ИСТИНА

We consider collisional effects on the transitions between HFS states of (¯p3He+) 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 (¯p4He+). 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 3x10^20/cm^3 and T=6 K, partial rates of the single spin-flip ransition in (¯p3He+) are \sim 1x10^6/s. 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 about 0.5 MHz. The total width of the line J--+\to 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.