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Life Time Measurements of High Lying Hg States by Resonant Two-Photon Excitation

Dieter Gruber, Kiril B. Blagoev, Ursula Domiaty, Laurentius Windholz, А. N. Morozov

Published Jan 1, 1996• 0 citations
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Half value time for the ${2}^{3}$${\mathrm{P}}_{0}$ state of Hg for various pressures of admixed ${\mathrm{N}}_{2}$--- A high speed rotating disk has been used to interrupt the total radiation from a water-cooled and magnetically controlled quartz mercury arc before optically exciting mercury vapor in a quartz resonance tube at room temperature. In the neighborhood of ${10}^{\ensuremath{-}4}$ sec. after the optical excitation a flash of visible radiation from another water-cooled and magnetically controlled mercury arc was passed through the resonance tube and the absorption spectrum photographed. The line 4047 ($2^{3}P_{0}\ensuremath{-}2^{3}S_{1}$) showed strong absorption when a few millimeters of nitrogen were introduced into the resonance tube. The lines 4077, 4358, 5461, 5770 and 5790 showed no measurable absorption under similar conditions. The rate of decay of the amount of 4047 absorbed with respect to the time-wait after excitation of the mercury vapor was taken as the rate of decay of the metastable $2^{3}P_{0}$ state. The life or half-value time of the state was found to vary markedly with the pressure of admixed nitrogen. The maximum life 4.2\ifmmode\times\else\texttimes\fi{}${10}^{\ensuremath{-}4}$ sec. occurred for 6.8 mm of nitrogen. No absorption of 4047 was observed upon the introduction of hydrogen, argon, neon, or helium into the resonance tube.

Physical Review•Jan 1, 1929•14 citations

Induced two-photon decay of the 63 P 0 state of Hg

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Sensitized Fluorescence in Sodium Induced in Collisions with Hg(63P1) Atoms

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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.

Canadian Journal of Physics•Feb 1, 1973•12 citations

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Springer series in optical sciences/SPringer series in optical sciences•Jan 1, 1987•2 citations

Energy transfer in mercury vapour following laser excitation of the 71S0state by two-photon absorption

N. Bras, J. C. Jeannet, D. Perrin

After excitation of the 7 1 S 0 mercury state by two photon absorption of a laser radiation at 313 nm the time integrated intensities of the 407.8 (I 0 ) and 404.7 nm (I 1 ) lines emitted from the 7 1 S 0 and 7 3 S 1 states were determined as functions of the pump laser intensity, I, and mercury pressure. At high pump laser intensities I 0 and I 1 do not follow anymore a quadratic law in I, I 0 weakens to I n<2 while, in contrast, I 1 increases to I n>2 . The time evolutions of the populations of these 7 1 S 0 , 7 3 S 1 states and of the 6 1 P 1 , 6 3 P 0,1,2 states were determined. The set of experimental results is well reproduced by introducing collisions of two Hg(6P) atoms as well as two Hg(7 1 S 0 ) collisions. Effects of these collisions are discussed.

Journal of Physics B Atomic Molecular and Optical Physics•Aug 14, 1993•6 citations
Half value time for the 23{2}^{3}23P0{\mathrm{P}}_{0}P0​ state of Hg for various pressures of admixed N2{\mathrm{N}}_{2}N2​--- A high speed rotating disk has been used to interrupt the total radiation from a water-cooled and magnetically controlled quartz mercury arc before optically exciting mercury vapor in a quartz resonance tube at room temperature. In the neighborhood of ${10}^{\ensuremath{-}4}$ sec. after the optical excitation a flash of visible radiation from another water-cooled and magnetically controlled mercury arc was passed through the resonance tube and the absorption spectrum photographed. The line 4047 ($2^{3}P_{0}\ensuremath{-}2^{3}S_{1}$) showed strong absorption when a few millimeters of nitrogen were introduced into the resonance tube. The lines 4077, 4358, 5461, 5770 and 5790 showed no measurable absorption under similar conditions. The rate of decay of the amount of 4047 absorbed with respect to the time-wait after excitation of the mercury vapor was taken as the rate of decay of the metastable 23P02^{3}P_{0}23P0​ state. The life or half-value time of the state was found to vary markedly with the pressure of admixed nitrogen. The maximum life 4.2\ifmmode\times\else\texttimes\fi{}${10}^{\ensuremath{-}4}$ sec. occurred for 6.8 mm of nitrogen. No absorption of 4047 was observed upon the introduction of hydrogen, argon, neon, or helium into the resonance tube.
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.
After excitation of the 7 1 S 0 mercury state by two photon absorption of a laser radiation at 313 nm the time integrated intensities of the 407.8 (I 0 ) and 404.7 nm (I 1 ) lines emitted from the 7 1 S 0 and 7 3 S 1 states were determined as functions of the pump laser intensity, I, and mercury pressure. At high pump laser intensities I 0 and I 1 do not follow anymore a quadratic law in I, I 0 weakens to I n<2 while, in contrast, I 1 increases to I n>2 . The time evolutions of the populations of these 7 1 S 0 , 7 3 S 1 states and of the 6 1 P 1 , 6 3 P 0,1,2 states were determined. The set of experimental results is well reproduced by introducing collisions of two Hg(6P) atoms as well as two Hg(7 1 S 0 ) collisions. Effects of these collisions are discussed.