QUENCHING OF CESIUM RESONANCE RADIATION BY HELIUM

Using the phase shift technique to measure excited state lifetimes, upper limits of 1.5 à 10â14 cm3/sec and 3 à 10â14 cm3/sec have been established for the Cs(62P1/2re3/2) + He â Cs(62S1/2) + He quenching rate constants at 350° and 820°K. (In “cross section” units these are equivalent to 10â19 cm2 upper limits.) The natural lifetimes were measured to be 30.8 ± 1.5 à 10â9 sec and 35.2 ± 1.5 à 10â9 sec for the Cs 62P3/2 and 62P1/2 states. © 1969, American Institute of Physics. All rights reserved.