Partial autoionization rates ofO4+(1s2s22p)3P0andP01: A crucial test of electron correlation in Be-like systems

For the first time, ratios of partial autoionization widths have been measured for highly ionized oxygen projectiles. In particular we have studied the Auger decay of the Be-like (1s2$s^2$2p${)}^3$ $P^0$ and ${}_{}{}^1{}_{}{}^{}\mathrm{P}_{}^0{}_{}{}^{}$ states in $0^{4+}$ decaying to the 1$s^2$2p and 1$s^2$2s final ionic states. Our experimental intensity ratios for the ${}_{}{}^3{}_{}{}^{}\mathrm{P}_{}^0{}_{}{}^{}$ and ${}_{}{}^1{}_{}{}^{}\mathrm{P}_{}^0{}_{}{}^{}$ states are 1.7 and 16, respectively. We also present new results on the partial and total autoionization widths of these states from calculations which include electron correlation and interchannel coupling via the application of the many-electron theory of ionic resonances in terms of complex coordinates.