Zero-Field Level Crossing in the Helium Atom
- 15 January 1972
- journal article
- Published by Canadian Science Publishing in Canadian Journal of Physics
- Vol. 50 (2) , 116-118
- https://doi.org/10.1139/p72-021
Abstract
Zero-field level-crossing techniques have been used to measure some upper-state lifetimes of the helium atom. The half-widths of curves obtained by plotting the polarization against the magnetic field strength for the n1D–21D transitions yielded lifetimes of 2.03 × 10−8 s for the 31D state, 3.36 × 10−8 s for the 41D state, and 7.44 × 10−8 s for the 51D state. Collision cross sections for these 1D levels were also determined.Keywords
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