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Journal of the Physical Society of Japan

Lifetimes and Cross-Sections of Laser Levels of Xenon Measured by Hanle Effect

Takanori Suzuki, Kōichi Shimoda

Published Jul 15, 1977• 11 citations

Abstract

Hanle effect studies using circularly polarized laser beam and linearly polarized laser beam were carried out. Lifetimes, orientation and alignment destruction cross sections were measured for the 5 d 33 , 6 p 22 and 6 p 01 excited levels of xenon. The observed ratio of orientational cross section to alignment cross section for Xe–Xe scattering was 1.1±0.4 for the 5 d 33 level, and 0.55±0.2 for the 6 p 22 level. The ratio for Xe–He scattering was 0.8±0.2 for the 5 d 33 level and 0.6±0.2 for the 6 p 22 level. They are compared with those calculated by Wang and Tomlinson. The observed radiative lifetime was 520±30 ns for the 5 d 33 level, 35±2 ns for the 6 p 22 level and 37±4 ns for the 6 p 01 level. The decay rate of the 5 d 33 level observed in the coherence transfer with spontaneous emission is consistent with the width of the Mania signal.

DOI: 10.1143/jpsj.43.233

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Physical Review A•Feb 1, 1990•7 citations

Hanle effect studies using circularly polarized laser beam and linearly polarized laser beam were carried out. Lifetimes, orientation and alignment destruction cross sections were measured for the 5 d 33 , 6 p 22 and 6 p 01 excited levels of xenon. The observed ratio of orientational cross section to alignment cross section for Xe–Xe scattering was 1.1±0.4 for the 5 d 33 level, and 0.55±0.2 for the 6 p 22 level. The ratio for Xe–He scattering was 0.8±0.2 for the 5 d 33 level and 0.6±0.2 for the 6 p 22 level. They are compared with those calculated by Wang and Tomlinson. The observed radiative lifetime was 520±30 ns for the 5 d 33 level, 35±2 ns for the 6 p 22 level and 37±4 ns for the 6 p 01 level. The decay rate of the 5 d 33 level observed in the coherence transfer with spontaneous emission is consistent with the width of the Mania signal.

The radiative lifetimes of the 17992-,25068-,28857-, 37414-, 40564-, and 44017-${\mathrm{cm}}^{\ensuremath{-}1}$ neutral levels and the 30392-${\mathrm{cm}}^{\ensuremath{-}1}$ ion level of Yb have been measured by the Hanle method in a fast-flowing He system. The lifetimes (in units of ${10}^{\ensuremath{-}9}$ sec) were found to be 820(20), 5.12(0.12), 14.4(0.4), 77.4(6.0), 9.32(0.6), 39.1(3.5), and 5.8(0.6), respectively. In a flowing system with He as a buffer gas the alignment depolarization cross sections with Yb were obtained and are reported here for the first time. They are (in units of ${10}^{\ensuremath{-}15}$

{\mathrm{cm}}^{2}

) 5.0(1.0), 5.9(1.0), 5.9(1.2), 17.9(2.0), 28.2(3.0), 5.16(4.0), and 7.2(2.5), respectively.

A signal due to the crossing of levels in zero magnetic field was observed in the λ=361 nm (53D3–53P2 transition) spontaneous radiation from the lower laser level of a Cd I pulse laser. The level-crossing signal had a profile close to the difference between two Lorentzian profiles, one of which was due to the decay of the upper laser level and the other to the decay of the lower laser level. The lifetimes of these levels and the cross sections of the depolarizing collisions with neon were determined.

We have measured the atomic lifetime of the argon 2 p 4 level by the laser-induced-fluorescence spectroscopy to be 30.5 ns. This contradicts the recent measurement using the high-frequency plused electron-beam excitation. We conjecture that, in their experiment, the radiation trapping not only affects the decay of the upper-level population but also relaxes the alignment initially produced by the electron-collision excitation in the upper-level population. Thus, the directly observed decay of the emission-line intensity is different from the decay of the upper-level population. We have observed the radiative relaxation of alignment on the neon 2 p 2 level which is a complementary effect to coherence narrowing.

Collisional relaxation of the 6s

{\mathrm{cm}}^{2}

and 6s'

{[1/2]}_{1}^{0}

{m}_{J}

levels of Xe has been investigated both experimentally and theoretically. Collisional disalignment and dephasing of the

{m}_{J}

levels have been studied by measuring the pressure and laser intensity dependence of the ratio of the ionization from selectively excited

{m}_{J}

=0 and \ifmmode\pm\else\textpm\fi{}1 sublevels in a three-photon resonant-ionization experiment via the 6s and 6s' states of Xe. The selective ionization is achieved by a novel use of two counterpropagating laser beams having parallel and orthogonal polarization, respectively. The pressure dependence of the ionization ratio has been calculated by solving a system of rate equations derived from a full set of density-matrix equations pertaining to the particular experimental conditions. Collisional-relaxation cross sections of the investigated levels have been estimated by fitting the calculated results to the experimental data. The ionization ratio is found to be sensitive to both disalignment and dephasing of the

{m}_{J}

levels.