Measurement of intervals between1,3D and high-L states of He for n=7 to 10 by electric-field-induced anticrossings

Higher order electric-field-induced anticrossing signals have been used to measure a number of fine-structure intervals between n1,3D and nL states of the helium atom for 7<or=n<or=10 and 3<or=L<or=7. As far as other data are available previous experimental values for L=3 and 4 agree with the present results while theoretical values of the fine-structure intervals disagree by a few per cent. The n dependence of the measured intervals is discussed in terms of a A/n3+B/n5+... description. An empirical L dependence is derived.