Enhanced polarization and mechanisms in optically pumped hyperpolarized He3 in the presence of He4

Hsin Hsien Chen, Hong Chang Yang, Herng-Er Horng, Y. Y. Lee, Shu-Hsien Liao, S. Y. Yang, Chung Hsien Chou, Lieh Jeng Chang, M. J. Chen, M. Y. Chern

    Research output: Contribution to journalArticle

    3 Citations (Scopus)

    Abstract

    This work reports an enhanced polarization and mechanisms in optically pumped (OP) hyperpolarized He3 in the presence of He4. The cells contain Rb metal, 60-torr N2, and different pressures of He3 and He4. In the absence of He4, the polarization of He3 increases monotonically from 4.5% to 8% when the pressure of He3 is increased from 300 to 1500 torr. In the presence of 1850-torr He4 gas, the polarization of He3 is enhanced from 7% to 30% for a cell containing 600-torr He3 and 60-torr N2. The wall relaxation factors X for OP cells with and without buffering He4 gas were derived. It was found that the He4 gas confines the He3 atoms to a diffusion-limited region which effectively reduces the wall relaxation factor X. Mechanisms contributed to relaxation are addressed and discussed.

    Original languageEnglish
    Article number033422
    JournalPhysical Review A - Atomic, Molecular, and Optical Physics
    Volume81
    Issue number3
    DOIs
    Publication statusPublished - 2010 Mar 26

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    ASJC Scopus subject areas

    • Atomic and Molecular Physics, and Optics

    Cite this

    Enhanced polarization and mechanisms in optically pumped hyperpolarized He3 in the presence of He4. / Chen, Hsin Hsien; Yang, Hong Chang; Horng, Herng-Er; Lee, Y. Y.; Liao, Shu-Hsien; Yang, S. Y.; Chou, Chung Hsien; Chang, Lieh Jeng; Chen, M. J.; Chern, M. Y.

    In: Physical Review A - Atomic, Molecular, and Optical Physics, Vol. 81, No. 3, 033422, 26.03.2010.

    Research output: Contribution to journalArticle

    Chen, Hsin Hsien ; Yang, Hong Chang ; Horng, Herng-Er ; Lee, Y. Y. ; Liao, Shu-Hsien ; Yang, S. Y. ; Chou, Chung Hsien ; Chang, Lieh Jeng ; Chen, M. J. ; Chern, M. Y. / Enhanced polarization and mechanisms in optically pumped hyperpolarized He3 in the presence of He4. In: Physical Review A - Atomic, Molecular, and Optical Physics. 2010 ; Vol. 81, No. 3.
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    abstract = "This work reports an enhanced polarization and mechanisms in optically pumped (OP) hyperpolarized He3 in the presence of He4. The cells contain Rb metal, 60-torr N2, and different pressures of He3 and He4. In the absence of He4, the polarization of He3 increases monotonically from 4.5{\%} to 8{\%} when the pressure of He3 is increased from 300 to 1500 torr. In the presence of 1850-torr He4 gas, the polarization of He3 is enhanced from 7{\%} to 30{\%} for a cell containing 600-torr He3 and 60-torr N2. The wall relaxation factors X for OP cells with and without buffering He4 gas were derived. It was found that the He4 gas confines the He3 atoms to a diffusion-limited region which effectively reduces the wall relaxation factor X. Mechanisms contributed to relaxation are addressed and discussed.",
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    AU - Chen, Hsin Hsien

    AU - Yang, Hong Chang

    AU - Horng, Herng-Er

    AU - Lee, Y. Y.

    AU - Liao, Shu-Hsien

    AU - Yang, S. Y.

    AU - Chou, Chung Hsien

    AU - Chang, Lieh Jeng

    AU - Chen, M. J.

    AU - Chern, M. Y.

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    AB - This work reports an enhanced polarization and mechanisms in optically pumped (OP) hyperpolarized He3 in the presence of He4. The cells contain Rb metal, 60-torr N2, and different pressures of He3 and He4. In the absence of He4, the polarization of He3 increases monotonically from 4.5% to 8% when the pressure of He3 is increased from 300 to 1500 torr. In the presence of 1850-torr He4 gas, the polarization of He3 is enhanced from 7% to 30% for a cell containing 600-torr He3 and 60-torr N2. The wall relaxation factors X for OP cells with and without buffering He4 gas were derived. It was found that the He4 gas confines the He3 atoms to a diffusion-limited region which effectively reduces the wall relaxation factor X. Mechanisms contributed to relaxation are addressed and discussed.

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