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Journal of Physics B Atomic and Molecular Physics

Inelastic collisions between N2molecules and Hg atoms in the 63D1state

M. Barrat-Rambosson, Hélène Kucal

Published Jul 28, 1978• 2 citations
Publisher

Abstract

The cross sections for transfer of population from the Hg 6 3 D 1 level to the other levels of the 6s6d configuration, induced by collisions against N 2 molecules, are measured using, for the selective excitation of metastable 6 3 P 0 Hg atoms, a tunable dye laser with frequency doubling producing pulses of 2967 AA light. The following results are obtained: sigma ( 3 D 1 to 1 D 2 )=100+or-20 AA 2 , sigma ( 3 D 1 to 3 D 2 )=30+or-7 AA 2 , sigma ( 3 D 1 to 3 D 3 )=33+or-10 AA 2 , sigma ( 1 D 2 to q)=150+or-50 AA 2 , sigma ( 1 D 2 to q), being the cross section for population transfers from the 6 1 D 2 level to all Hg levels besides the 6 3 D 1 level.

DOI
10.1088/0022-3700/11/14/013

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Excitation transfer between 6s6d Hg fine-structure states, induced by collisions with Hg, Ar and N 2 , was studied using methods of fluorescence spectroscopy in a vapour cell. Hg vapour, pure or mixed with Ar or N 2 , was excited to the 6 1 D 2 or 6 3 D 2 state by two-photon absorption and the relative intensities of the fluorescence components emitted from the radiatively and collisionally populated states were determined using a monochromator and a photomultiplier. Measurements of the fluorescent intensity ratios in relation to the density of the collision partner yielded the total thermally averaged cross sections for the transfers 1 D 2 to 3 D 2 , 1 D 2 to 3 D 3 3 D 2 to 3 D 3 , and 3 D 2 to 1 D 2 , with Hg, Ar and N 2 as collision partners.
Collisional transfer of excitation from mercury to sodium was investigated using methods of sensitized fluorescence. A mixture of mercury and sodium vapors at low pressure was irradiated with Hg 2537 Å resonance radiation, producing a population of Hg(63P1) atoms whose inelastic collisions with ground-state sodium atoms resulted in a transfer of excitation energy to close-lying S, P, and D states in sodium. The subsequent decay of these states manifested itself in the emission of a sensitized fluorescent spectrum. Absolute intensity measurements on the components of the spectrum yielded 21 cross sections whose magnitudes range from 0.02 to 38.5 Å2 and which exhibit a pronounced resonance with ΔE, the energy defect between Hg (63P1) and the appropriate level in sodium.
Cross sections for 6^D, 7^D and 8^0 fine-structure mixing in Rb, induced in collisions with various ground-state atoms and N2 molecules, have been determined using methods of atomic fluorescence.Rb vapour, pure or mixed with a buffer gas, was irradiated in a glass fluorescence cell with pulses of radiation from a N2 laser-pumped dye laser, populating a fine-structure state by two-photon absorption.The resulting fluorescence included a direct component emitted in the decay of .the optically excited state and a sensitized component due to the col1isional1y populated fine-structure state.Measure ments of relative intensities of the two components in relation to buffer gas (or Rb vapour) pressure yielded the following cross sections.-14 2 Inelastic Cross sections (10 cm ) process Rb He Ne Ar Kr Xe I would like to express sincere thanks to Professor L.
The cross sections for the excitation energy transfer induced by collisions with He, Ar and Na ground-state atoms have been measured. The sodium atoms in the 4D state have been produced by two-photon excitation using cw laser radiation at 578.89 nm. Within a model which takes into account collisional population and depopulation of the 4F level as well as radiative relaxation (direct or cascade) of the 3D, 4P, 4D and 4F states ending in the 3P level, the rate for the collisional transfer turns out to be related to the ratio of the steady-state populations created in 3D and 4D states. They have been determined by measuring the fluorescence intensities of the and transitions. The measurements yield the following cross section values for those processes investigated: , and , at .
The cross sections for excitation transfer between the 62P fine structure levels of rubidium, induced in collisions with ground state rubidium atoms, have been measured using a nitrogen laser pumped dye laser as the optical excitation source in a fluorescence experiment. Rubidium vapor was irradiated with each component of the 2P rubidium doublet in turn, and measurements of the relative intensities of fluorescence yielded the following cross sections: [Formula: see text] These results are consistent with the empirical relationship between the magnitude of the cross sections and the fine structure splitting that has previously been established for the alkalis.