The European Physical Journal D

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

Andrzej Bielski, R. Ciuryło, J. Domysławska, R. S. Trawiński

Published Jan 1, 1999• 2 citations

Abstract

The extended Omont-Ueda-Kaulakys treatment of collisional effects on quasi-Rydberg states, in which the perturbation of the lower state is taken into account is applied to thallium-rare gas systems. The pressure broadening and shift coefficients of two-photon transitions in thallium involving the 6P 1/2 -n P 1/2,3/2 (n = 9-14) states are calculated and compared with experimental data obtained by Hermann et al. [Eur. Phys. J. D 1, 129 (1998)].

DOI: 10.1007/pl00021601

Related papers

Collisional broadening of Rydberg atom transitions by rare gas perturbers

Megan E Henry, Roger M. Herman

Journal of Physics B Atomic Molecular and Optical PhysicsJan 10, 20027 citations

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

G. Mahr, G. Hermann

Physical Review AOct 1, 19961 citation

Calculated pressure broadening and shift for the sodium atom perturbed by rare gases. II. Two-photon 3S−nS transitions ( n=6−9 )

Chao Wu, William C. Stwalley

Physical Review AAug 1, 19817 citations

Calculated pressure broadening and shift for alkali-metal atoms perturbed by rare gases: Two-photon S−S transitions

Chao Wu, William C. Stwalley

Physical Review ASep 1, 197816 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

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

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 long-range interaction coefficients (C6, C8, C10) of the Tl(7 S1/2) atom with rare gases are calculated. The pressure-induced broadening and shift of the thallium resonance lines in the presence of rare gases are then calculated using these long-range coefficients and impact theory. We find that higher order van der Waals forces are not negligible compared to the leading −C6/R6 dispersion force in terms of their contributions to the broadening and shift.

The Journal of Chemical PhysicsNov 1, 19786 citations

The European Physical Journal D

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

Andrzej Bielski, R. Ciuryło, J. Domysławska, R. S. Trawiński

Published Jan 1, 1999• 2 citations

Publisher

Abstract

DOI: 10.1007/pl00021601

Related papers

Collisional broadening of Rydberg atom transitions by rare gas perturbers

Megan E Henry, Roger M. Herman

In this paper we present the results and discuss the applicability of an impact theory of lineshapes, developed by Henry and Herman for the pressure-induced broadening and shifting of transitions from the ground state to various Rydberg states of alkalis, to the situation in which the perturbing atoms are ground-state rare gas atoms. This theory, which has successfully described the collisional broadening of Rydberg states by alkali atoms, can without major alterations predict the widths and shifts of Doppler-free two-photon transitions to n S and n D states of Rb and Na, 6⩽ n ⩽30, perturbed by He, Ne, Ar, Kr and Xe. The results in all cases show reasonable agreement with experiment, with the transitions to Na**( n D) states being somewhat less satisfactory than the others.In this paper we present the results and discuss the applicability of an impact theory of lineshapes, developed by Henry and Herman for the pressure-induced broadening and shifting of transitions from the ground state to various Rydberg states of alkalis, to the situation in which the perturbing atoms are ground-state rare gas atoms. This theory, which has successfully described the collisional broadening of Rydberg states by alkali atoms, can without major alterations predict the widths and shifts of Doppler-free two-photon transitions to n S and n D states of Rb and Na, 6⩽ n ⩽30, perturbed by He, Ne, Ar, Kr and Xe. The results in all cases show reasonable agreement with experiment, with the transitions to Na**( n D) states being somewhat less satisfactory than the others.

Journal of Physics B Atomic Molecular and Optical PhysicsJan 10, 20027 citations

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

G. Mahr, G. Hermann

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.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.

Physical Review AOct 1, 19961 citation

Calculated pressure broadening and shift for the sodium atom perturbed by rare gases. II. Two-photon 3S−nS transitions ( n=6−9 )

Chao Wu, William C. Stwalley

Our recent treatment [Phys. Rev. A 18, 1066 (1978)] of the broadening and shift of alkali-metal-atom two-photon $S\ensuremath{-}S$ transitions is applied to the Na $3S\ensuremath{-}\mathrm{nS}$ transitions ($n=6\ensuremath{-}9$) perturbed by Ar, Kr, and Xe rare gases. Comparison with recent experimental data [A. Flusberg et al., Phys. Rev. A 19, 1607 (1979)] on the Na-Ar pair for $n\ensuremath{\le}7$ shows good agreement. However, for transitions to $n>8$ the calculated pressure effects no longer agree well with experimental data; presumably the pressure effects cannot be adequately described by a simple two-body long-range impact theory.Our recent treatment [Phys. Rev. A 18, 1066 (1978)] of the broadening and shift of alkali-metal-atom two-photon $S\ensuremath{-}S$ transitions is applied to the Na $3S\ensuremath{-}\mathrm{nS}$ transitions ($n=6\ensuremath{-}9$) perturbed by Ar, Kr, and Xe rare gases. Comparison with recent experimental data [A. Flusberg et al., Phys. Rev. A 19, 1607 (1979)] on the Na-Ar pair for $n\ensuremath{\le}7$ shows good agreement. However, for transitions to $n>8$ the calculated pressure effects no longer agree well with experimental data; presumably the pressure effects cannot be adequately described by a simple two-body long-range impact theory.

Physical Review AAug 1, 19817 citations

Calculated pressure broadening and shift for alkali-metal atoms perturbed by rare gases: Two-photon S−S transitions

Chao Wu, William C. Stwalley

The broadening and shift of two-photon $S\ensuremath{-}S$ transitions (e.g., in alkali-metal atoms perturbed by rare gases) are shown to be readily calculable. These calculations employ (a) newly available expressions for alkalimetal-rare-gas long-range potential coefficients ${C}_{6}$ , ${C}_{8}$ , and ${C}_{10}$ ; and (b) the (herein discussed) appropriate form of impact theory (particularly simple since only a single potential curve is involved and inelastic processes are not usually important). It is demonstrated in particular that the influence of ${C}_{8}$ and ${C}_{10}$ terms on the broadening and shift is significant though not dominant. Comparison with recent experimental data on the Na-rare-gas pairs shows reasonable agreement for the heavy rare gases.The broadening and shift of two-photon $S\ensuremath{-}S$ transitions (e.g., in alkali-metal atoms perturbed by rare gases) are shown to be readily calculable. These calculations employ (a) newly available expressions for alkalimetal-rare-gas long-range potential coefficients ${C}_{6}$, ${C}_{8}$, and ${C}_{10}$; and (b) the (herein discussed) appropriate form of impact theory (particularly simple since only a single potential curve is involved and inelastic processes are not usually important). It is demonstrated in particular that the influence of ${C}_{8}$ and ${C}_{10}$ terms on the broadening and shift is significant though not dominant. Comparison with recent experimental data on the Na-rare-gas pairs shows reasonable agreement for the heavy rare gases.

Physical Review ASep 1, 197816 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

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 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.

n>8

the calculated pressure effects no longer agree well with experimental data; presumably the pressure effects cannot be adequately described by a simple two-body long-range impact theory.

{C}_{6}

{C}_{8}

, and

{C}_{10}

; and (b) the (herein discussed) appropriate form of impact theory (particularly simple since only a single potential curve is involved and inelastic processes are not usually important). It is demonstrated in particular that the influence of

{C}_{8}

and

{C}_{10}

terms on the broadening and shift is significant though not dominant. Comparison with recent experimental data on the Na-rare-gas pairs shows reasonable agreement for the heavy rare gases.