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Physical Review A

Relative noble-gas-induced broadening of the D lines of atomic lithium

Ravinder Kachru, T. J. Chen, THOMAS W. MOSSBERG, Sven R. Hartmann

Published Mar 1, 1982• 8 citations
Publisher

Abstract

Photon echoes have been employed to measure the relative broadening rates of the lithium $D$ lines perturbed by the noble gases. We find that, for each noble-gas perturber, the ${D}_{1}$-line and ${D}_{2}$-line photon-echo-relaxation rates are identical. Our results are compared with those obtained in line-shape studies of pressure broadening.

DOI
10.1103/physreva.25.1546

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Photon echoes have been employed to measure the relative broadening rates of the lithium DDD lines perturbed by the noble gases. We find that, for each noble-gas perturber, the D1{D}_{1}D1​-line and D2{D}_{2}D2​-line photon-echo-relaxation rates are identical. Our results are compared with those obtained in line-shape studies of pressure broadening.
Noble-gas-induced relaxation of photon echo signals is used to determine the broadening rates of the Na D lines. Since echo signals are 'Doppler free', precision measurements are possible at low perturber-gas pressures (<or=1 Torr), and are sensitive to the previously inaccessible central lineshape. Interestingly, the authors results disagree with other recently published broadening rates. The equivalence of linewidth measurements and echo measurements on transitions between states of low electronic angular momentum is discussed.
Photon echoes generated from visible transitions in the noble gases helium, neon, and argon are observed and the collisional relaxation rates are measured. The photon echoes are excited on transitions initiating from metastable states which are populated by electron impact in an rf discharge. The photon-echo intensity is measured as a function of time after the discharge is turned off and as a function of gas pressure. The reduction of the echo intensity in these two experiments is attributed to relaxation of the metastable population in the afterglow and dephasing collisions, respectively. The dependence of the photon-echo damping time on transition wavelength and perturber gas is interpreted by means of a simple van der Waals model for the excited-atom and perturber-gas interaction.