Collision effects in velocity-selective optical pumping of sodium

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dc.contributor Aalto-yliopisto fi
dc.contributor Aalto University en
dc.contributor.author Aminoff, C. G.
dc.contributor.author Javanainen, Juha
dc.contributor.author Kaivola, Matti
dc.date.accessioned 2015-04-23T09:00:31Z
dc.date.available 2015-04-23T09:00:31Z
dc.date.issued 1983
dc.identifier.citation Aminoff, C. G. & Javanainen, Juha & Kaivola, Matti. 1983. Collision effects in velocity-selective optical pumping of sodium. Physical Review A. Volume 28, Issue 2. P. 722-737. ISSN 1094-1622 (electronic). ISSN 1050-2947 (printed). DOI: 10.1103/physreva.28.722. en
dc.identifier.issn 1094-1622 (electronic)
dc.identifier.issn 1050-2947 (printed)
dc.identifier.uri https://aaltodoc.aalto.fi/handle/123456789/15757
dc.description.abstract We report on a quantitative experimental investigation of velocity-changing collisions by means of velocity-selective optical pumping (VSOP). We have calculated the VSOP line shape for an atom with hyperfine structure with the use of two phenomenological kernels for the collision effects: the Keilson-Storer kernel, and a two-term kernel consisting of a broad Keilson-Storer part and a narrower Gaussian component. Corrections were included to account for the finite absorption in the sample and the backward reflection of the pumping beam. The experiments were carried out in sodium vapor with neon as the perturber gas. The D1 line of sodium was used for optical pumping, and the orientation of the ground state was detected. Free parameters of the theory were determined by fitting the predicted line shapes to experimental curves. The Keilson-Storer kernel proved unsatisfactory, but the two-term kernel reproduced well the observed line shapes over the entire collision profiles in the neon pressure range 0-57 mtorr. In an independent experiment using rapidly modulated VSOP we also measured directly the cross section of velocity-changing collisions: σ=(1.13±0.10)×10exp−14 cm2. The large weight obtained for the narrow Gaussian from the fits, as well as the collision cross section which is three times as large as the cross section deduced from tabulated gas kinetic radii, may indicate the presence of collisions with relatively small velocity changes in addition to hard-sphere encounters. en
dc.format.extent 722-737
dc.format.mimetype application/pdf en
dc.language.iso en en
dc.publisher American Physical Society (APS) en
dc.relation.ispartofseries Physical Review A en
dc.relation.ispartofseries Volume 28, Issue 2
dc.rights © 1983 American Physical Society (APS). http://www.aps.org en
dc.subject.other Physics en
dc.title Collision effects in velocity-selective optical pumping of sodium en
dc.type A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä fi
dc.description.version Peer reviewed en
dc.rights.holder American Physical Society (APS)
dc.contributor.school Perustieteiden korkeakoulu fi
dc.contributor.school School of Science en
dc.contributor.department Teknillisen fysiikan laitos fi
dc.contributor.department Department of Applied Physics en
dc.subject.keyword velocity-selective optical pumping en
dc.subject.keyword VSOP en
dc.subject.keyword velocity-changing collisions en
dc.subject.keyword sodium en
dc.subject.keyword kernels en
dc.subject.keyword line shape en
dc.identifier.urn URN:NBN:fi:aalto-201504232414
dc.type.dcmitype text en
dc.identifier.doi 10.1103/physreva.28.722
dc.type.version Final published version en


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