Berlin 2001 – wissenschaftliches Programm
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MO: Molekülphysik
MO 12: Posters Friday: Spectroscopy
MO 12.9: Poster
Freitag, 6. April 2001, 12:30–15:00, AT3
Vibronic levels of para triatomic hydrogen. — •I. Mistrik1, R. Reichle1, U. Müller1, H. Helm1, and M. Jungen2 — 1Fak. f. Physik, Univ.Freiburg, Herman-Herdern-Str. 3, 79104 Freiburg — 2Institute of Physical chemistry, Univ.Basel, Klingerbergstrasse 80, 4056 Basel, Switzerland
The metastability of H3 in the para form (I=1/2) is exploited in a
photoexcitation study to investigate the vibronic structure of this
molecule.
From the rovibrational energy
level positions of the doubly degenerate 3pE′ electronic state we
suggest
a novel interaction mechanism
between the upper and the lower Jahn-Teller sheet of this state.
Vibronic interactions in the 3pE′ state were also investigated by
measuring
high Rydberg states in a two photon excitation scheme[1,2].
Lifetime measurements[3] of low
Rydberg states of H3 give further information on coupling
mechanisms
between singly excited Rydberg states as well as possible crossings with
the
lowest repulsive doubly excited states of H3. A theoretical
investigation
of the dynamics of the Rydberg states based on the ab initio
potential energy surfaces will be presented at the conference.
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, Phys. Rev. A 61, (1) 033410 (2000).
[3] I. Mistrik, R. Reichle, U. Müller, H.Helm, accepted to Phys. Rev. A (2001)