Bulletin of the American Physical Society
85th Annual Meeting of the APS Southeastern Section
Volume 63, Number 19
Thursday–Saturday, November 8–10, 2018; Holiday Inn at World’s Fair Park, Knoxville, Tennessee
Session D05: Poster Session (6:00pm-7:30pm)
6:00 PM,
Thursday, November 8, 2018
Holiday Inn Knoxville Downtown
Room: Atrium
Abstract ID: BAPS.2018.SES.D05.70
Abstract: D05.00070 : Enhancing the Ruby Phosphorescence Senior Lab: the Cr3+ 2E Lifetimes and 4T Absorption Studies.*
Presenter:
Zack Jones
(Appalachian State University)
Authors:
Zack Jones
(Appalachian State University)
Julia Hinds
(Appalachian State University)
Sophia Woznichak
(Appalachian State University)
William Dulaney
(Appalachian State University)
Christer R Akouala
(Appalachian State University)
Anthony G Calamai
(Appalachian State University)
Many existing advanced laboratory experiences associated with the metastable 2E term of Cr3+ in ruby, which gives rise to the R-lines at 692.7 and 694.3 nm, focus on a room-temperature measurement of the radiative lifetime of the 2E term. In our local work developing a laboratory experience in atomic phosphorescence, we noted a lack of consistency in the literature for the lifetime of the Cr3+ 2E term. These projects typically use commercially available ruby spheres for which the manufacturer(s) only state about a 2% Cr3+ concentration. The uncertainty in Cr concentration represents one source of systematic error for this laboratory experience. We present our measured lifetime with corrections for systematic issues that make this project a more rewarding experience for students. Our result for the room-temperature radiative-lifetime for the 2E term is 3.3 ± 0.1 ms; which, unlike some more recent reports (e.g. [1]), compares favorably with that of Nelson and Sturge [2]. In order to address the uncertainty in sample Cr concentration, our laboratory has recently begun a detailed study of the Cr3+ 4T absorption using commonly available advanced-physics lab equipment. We also provide a status report on that aspect of our work to enhance this laboratory activity.
*NASA/NC-Space Grant
To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2018.SES.D05.70
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