By Professor Dr. Dr. h.c. Hermann Haken, Professor Dr. Hans Christoph Wolf (auth.)
This textbook introduces the molecular physics and quantum chemistry had to comprehend the actual houses of molecules and their chemical bonds. It follows the authors' prior textbook "The Physics of Atoms and Quanta" and offers either experimental and theoretical basics for college students in physics and actual and theoretical chemistry. the hot variation treats new advancements in components similar to high-resolution two-photon spectroscopy, ultrashort pulse spectroscopy, photoelectron spectroscopy. specific emphasis is laid at the optical research of unmarried molecules in condensed section. eventually, the constructing box of molecular electronics is gifted, together with electroluminescence and light-emitting diodes.
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Extra info for Molecular Physics and Elements of Quantum Chemistry: Introduction to Experiments and Theory
T stands for temperature, since the molecules have a mean energy kT in the collisions. The electronic wavefunctions are also not sharply bounded. 74 A from spectroscopic data for the equilibrium distance of the centres of gravity of the two H nuclei in H2. 2 The Shapes of Molecules Molecules are spherical only in rare cases. In order to investigate their spatial structures, one has to determine both the arrangement of their nuclear frameworks and also the distributions and extensions of their electronic shells.
E. the bond lengths of the atomic nuclei which make up the molecule and their relative orientations to one another, can be determined very precisely. Aside from X-ray, electron and neutron diffraction, spectroscopic methods such as infrared absorption spectroscopy and nuclear magnetic resonance (NMR) are required for this determination; they will be treated in detail later in this book. 3 as examples. The precision with which these data can be derived from an analysis of electron and X-ray diffraction on ordered structures is very great.
E. circular dichroism. It is caused by the asymmetric arrangement of the atoms in the molecule. Particularly in the case of large molecules, one can learn something about the asymmetry of the electron density in the molecule from this effect. 40 3 Molecules in Electric and Magnetic Fields ,'" , f \ \ I I \ \ ,/ \~ /V Detector .... ;' , .... Scattered intensity Po (~) Fig. 7. Rayleigh scattering depends in a characteristic way on the scattering angle e. The diagram shows the spatial distribution (in the plane) of the light intensity scattered by an isotropic, spherical sample.