Collisional transitions between HFS statesof antiprotonic 3He in the presenceof microwave radiationстатья

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[1] Yudin S. N., Korenman G. Y. Collisional transitions between hfs statesof antiprotonic 3he in the presenceof microwave radiation // Hyperfine Interactions. — 2012. — Vol. 209, no. 1-3. — P. 21–24. We consider collisional effects on the transitions between HFS states of ({p} 3He+) in the presence of microwave radiation. Cross sections and rates of collisional HFS transition, density shifts and broadening of M1 spectral lines are calculated within the approach developed previously for ({p} 4He+). The values averaged over thermal motion are used in the quantum master equation for the density matrix of HFS states in the microwave field. At the target density 3 × 10^20 cm−3 and T =6K, partial rates of the single spin-flip transition in ({p}3He+) are ∼ 1 · 10^6 s−1. Effective relaxation rates by considering the kinetics are approximately twice more. At the same conditions collisional shifts of the M1 spectral lines are ≤ 4 kHz, collisional broadening of the lines is  0.5 MHz. The total width of the line J−−+ → J+−+ at td = 350 ns is 2.4 MHz allowing for collisional and Fourier broadenings. Maximum MW resonance signal in 3He is about 0.5 of that one in 4He. [ DOI ]

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