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Title: Pressure shifts and broadening of the Cs D{sub 1} and D{sub 2} lines by He, N{sub 2}, and Xe at densities used for optical pumping and spin exchange polarization

Abstract

The production of hyperpolarized gases by spin-exchange optical pumping (SEOP) requires exact knowledge of the alkali metal's D{sub 1} absorption profile and the degree to which it is broadened and shifted by varying buffer gas composition and pressure. We have measured these parameters for cesium (Cs) in the presence of Xe, N{sub 2}, and {sup 4}He perturber gases at densities up to 10 amagats. The effects of these gases are important as Cs is attracting increasing interest for SEOP applications. Our measurements were made using simple white-light illumination of the Cs vapor while characterizing the D{sub 1} (6S{sub 1/2} to 6P{sub 1/2}) and D{sub 2} (6S{sub 1/2} to 6P{sub 3/2}) resonances using a high-resolution optical spectrometer. For the Cs D{sub 1} resonance at T=120 deg. C, we report shifts from the 894.59 nm vacuum wavelength caused by {sup 3}He, {sup 4}He, N{sub 2}, and Xe of -0.017{+-}0.003, -0.013{+-}0.002, 0.026{+-}0.002, and 0.029{+-}0.002 nm/amagat. We also report the shifts for the D{sub 2} resonance as well as pressure broadening coefficients for both resonances.

Authors:
;  [1];  [2]
  1. Triangle Universities Nuclear Laboratory, Durham, North Carolina 27708-0308 (United States)
  2. Center for In Vivo Microscopy, Department of Radiology, Duke University, Durham, North Carolina 27708 (United States)
Publication Date:
OSTI Identifier:
21185907
Resource Type:
Journal Article
Journal Name:
Journal of Applied Physics
Additional Journal Information:
Journal Volume: 104; Journal Issue: 9; Other Information: DOI: 10.1063/1.3018181; (c) 2008 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0021-8979
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; ABSORPTION; CESIUM; DENSITY; HELIUM 3; HELIUM 4; ILLUMINANCE; LINE BROADENING; OPTICAL PUMPING; OPTICAL SPECTROMETERS; POLARIZABILITY; POLARIZATION; POTENTIAL ENERGY; RESONANCE; SPECTRAL SHIFT; SPIN EXCHANGE; VAPORS

Citation Formats

Couture, A H, Clegg, T B, University of North Carolina, Chapel Hill, North Carolina 27599-3255, and Driehuys, B. Pressure shifts and broadening of the Cs D{sub 1} and D{sub 2} lines by He, N{sub 2}, and Xe at densities used for optical pumping and spin exchange polarization. United States: N. p., 2008. Web. doi:10.1063/1.3018181.
Couture, A H, Clegg, T B, University of North Carolina, Chapel Hill, North Carolina 27599-3255, & Driehuys, B. Pressure shifts and broadening of the Cs D{sub 1} and D{sub 2} lines by He, N{sub 2}, and Xe at densities used for optical pumping and spin exchange polarization. United States. https://doi.org/10.1063/1.3018181
Couture, A H, Clegg, T B, University of North Carolina, Chapel Hill, North Carolina 27599-3255, and Driehuys, B. Sat . "Pressure shifts and broadening of the Cs D{sub 1} and D{sub 2} lines by He, N{sub 2}, and Xe at densities used for optical pumping and spin exchange polarization". United States. https://doi.org/10.1063/1.3018181.
@article{osti_21185907,
title = {Pressure shifts and broadening of the Cs D{sub 1} and D{sub 2} lines by He, N{sub 2}, and Xe at densities used for optical pumping and spin exchange polarization},
author = {Couture, A H and Clegg, T B and University of North Carolina, Chapel Hill, North Carolina 27599-3255 and Driehuys, B},
abstractNote = {The production of hyperpolarized gases by spin-exchange optical pumping (SEOP) requires exact knowledge of the alkali metal's D{sub 1} absorption profile and the degree to which it is broadened and shifted by varying buffer gas composition and pressure. We have measured these parameters for cesium (Cs) in the presence of Xe, N{sub 2}, and {sup 4}He perturber gases at densities up to 10 amagats. The effects of these gases are important as Cs is attracting increasing interest for SEOP applications. Our measurements were made using simple white-light illumination of the Cs vapor while characterizing the D{sub 1} (6S{sub 1/2} to 6P{sub 1/2}) and D{sub 2} (6S{sub 1/2} to 6P{sub 3/2}) resonances using a high-resolution optical spectrometer. For the Cs D{sub 1} resonance at T=120 deg. C, we report shifts from the 894.59 nm vacuum wavelength caused by {sup 3}He, {sup 4}He, N{sub 2}, and Xe of -0.017{+-}0.003, -0.013{+-}0.002, 0.026{+-}0.002, and 0.029{+-}0.002 nm/amagat. We also report the shifts for the D{sub 2} resonance as well as pressure broadening coefficients for both resonances.},
doi = {10.1063/1.3018181},
url = {https://www.osti.gov/biblio/21185907}, journal = {Journal of Applied Physics},
issn = {0021-8979},
number = 9,
volume = 104,
place = {United States},
year = {2008},
month = {11}
}