Physical Review A

Fine-structure effects on collisional broadening and shift of thallium two-photon lines

G. Mahr, G. Hermann

Published Oct 1, 1996• 1 citation

Abstract

Broadening and shift rates by rare gases have been measured for the Tl transitions 6${\mathit{P}}_{1/2}$-${\mathit{nP}}_{1/2,3/2}$ (n=9-14) applying Doppler-free two-photon spectroscopy. The rates show a clearly significant dependence on the total angular momentum of the upper nP states and also a distinct behavior over the most interesting range of intermediate effective principle quantum numbers. Calculations using a van der Waals potential and a combination of polarization and Fermi pseudopotential describe these dependences well. \textcopyright{} 1996 The American Physical Society.

DOI: 10.1103/physreva.54.2775

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Broadening the shift of the resonance line of thallium due to collisions with krypton and xenon atoms

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Broadening and shift of the resonance line of thallium due to collisions with neon and argon atoms

R S Dygdaa, Romuald Bobkowski, E. Lisicki

The width and shift of the resonance line of thallium ( lambda =377.68 nm) perturbed by neon and argon were investigated at low perturber densities using a pressure-scanned Fabry-Perot interferometer. The results are compared with those calculated on the basis of the van der Waals, Lennard-Jones and Czuchaj-Sienkiewicz potentials. Results obtained from this experiment are compared with data reported previously for this line and for other transitions in thallium.

Journal of Physics B Atomic Molecular and Optical PhysicsMay 28, 19896 citations

Physical Review A

Fine-structure effects on collisional broadening and shift of thallium two-photon lines

G. Mahr, G. Hermann

Published Oct 1, 1996• 1 citation

Publisher

Abstract

Broadening and shift rates by rare gases have been measured for the Tl transitions 6

{\mathit{P}}_{1/2}

{\mathit{nP}}_{1/2,3/2}

(n=9-14) applying Doppler-free two-photon spectroscopy. The rates show a clearly significant dependence on the total angular momentum of the upper nP states and also a distinct behavior over the most interesting range of intermediate effective principle quantum numbers. Calculations using a van der Waals potential and a combination of polarization and Fermi pseudopotential describe these dependences well. \textcopyright{} 1996 The American Physical Society.

DOI: 10.1103/physreva.54.2775

Related papers

Collisional broadening and shift of Doppler-free two-photon thallium lines perturbed by rare-gas atoms

Andrzej Bielski, R. Ciuryło, J. Domysławska +1 more

The European Physical Journal DJan 1, 19992 citations

Long-range interactions of the thallium 7 2S1/2 state and broadening and shift of the thallium violet and green lines by rare gases

Chao Wu, William C. Stwalley, Timothy R. Proctor

The Journal of Chemical PhysicsNov 1, 19786 citations

Broadening and shift of the sodium 3S-4D and 3S-5S two-photon lines perturbed by noble gases

F. Biraben, Bernard Cagnac, E. Giacobino +1 more

Journal of Physics B Atomic and Molecular PhysicsAug 21, 197745 citations

Shift and broadening of resolved hydrogen Balmer- α fine-structure lines in helium

