Lifetime quenching due to surface wake field

We report the measurement of surface wakefield on the lifetime of He-like Ti (1s2s 3S1) during the time-of-flight measurements in the beam-foil experiment. Quenching in the lifetime of 1s2s 3S1 state from 26.6 ns to 67.11 ps has been observed due to blending with short-lived 1s2p 3P1o states in the presence of wakefield present near the target surface. The measured and theoretical lifetime of unperturbed He-like Ti (1s2s 3S1) and (1s2p 3P1o) has been used to calculate the blending parameter ε (3.74 × 10−2). The surface wakefield for 110 MeV Ti+8 passing through 80 μg/cm2 thick carbon foil is found to be 9.15 × 107 V/cm. The measured stark mixing parameter can be used to determine the surface wakefield as well as the wake stopping power of an ion through a solid target.