 46,1295(1963); enrichment of tritium in samples of Greenland ice (with H. Oeschger, Bern)).

1962 (7 mths) Guest Professor at UC of Berkeley (Separation of Actinides Curium to Fermium in 1 sec. for Stan Thompson, Glenn Seaborg; interaction with George Pimentel and Leo Brewer; invention of an electrophoretic method later called "Isotachophoresis", UCRL 10624, 208 (1963), see Schumacher & Studer Helv. chim. acta 47,957(1964)).

1964-1971 Head Research of Ciba Photochemical at Marly, Switzerland
1968 Research Director of Ciba Photochemical Group (Ilford, UK; Lumière, Lyon, France; Gretag, Regensdorf; and Marly)
1968 Professor of Chemistry at U. of Fribourg (part time)

1972-1991 Professor for Inorganic and Physical Chemistry, University of Bern, Switzerland (free Metal Clusters in molecular beams; Laserspectroscopy; Catalysis; Capillary electrophoresis).

1969-1980 Member of the Swiss National Foundation for Scientific Research; 1976-80 President of the Division for Exact Sciences and Mathematics
1980-1981 Dean of the Science Faculty, University of Bern
1983-1996 Member of the Commission for Technology and Innovation (KTI,CTI) of the Federal Department of Economics
1978-1984 Member of the Scientific Advisory Board of the Max Planck Institute for Biophysical Chemistry (Göttingen, Karl Friedrich Bonhoeffer Institute)
1985-1992 Member of the Scientific Advisory Board of the Max Planck Institute for Atomic & Molecular Physics, and Fluid Dynamics (Göttingen)
1992-1993 Member of an international team for the evaluation of EUREKA research projects.

1951 Special Award for outstanding Ph.D. thesis, U. of Zürich
1985 Dr. ès sc.nat. honoris causa of the University of Fribourg, Switzerland
1990 Dr. rer.nat honoris causa of the Federal Institute of Technology (ETH), Zürich

1974 and later: Member of Editorial Boards of Scientific Journals, e.g. Chemical Physics Letters, Zeitschrift für Physik A, Chimia, Match (Journal for Mathematical Chemistry)...

1959-1964 Member of the Board of Directors of Monsanto Research Laboratories, Zürich

1961_03, 1961_07, 1978 and 1985 one week courses for the Swiss Gymnasium Science Teachers in several fields of Chemistry
1951-56 Production of the Argon-Isotope 38Ar in an isotopic purity of 99.97 % ("Zurich-Spike", with K. Clusius) and from 1974-92 in an optimized thermal diffusion column of 54 m length with > 99.9999 % ("Bern-Spike", with U. Grünwald) for the community of Geochronologists, applying the Potassium-Argon dating method. Production of 35Cl, 37Cl, 79Br, 81Br, and Si-Isotopes in high purity for scientific applications, e.g. >99 % I37Cl and I35Cl for intracavity filters in isotope separation of the chlorine isotopes by laser irradiation.

Selected from last papers:
  • Review paper: "Metal Clusters: Between Atom and Bulk", Chimia 42(1988)357-376
  • "Some Rules are better than others", Chimia 48(1994)2629
  • "Na6Pb, an exceptionally stable Cluster", C. Yeretzian, U. Röthlisberger & ES, Chem.Phys.Lett. 237(1995)334
  • "Metal-Metal Coordination Chemistry: Free Clusters of Group 11 Elements with Sodium", U. Heiz, A. Vayloyan & ES, J.Phys.Chem. 100(1996)15033-15040(785 kB)
  • "NaxAu and CsxAu bimetal Clusters: Finite size analogs of sodium-gold and caesium-gold compounds", U.Heiz, A. Vayloyan, ES, C. Yeretzian, M. Stener, P. Gisdakis, and N. Rösch, J.Chem.Phys. 105(1996)5574-5585(221 kB)
  • "A new source for the generation of binary metal clusters", U. Heiz, A. Vayloyan & ES, Rev.Sci.Instrum. 68(1997)3718

Other activities, especially after retirement (1991):
From 1976 to 1991 many computer programs were developed in several fields of Chemistry for the students in my courses (General Chemistry, Inorganic Chemistry, Chemical Kinetics, Quantum Chemistry, Spectroscopy, Statistical Thermodynamics, History of Chemistry, Chirality, and Chaos in Chemistry). These programs have now been given an attractive front end and many more have been written. They tend to go beyond the teaching aspects and may be helpful in research as well. Some of them, e.g. ChemEdu, also treat phenomena covered in high-school chemistry.
Available: GasSim, Statistical Thermodynamics, Spectroscopy, Chemical Kinetics, Chemical Education, see links.

My maxim:
Not too old to learn! (while I can ...)