"Collisional Broadening and Shift of Rubidium 4<sup>2</sup><i>D</i><sub" by Dillon T. Nice

Date of Award

6-2024

Document Type

Thesis

Degree Name

Master of Science

Department

Department of Engineering Physics

First Advisor

Jonathan W. Evans, PhD

Abstract

Line shapes for three rubidium 42D5/2n2F transitions were collected using pump probe spectroscopy. Broadening rates for Rb-He collisions ranged from 139–171 MHz/Torr and shift rates ranged from 113–146 MHz/Torr. Then, line shapes were collected at different alkali densities to measure electron density. Electron density had a clear “runaway ionization density threshold” around 1.5×1013 cm−3. The three transitions agreed within 2% on the observed fractional ionization when calculated using the observed Stark width but did not agree on the observed fractional ionization when calculated using the observed Stark shift. These results indicate that Griem theory can provide reasonable estimates of Ne in an alkali plasma but can not reasonably estimate the observed shift at low buffer gas pressures.

AFIT Designator

AFIT-ENP-MS-24-J-027

Comments

A 12-month embargo was observed for posting this work on AFIT Scholar.

Distribution Statement A, Approved for Public Release. PA case number on file.

Plain-text title form: Collisional Broadening and Shift of Rubidium 4^2D5/2 --> n2F Line Shapes with Helium and Electrons

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