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
Journal Article
·
· Journal of Applied Physics
- Triangle Universities Nuclear Laboratory, Durham, North Carolina 27708-0308 (United States)
- Center for In Vivo Microscopy, Department of Radiology, Duke University, Durham, North Carolina 27708 (United States)
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.
- OSTI ID:
- 21185907
- Journal Information:
- Journal of Applied Physics, Journal Name: Journal of Applied Physics Journal Issue: 9 Vol. 104; ISSN JAPIAU; ISSN 0021-8979
- Country of Publication:
- United States
- Language:
- English
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