Thursday, April 2, 2009, 16:00
WHGA Auditorium
F. Merkt, ETH Zürich
Abstract:
Rydberg states are electronically excited states, the spectral position
of which can be described by Rydberg's well-known formula [1]. Rydberg
states of atoms and molecules possess very unusual physical properties
which all scale as integer multiples of the principal quantum number n
[2], their polarizability as n^7, the van der Walls interaction between
two Rydberg atoms or molecules as n^11, the maximal electric dipole that
can be induced by an electric field as n^4, the threshold field for field
ionization as n^-4, the spacing between adjacent states of a given
Rydberg series as n^-3, the absorption cross section from the ground
state as n^-3, the transition moment between neighboring Rydberg states
as n^2, their lifetime as n^3, etc. These physical properties and their
rapid variation with n form the basis of a growing number of
applications of Rydberg states in chemistry and physics.
The talk will begin with an overview of the properties of Rydberg states and their applications in physics and chemistry. Then, the close relationship between Rydberg states, electron-ion collisions and photoionization will be explained and illustrated by recent high-resolution spectroscopic investigations, using ultra-narrow VUV laser sources and millimeter-wave radiation sources, in which the role of nuclear spins in high Rydberg states, in electron-ion collisions and in photoionization could be studied in detail for the first time, both in atomic [4] and molecular [5] systems.
The last part of the talk will be devoted to a description of new experiments in which we have used the large dipole moments (more than 1000 Debye) that can be induced by electric fields in high Rydberg states to control their translational motion and to generate samples of translationally cold (T < 1K) atoms and molecules [6,7].
[1] J. R. Rydberg, Z. Phys. Chem. 5, 227 (1890)
[2] T. F. Gallagher, Rydberg Atoms (Cambridge University Press,
Cambridge 1994)
[3] Ch. Jungen (Ed.), Molecular Applications of Quantum Defect Theory
(IOP Publishing, Bristol, 1996)
[4] H. J. Wörner, M. Grütter, E. Vliegen and F. Merkt, Phys. Rev. A 71,
052504 (2005)
[5] H. J. Wörner, S. Mollet, Ch. Jungen and F. Merkt, Phys. Rev. A 75,
062511 (2007)
[6] E. Vliegen, H. J. Wörner, T. P. Softley and F. Merkt, Phys. Rev.
Lett. 92, 033005 (2004)
[7] S. D. Hogan and F. Merkt, Phys. Rev. Lett. 100, 043001 (2008)