Collisional shift and broadening of the 2p-2s spectral lines in muonic helium ionsстатья

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Дата последнего поиска статьи во внешних источниках: 25 декабря 2013 г.

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[1] Korenman G. Y., Pomerantsev V. N., Popov V. P. Collisional shift and broadening of the 2p-2s spectral lines in muonic helium ions // Physical Review A - Atomic, Molecular, and Optical Physics. — 2013. — Vol. 88, no. 3. — P. 032503–1–032503–8. In connection with the recently proposed Lamb-shift experiments at Paul Scherrer Institute in μ 4He+ and μ 3He+ by using the laser-spectroscopy method, the pressure shift and width of the 2p-2s spectral lines in muonic-helium ions were studied in the present paper within the fully quantum-mechanical close-coupling approach. The calculations of the S matrix as well as of the energy-dependent shift and width were made for collisional energies E=10−5–1 eV. The shift and width averaged over energy were obtained for target temperatures up to 350 K. It is shown that the fine-structure effect does not exceed a few percent. The isotopic effect is very small and can be neglected for the shift at T≥150 K, contrary to the width, for which the isotopic effect becomes much more pronounced at T≥150 K. At density N=2.4145×1018 atom/cm3 corresponding to the target pressure 100 mbar (T=300 K) the predicted values of the shifts are equal to 35 (50) MHz for μ 3He+ and 33 (35) MHz for μ 4He+ respectively for upper (lower) values of the 2p-2s energy-level separation. At the same conditions the values of the widths are equal to 2.4 (13.6) MHz for μ 3He+ and 2.0 (3.0) MHz for μ 4He+. [ DOI ]

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