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Bulletin of the American Physical Society

Two-photon spectroscopy of the $2s3d~^1D_2$ level of neutral beryllium-9

Eryn C. Cook, Lucy Lin, Esther Kerns, Chelsea Perez, W.S.C. Williams

Published May 28, 2019• 0 citations
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Effect of temperature on the absorption of rubidium vapor cell D2 line studied by two-photon absorption spectroscopy

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In this research, the effect of temperature on the absorption of rubidium vapor cell D2 line was studied by Two-photon absorption spectroscopy. The diameter and length of cylindrical rubidium vapor cell used in this research are 25.65 mm and 82.12 mm, respectively. The temperature of rubidium cell was varied from room temperature to approximately 80 °C using a peltier-thermoelctric module. The laser diode at 778 nm was used as a light source for two-photon absorption spectroscopy. The absorption spectra of rubidium D2 hyperfine transitions were recorded in the range of 200-1100 nm .The results show that the absorption peak at high temperature is higher than that of lower temperature.

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Two-photon spectroscopy of the 2s3d 1D22s3d~^1D_22s3d 1D2​ level of neutral beryllium-9
Photoionisation des Beryllium atoms: Ziel dieser Arbeit war, eine Quelle für die Erzeugung von Beryllium-Photoionen zu konfigurieren und zu bauen um mit ihnen die sympathetische Laserkühlung hochgeladener Ionen in einer kryogenischen Paulfalle zu ermöglichen.Als atomphysikalischer Mechanismus bietet sich die Zwei-Photonen-Anregung neutraler Beryllium Atome an, bei der der resonante Übergang 1s 2 2s 2 1 S 0 → 1s 2 2s2p 1 P 1 des Atoms bei 235 nm von einer nichtresonanten Transfer des Elektrons ins Kontinuum gefolgt wird.Der apparative Aufbau, die Erzeugung und Anregung des Atomstrahls sowie die Ionenproduktion und Nachweis werden beschrieben.Die experimentellen Ergebnisse betreffen die Untersuchung der Doppler Verbreiterung und der intensitätsabhängigen Sättigung des Übergangs sowohl für die Fluoreszenz-als auch für die Ionenspektren.Schließlich wurden die Wirkungsquerschnitte für den Zwei-Photon-Prozess abgeschätzt.Der Aufbau erfüllt die an ihn gestellten Erwartungen und wird in das Hauptexperiment CryPTEx implementiert. Photoionization of the beryllium atom:The task of this thesis was to configure and build a source of beryllium photoions in order to sympathetically cool highly charged ions in a cryogenic Paul trap with them.A suitable process for this purpose is the two-photon ionization of neutral beryllium atoms that is achieved by a resonant excitation of the 1s 2 2s 2 1 S 0 → 1s 2 2s2p 1 P 1 transition at 235 nm of the atom followed by the non-resonant transfer of an electron to the continuum.The instrumental setup, the generation and excitation of the atomic beam and the production and detection of ions are described.The experimental results concern studies of the Doppler broadening and saturation intensity on both fluorescence and ion spectra.Finally the cross sections were estimated for the two photon process.The setup fulfills the required specifications and is being implemented in the main experiment CryPTEx.V VII 4 Experimental results 4.1 Characterization of the atomic beam . . . . . . . . . . . . . . . . .4.1.1Doppler shift and broadening calculation . . . . . . . . . . .4.1.2Results . . . . . . . . . .
In this research, the effect of temperature on the absorption of rubidium vapor cell D2 line was studied by Two-photon absorption spectroscopy. The diameter and length of cylindrical rubidium vapor cell used in this research are 25.65 mm and 82.12 mm, respectively. The temperature of rubidium cell was varied from room temperature to approximately 80 °C using a peltier-thermoelctric module. The laser diode at 778 nm was used as a light source for two-photon absorption spectroscopy. The absorption spectra of rubidium D2 hyperfine transitions were recorded in the range of 200-1100 nm .The results show that the absorption peak at high temperature is higher than that of lower temperature.