text: In the 70th experimental research at the Hartmann Institute of physical chemistry focused  on ion-molecule reactions using ion-cyclotron resonance spectroscopy with K.-P. Wanczek as leading researcher who 1976 became professor at the University of Bremen. The theoretical foundations of this research were developed in collaboration with K.-M.. Chung, M. W. Morsy, and D. Schuch theoretical physicists working at Hartmann's Institute for Theoretical Chemistry. Since 1973 H. Hartmann also had a small research institute at his place of living in Glashütten (Taunus) supported by the Mainzer Akademie der Wissenschaften und Literatur. Together with K.-M. Chung, D. Schuch, W. Ulmer and B. Zeiger a unified understanding of molecular interactions was developed based on a nonlinear Schrödinger equation. Hartmann thereby pioneered the discovery of one self-interacting field as the foundation of chemistry.  H. Hartman emerited in 1982  and died two years later.
  H. Hartmann was honoured as member of the Deutsche Akademie der Naturforscher Leopoldina, the Gesellschaft Österreichischer Chemiker, the Accademia Nazionale die Lincei, the Royal Danish Academy of Sciences and Letters, the Comitato Premio of Fondazione Balzan, the  International Academy of Quantum Molecular Science, and the Akademie der Wissenschaften und der Literatur zu Mainz.