Bonn 2000 – wissenschaftliches Programm
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MO: Molekülphysik
MO 19: Poster II: Spektroskopie
MO 19.7: Poster
Donnerstag, 6. April 2000, 17:00–19:30, Aula
Spectroscopy of Rydberg states of H3 molecules. — •I. Mistrik1, R. Reichle1, H. Helm1, U. Müller1, M. Jungen2, and J. Stephens3 — 1Fak. f. Physik, Univ. Freiburg, Stefan-Meier-Str.19, 79104 Freiburg — 2Institute of Physical chemistry, Univ. Basel, Klingelbergstrasse 80, 4056 Basel,Switzerland — 3International Atomic Energy Agency, Wagramer Strasse 5, Vienna, Austria A-1400
Rydberg series of H3 converging to various rovibrationally excited ionic thresholds are investigated experimentally and theoretically. Autoionizing high principal quantum number Rydberg states of a H3 are excited using a two-photon excitation scheme from the metastable level 2pA2". To interpret the measured spectra we use the MQDT model which includes rotational[1], vibrational and Jahn-Teller coupling mechanisms[2]. From the Rydberg spectra we also gain insight into the intermediate state. We propose the assignment of two n=3 states of H3 as a doublet 3pE′(ν 2=1) splitted by the Jahn-Teller effect. We also investigate the lineshape in two-photon ionization via low n Rydberg states. The structure of the spectral lines reflects the dynamics of the Rydberg states in the pulsed laser field.
This work is supported by DFG (SFB 276, TP C13).
[1] R. Reichle, I. Mistrik, U. Müller, and H. Helm, Phys. Rev. A 60, (5) 3929 (1999).
[2] I. Mistrik, R. Reichle, U. Müller, H.Helm, M. Jungen and J. Stephens, Accepted in Phys. Rev. A.