E. W. Weber

Accurate values for the density shift and broadening of five isolated ${\mathrm{H}}_{\ensuremath{\alpha}}$ fine-structure transitions have been measured. Doppler-free polarization and double-quantum saturation spectroscopy with a cw dye laser are used in a He dc discharge with 1% ${\mathrm{H}}_{2}$ . The negative shifts and the huge broadening values are correctly predicted by an impact-approximation theory taking into account the large cross sections for fine-structure transfer (quenching) collisions and only Van der Waals interaction between ${\mathrm{H}}^{*}$ and He. Consequences of a comparison with the positive shift of the unresolved ${\mathrm{H}}_{\ensuremath{\alpha}}$ line and of the alkali-metal $D$ lines in He buffer gas are discussed. For pressures below 0.1 Torr hfs decoupling collisions give rise to a positive shift of single ${\mathrm{H}}_{\ensuremath{\alpha}}$ fine-structure lines and to a collisional narrowing effect analogous to that observed in nuclear magnetic resonance.Accurate values for the density shift and broadening of five isolated ${\mathrm{H}}_{\ensuremath{\alpha}}$ fine-structure transitions have been measured. Doppler-free polarization and double-quantum saturation spectroscopy with a cw dye laser are used in a He dc discharge with 1% ${\mathrm{H}}_{2}$. The negative shifts and the huge broadening values are correctly predicted by an impact-approximation theory taking into account the large cross sections for fine-structure transfer (quenching) collisions and only Van der Waals interaction between ${\mathrm{H}}^{*}$ and He. Consequences of a comparison with the positive shift of the unresolved ${\mathrm{H}}_{\ensuremath{\alpha}}$ line and of the alkali-metal $D$ lines in He buffer gas are discussed. For pressures below 0.1 Torr hfs decoupling collisions give rise to a positive shift of single ${\mathrm{H}}_{\ensuremath{\alpha}}$ fine-structure lines and to a collisional narrowing effect analogous to that observed in nuclear magnetic resonance.

Physical Review ADec 1, 197929 citations

Broadening the shift of the resonance line of thallium due to collisions with krypton and xenon atoms

R S Dygdaa

Reports the results of interferometric investigation of collisional broadening and shift of the resonance line of thallium ( lambda =377.68 nm) by krypton and xenon. The measurements were performed at low density of the perturbing gases (3-53*10 16 cm -3 ) and both Doppler and collisional broadening of the line were determined. The results are compared with those calculated on the basis of the van der Waals, Lennard-Jones and Czuchaj-Sienkiewicz potentials. The measured values of the broadening and shift by krypton and xenon are lower than those computed for the van der Waals and Lennard-Jones potentials. Calculations based on realistic potentials reported by Czuchaj and Sienkiewicz give values of the broadening coefficient in good agreement with the experimental data.Reports the results of interferometric investigation of collisional broadening and shift of the resonance line of thallium ( lambda =377.68 nm) by krypton and xenon. The measurements were performed at low density of the perturbing gases (3-53*10 16 cm -3 ) and both Doppler and collisional broadening of the line were determined. The results are compared with those calculated on the basis of the van der Waals, Lennard-Jones and Czuchaj-Sienkiewicz potentials. The measured values of the broadening and shift by krypton and xenon are lower than those computed for the van der Waals and Lennard-Jones potentials. Calculations based on realistic potentials reported by Czuchaj and Sienkiewicz give values of the broadening coefficient in good agreement with the experimental data.

Journal of Physics B Atomic Molecular and Optical PhysicsJun 14, 19887 citations

Broadening and shift of the resonance line of thallium due to collisions with neon and argon atoms

R S Dygdaa, Romuald Bobkowski, E. Lisicki

Journal of Physics B Atomic Molecular and Optical PhysicsMay 28, 19896 citations

Broadening and shift rates by rare gases have been measured for the Tl transitions 6

{\mathit{P}}_{1/2}

{\mathit{nP}}_{1/2,3/2}

{\mathrm{H}}_{2}

. The negative shifts and the huge broadening values are correctly predicted by an impact-approximation theory taking into account the large cross sections for fine-structure transfer (quenching) collisions and only Van der Waals interaction between

{\mathrm{H}}^{*}

and He. Consequences of a comparison with the positive shift of the unresolved ${\mathrm{H}}_{\ensuremath{\alpha}}$ line and of the alkali-metal

D

lines in He buffer gas are discussed. For pressures below 0.1 Torr hfs decoupling collisions give rise to a positive shift of single ${\mathrm{H}}_{\ensuremath{\alpha}}$ fine-structure lines and to a collisional narrowing effect analogous to that observed in nuclear magnetic resonance.