Collisional transitions between HFS statesof antiprotonic 3He in the presenceof microwave radiationстатья
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Дата последнего поиска статьи во внешних источниках: 4 февраля 2014 г.
Аннотация:We consider collisional effects on the transitions between HFS states
of (\bar{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 (\bar{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 (\bar{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.