Polarization of Pb Vapor. III. Collisional Quenching and Depolarization of Alignment of Pb Metastable and Excited States

1 June 1972

journal article
research article
Published by American Physical Society (APS) in Physical Review A

Vol. 5 (6), 2408-2427
https://doi.org/10.1103/physreva.5.2408

Abstract

Several states of Pb were excited and studied in detail by simple optical techniques with data averaging. Cross sections for depolarization of alignment (in

Å^{2}

at 850°K, ±20%: He, 28; Ne, 46; Ar, 73; Xe, 105) and upper limits on quenching cross sections were determined for the

{}^{3}P_{1}^{o}

excited state of

{Pb}^{208}

by monitoring the reduction in the polarization of the fluorescence as a function of foreign-gas pressure. Optical-pumping Zeeman resonances were detected in optically produced and polarized

{}^{3}P_{1}

{}^{3}P_{2}

, and

{}^{1}D_{2}

metastable states and

g_{J}

ratios determined in

{Pb}^{208}

\frac{g_{J} ({}^{3}P_{1})}{g_{J} ({}^{3}P_{2})} = 1.17698 (15)

and

\frac{g_{J} ({}^{1}D_{2})}{g_{J} ({}^{3}P_{2})} = 0.96158 (33)

. The

g_{J} ({}^{1}D_{2})

due to Lurio and Landman implies

g_{J} ({}^{3}P_{2}) = 1.2753 (4)

and

g_{J} ({}^{3}P_{1}) = 1.5010 (5)

. From the dependence upon foreign-gas pressure of the optical-pumping recovery times after rf depolarization, the following cross sections for depolarization of alignment were deduced for the

{}^{3}P_{1}

and

Keywords

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