Triatomic Hydrogen
Welcome to the Triatomic Hydrogen Group at the Department of Molecular and Optical Physics - University of Freiburg, Germany

Spectroscopy of high n Rydberg States of the Triatomic Deuterium Molecule D3
U. Müller, U. Majer, R. Reichle and M. Braun
Department of Molecular and Optical Physics, Albert-Ludwigs-Universität, Hermann-Herder-Strasse 3, D-79104  Freiburg, Germany


We report first investigations of high principal quantum number Rydberg states of the neutral triatomic deuterium molecule. The experiments were performed using a fast neutral beam photoionization spectrometer recently developed at Freiburg. A fast beam of metastable D3 molecules was created by charge transfer of a D3 + beam in cesium. Rydberg states of D3 were analyzed by pulsed-laser excitation using two-photon resonance-enhanced ionization, electric field ionization and autoionization. Our data identify the 2p 2A 2¨(N = K = 0) state of D3 to be metastable with a lifetime of about 1 µs. The spectral lines following excitation in the ultraviolet spectral range were assigned to s-type and d-type Rydberg-series converging to vibrational ground state, symmetric stretch excited and degenerate mode excited D 3 + ion states. By a combination of vibrationally diagonal and non-diagonal transitions, we determined the ionization potential, the symmetric stretch and degenerate mode vibrational frequencies of the 2p 2A 2¨ state in D3. The data give insight into the influence of the coupling between the Rydberg electron and the ion core on the potential energy surface. ©1997 American Institute of Physics.

©1997 J. Chem. Phys. 106, 7958-67 (1997)

PII: S0021-9606(97)00819-2
doi: 10.1063/1.473803
PACS: 33.80.Eh, 33.80.Rv, 31.50.+w, 33.15.Ry

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