We show that in the Penning-ionizing collision He(23S1)+X→He(11S0)+(X+)*+e the precession of the Hem spin at its Larmor frequency forces the J polarization of the Penning ion to rotate at the same frequency but shifted in phase. The tangent of the phase shift is proportional to the lifetime of the ionic state and presents a unique method for measuring excited-ion lifetimes. © 1972 The American Physical Society.
W. F. Parks and L. D. Schearer, "Excited-ion Lifetimes Using Penning-ionizing Collisions," Physical Review Letters, vol. 29, no. 9, pp. 531 - 533, American Physical Society, Jan 1972.
The definitive version is available at https://doi.org/10.1103/PhysRevLett.29.531
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01 Jan 1972