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The European Physical Journal A

Observation of integrated state multipoles in collisional excitation of Hg atoms by polarized electrons

Klaus Bartschat, G F Hanne, A. Wolcke

Published Jun 1, 1982• 28 citations
Publisher
DOI
10.1007/bf01414723

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The transfer of excitation from excited mercury atoms to ground-state thallium atoms was investigated using techniques of sensitized fluorescence. A Hg–Tl vapor mixture contained in a quartz cell was irradiated with Hg 2537 Å resonance radiation which caused the mercury atoms to become excited to the 63P1, state. Subsequent collisions between the Hg(63P1) and Tl(62P1/2) atoms resulted in the population of the 82S1/2, 62D, and 72S1/2 thallium states, whose decay gave rise to sensitized fluorescence of wavelengths 3231, 3520, 3776, and 5352 Å. Intensity measurements on the sensitized fluorescence and on the Hg 2537 Å resonance fluorescence, observed at right angles to the direction of excitation, yielded cross sections of 3.0, 0.3, and 0.05 Å2 for collisional excitation transfer from Hg(63P1) to the 82S1/2, 62D, and 72S1/2 states in thallium, respectively. The results are fully consistent with previously determined cross sections for excitation transfer in other binary metallic vapor systems.

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The transfer of excitation energy, induced in inelastic collisions between excited Hg atoms and ground state Zn atoms, was studied using methods of sensitized fluorescence. Hg atoms in a low density Hg–Zn mixture were excited with Hg 2537 Å resonance radiation to the 63P1 state, and interacted with the Zn atoms which became collisionally excited to the 43P1 state and then decayed emitting sensitized fluorescence. Measurements of relative intensities of Hg 2537 Å resonance fluorescence and Zn 3076 Å sensitized fluorescence yielded the cross section of 5.9 × 10−2 Å2 for Hg(63P1) → Zn(43P1) excitation transfer. The addition of small quantities of N2 to the Hg–Zn vapor mixture enhanced the efficiency of the transfer. The cross section for quenching of the Zn 43P1 state by collisions with N2 was found to be 0.19 Å2.

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Polarization properties of the coherent radiation generated by four-wave mixing in Hg

Koichi Tsukiyama∥, Motowo Tsukakoshi, Takahiro Kasuya

Optics Communications•Mar 1, 1991•5 citations
We have measured the alignment of Hg(6 3^{3}3P1{\mathit{P}}_{1}P1​) atoms following off-resonant excitation of the Hg 6 1S0^{1}\mathrm{S}_{0}1S0​--6 3P1^{3}\mathrm{P}_{1}3P1​ transition in the presence of Kr. We present a polarization spectrum for both red and blue wings out to detunings beyond 100 ${\mathrm{cm}}^{\mathrm{\ensuremath{-}}1}$. This represents a considerable extension to the existing results, which has been made possible by the use of a pump-and-probe excitation scheme. In the experiment a pulsed laser, detuned from the resonance, creates an alignment in the upper state. This is probed by tuning a delayed second laser to a higher transition and monitoring laser-induced fluorescence from the two-step process. The alignment of the asymptotic Hg(6 3^{3}3P1{\mathit{P}}_{1}P1​) atoms is determined by comparison of the signals obtained for different relative polarizations of the lasers. We discuss the advantages of this method and the relation of the raw data to the polarizations presented. The results are discussed within the context of a simple quasiclassical model of the process.
The transfer of excitation from excited mercury atoms to ground-state thallium atoms was investigated using techniques of sensitized fluorescence. A Hg–Tl vapor mixture contained in a quartz cell was irradiated with Hg 2537 Å resonance radiation which caused the mercury atoms to become excited to the 63P1, state. Subsequent collisions between the Hg(63P1) and Tl(62P1/2) atoms resulted in the population of the 82S1/2, 62D, and 72S1/2 thallium states, whose decay gave rise to sensitized fluorescence of wavelengths 3231, 3520, 3776, and 5352 Å. Intensity measurements on the sensitized fluorescence and on the Hg 2537 Å resonance fluorescence, observed at right angles to the direction of excitation, yielded cross sections of 3.0, 0.3, and 0.05 Å2 for collisional excitation transfer from Hg(63P1) to the 82S1/2, 62D, and 72S1/2 states in thallium, respectively. The results are fully consistent with previously determined cross sections for excitation transfer in other binary metallic vapor systems.
The transfer of excitation energy, induced in inelastic collisions between excited Hg atoms and ground state Zn atoms, was studied using methods of sensitized fluorescence. Hg atoms in a low density Hg–Zn mixture were excited with Hg 2537 Å resonance radiation to the 63P1 state, and interacted with the Zn atoms which became collisionally excited to the 43P1 state and then decayed emitting sensitized fluorescence. Measurements of relative intensities of Hg 2537 Å resonance fluorescence and Zn 3076 Å sensitized fluorescence yielded the cross section of 5.9 × 10−2 Å2 for Hg(63P1) → Zn(43P1) excitation transfer. The addition of small quantities of N2 to the Hg–Zn vapor mixture enhanced the efficiency of the transfer. The cross section for quenching of the Zn 43P1 state by collisions with N2 was found to be 0.19 Å2.