Precision measurement of the crossing between the (J,M)=(0,0) and (1,1) sublevels and fine-structure splittings in 3 P3 helium

We have measured the position of the Zeeman level crossing between the (J,M)=(0,0) and (1,1) sublevels of the 3 3P state of helium. The result, 15.756 195(22) MHz (NMR frequency in water), is in good agreement with earlier, less precise measurements. This value, together with our previous measurement of the (2,2)-(0,0) level crossing, is used to calculate the zero-field fine-structure splitting. We find E02=8772.517(16) MHz between the J=0 and 2 states, E12=658.548(69) MHz between the J=1 and 2 states, and E01=8113.969(80) MHz between the J=1 and 0 states.