19 research outputs found

    Zeeman Relaxation of Cold Atomic Iron and Nickel in Collisions with 3He

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    We have measured the ratio of the diffusion cross-section to the angular momentum reorientation cross-section in the colliding Fe-3He and Ni-3He systems. Nickel (Ni) and iron (Fe) atoms are introduced via laser ablation into a cryogenically cooled experimental cell containing cold (< 1 K) 3He buffer gas. Elastic collisions rapidly cool the translational temperature of the ablated atoms to the helium temperature. The cross-section ratio is extracted by measuring the decays of the atomic Zeeman sublevels. For our experimental conditions, thermal energy is comparable to the Zeeman splitting. As a result, thermal excitations between Zeeman sublevels significantly impact the observed decay. To determine the cross-section ratio accurately, we introduce a model of Zeeman state dynamics that includes thermal excitations. We find the cross-section ratio for Ni-3He = 5 x 10^3 and Fe-3He <= 3 x 10^3 at 0.75 K in a 0.8 T magnetic field. These measurements are interpreted in the context of submerged shell suppression of spin relaxation as studied previously in transition metals and rare earth atoms.Comment: 10 pages, 5 figures; submitted to Phys. Rev.

    Ponderomotive light squeezing with atomic cavity optomechanics

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    Accessing distinctly quantum aspects of the interaction between light and the position of a mechanical object has been an outstanding challenge to cavity-optomechanical systems. Only cold-atom implementations of cavity optomechanics have indicated effects of the quantum fluctuations in the optical radiation pressure force. Here we use such a system, in which quantum photon-number fluctuations significantly drive the center of mass of an atomic ensemble inside a Fabry-Perot cavity. We show that the optomechanical response both amplifies and ponderomotively squeezes the quantum light field. We also demonstrate that classical optical fluctuations can be attenuated by 26 dB or amplified by 20 dB with a weak input pump power of < 40 pW, and characterize the optomechanical amplifier's frequency-dependent gain and phase response in both the amplitude and phase-modulation quadratures

    Nathan Ukalović, klarinet : drugi dio diplomskog ispita

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    Drugi dio diplomskog ispita Nathana Ukalovića (klarinet), studenta Muzičke akademije u Zagrebu. Ispit je održan na Muzičkoj akademiji u dvorani "Stančić" 30.9.2021. Klavirska pratnja: Marina Matolić; mentor: Davor Reba. Program: 1. Gioacchino Rossini: Introdukcija, tema i varijacije za klarinet i orkestar; 2. Jörg Widmann: Fantasie; 3. Johannes Brahms: Sonata za klarinet op. 120, br. 2

    Sonate n °3 en ré mineur op 108 pour violon et piano / Johannes Brahms ; Nathan Milstein, vl ; Vladimir Horowitz, p

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    Titre uniforme : Brahms, Johannes (1833-1897). Compositeur. [Sonates. Violon, piano. No 3. Op. 108. Ré mineur]BnF-Partenariats, Collection sonore - BelieveContient une table des matière
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