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MO: Molekülphysik

MO 1: Experimentelle Techniken

MO 1.1: Fachvortrag

Montag, 22. März 2004, 11:00–11:30, HS 332

Autler-Townes effect as a probe of properties of excited molecular states. — •R. Garcia Fernandez¹, A. Ekers¹, J. Klavins², L.P. Yatsenko³, N.N. Bezuglov⁴, O. Kaufmann¹, B.W. Shore¹, and K. Bergmann¹ — ¹FB Physik, TU Kaiserslautern. — ²Dept. of Physics, University of Latvia, Riga. — ³Inst. of Physics of the Academy of Sciences, Kiev, Ukraine. — ⁴V.A. Fock Inst. of Physics, Univ. St.Petersburg, Russia

A novel method for the characterization of highly excited molecular states utilizing the Autler-Townes splitting is demonstrated for Na₂ molecule. The experiment employs a supersonic beam and a cascade scheme X ¹ Σ_g⁺ → A¹ Σ_u⁺ → 5 ¹ Σ_g⁺ (or 6¹ Σ_g⁺), with a cw probe laser in the first step and a cw dressing laser in the second step. The variation of the fluorescence intensities from the intermediate and upper levels with the frequency of the pump and probe lasers contains information about the lifetime and branching ratio of the upper state. These quantities can be easily accessed by a proper choice of the detuning of pump laser from the resonance and the intensity of the probe laser. The lifetime of the 5 ¹ Σ_g⁺ state is measured to be about the same as that of the intermediate A ¹ Σ_u⁺ state, while for 6 ¹ Σ_g⁺ it is twice as large. The 5 ¹ Σ_g⁺ state decays almost exclusively to the A ¹ Σ_u⁺ state, but decay of the 6 ¹ Σ_u⁺ occurs predominantly through other channels.