10.1016/j.jqsrt.2021.107879">
 

Rubidium excited state line shapes from 5P to 5D and 7S broadened by helium

Document Type

Article

Publication Date

11-2021

Abstract

Pump modulated laser absorption spectroscopy was used to measure five excited state line shapes for electric dipole allowed transitions beginning in the Rb manifold. Helium was used as the collisional buffer gas, with pressures from 0 to 250 Torr. Center frequency, FWHM, and asymmetry parameters were extracted from the fits and plotted versus pressure to determine rates. Lines terminating in the Rb 5P manifold had collisional broadening rates, 𝛾 , of 49.5–54.6 MHz/Torr, collisional shift rates, δ, of less than ±1.3 MHz/Torr, and asymmetry rates, ß0, of less than ±0.08 mrad/Torr. Lines terminating in the 72S1/2 state showed significantly higher rates, with broadening rates of 109.1–111.0 MHz/Torr, shift rates of 11.5–13.3 MHz/Torr, and asymmetry rates of 0.28–0.47 mrad/Torr. These trends qualitatively match numerically computed difference potentials, which also predict large rates for the 7S lines and smaller rates for the 5D lines.

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Source Publication

Journal of Quantitative Spectroscopy and Radiative Transfer

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