Polarization of electron impact radiation from Zn and Cd atoms (n= 4 for Zn and 5 for Cd)

Abstract

Polarization of the (n + 1) 3 S → n 3 P J radiation from Zn and Cd atoms (n = 4 for Zn and 5 for Cd, respectively) was observed after electron impact with energy slightly above the n 1 S → (n + 1) 3 S threshold excitation energy. The observing direction was perpendicular to both the incident electron beam and the atomic beam. All of the triplet radiation (J = 0, 1 and 2) was slightly polarized. The observed fractional polarization degrees were −5.4, 3.8 and −0.8% corresponding to J = 0, 1 and 2 spectra in the final 3 P J states of the Zn atom and −6.9, 4.3 and −1.0% for the Cd atom. These values could be explained by assuming populations in the sublevels M S = 0 and ±1 of the (n + 1) 3 S states deviating from an equal mean value of 1 3 for each sublevel. It is interesting and reasonable that the deviations determined independently for different states coincided with each other quite well. The deviated values of fractional population for the sublevel M S = 0 were 0.36 for Zn and 0.37 for Cd, respectively.

Alignment of the (3d104s5s)3S1

“…Zn transitions considered here. Eminyan and Lampel [30] measured the integrated Stokes parameter P 3 /P e for the (4 3 P J -5 3 S 1 ) transitions using polarized electrons at energies between threshold (6.7 eV) and 10 eV, and Suzuki et al [31] measured for the same transitions using unpolarized electrons for a single energy. The Given the large amount of evidence that supports the BB symmetry argument, our results are not terribly surprising.…”

Polarization of electron impact radiation 73S rightarrow 63PJfrom a Hg atom

“…Therefore, the deviation of the p 0 value from the equal population of 1 3 for all the sublevels M s (−1, 0, +1) may be attributed to the cylindrical symmetry around the incident electron beam as described in the previous paper (Suzuki et al 1998). The ls coupling during the scattering may also be responsible (cf Kessler 1985).…”

“…Recently, we have reported on the polarization of electron impact radiation (n+1) 3 S 1 → n 3 P J from Zn and Cd atoms (n = 4 for Zn and 5 for Cd) (Suzuki et al 1998). All of the triplet radiation (J = 0, 1 and 2) of both the Zn and Cd atoms was slightly polarized.…”

“…In the present experiment the instrument used was the same as in the previous work (Suzuki et al 1998) except that the iron oven was used to produce Hg vapour with a Laval nozzle (Becker and Bier 1954). The experimental arrangement is shown in figure 1.…”

Polarized electron inner-shell ionization-with-excitation of zinc atoms

“…The 4s5s 3 S 1 state should not be aligned because it has zero orbital angular momentum. In contrast, later measurements (Suzuki et al 1998) showed non-zero linear polarization P 1 (i.e. alignment) for the emitted photons from the 4s5s 3 S 1 state after excitation by unpolarized electrons.…”