Abbreviated Journal Title
Phys. Rev. Lett.
We report the first measurement of the angular distribution of the 304-Å He + ( n = 2 ) radiation following photoionization. This distribution reflects the alignment of the ion, which is related to the fraction ξ = σ ( 2 p , k d ) [ σ ( 2 p , k s ) + σ ( 2 p , k d ) ] of d component in the electron wave. The experimental angular distributions correspond to alignments of -0.62 ± 0.03 and -0.62 ± 0.02 at photon energies of 65.5 and 66.5 eV, respectively. These translate into ratios ξ = 0.25 ± 0.04 and 0.25 ± 0.03 , in good agreement with close-coupling calculations.
Physical Review Letters
Jiménez-Mier, J.; Caldwell, C. Denise; and Ederer, D. L., "Angular-Distribution Of Fluorescence From Photoionization-Produced He+ (N=2)" (1986). Faculty Bibliography 1980s. 504.