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Canadian Journal of Physics

Lifetimes and Oscillator Strengths in Singlet Levels of Strontium

F. M. Kelly, T. K. Koh, M. S. Mathur

Published May 1, 1974• 34 citations
Publisher

Abstract

Coherence narrowing and collision broadening of the 5s5p1P1 level of strontium have been studied. The natural lifetime of this level has been determined to be 4.68 ± 0.10 ns. The oscillator strength of the 4607 Å transition is 1.94 ± 0.06, and the f values of the transitions from the 5s6p, 5s7p, and 5s8p1P1 levels to the ground level and the 5s4d1D2 metastable level have been reevaluated. The cross section for Sr–Sr collisions is found to be [Formula: see text].

DOI
10.1139/p74-109

Related papers

Hanle Effect in Transitions from the 5s6p and 5s7p1P1 Levels of Strontium and Coherence Narrowing

F. M. Kelly, T. K. Koh, M. S. Mathur

The lifetimes of the 5s6p and 5s7p excited singlet P levels of strontium have been measured using the Hanle effect of the 2932 and 2574 Å transitions to the 5s21S0 level. These lifetimes are compared with those reported previously using the same technique in the 7169 and 5331 Å transitions to the metastable 5s4d1D2 level. The dependence of lifetime on the density of the scattering atoms in the coherence narrowing region has also been determined.

Canadian Journal of Physics•May 1, 1975•3 citations

Lifetimes, Oscillator Strengths, and Coherence Narrowing of the (6p8s)P103 and (6p7s)P101 States of Pb208

Ahmed Baghdadi, Joshua B. Halpern, E. B. Saloman

The lifetimes, oscillator strengths, and coherence narrowing of the $(6p8s)^{3}P_{1}^{0}$ and $(6p7s)^{1}P_{1}^{0}$ states of ${\mathrm{Pb}}^{208}$ were measured in this work by zero-field level-crossing spectroscopy. For the $(6p8s)^{3}P_{1}^{0}$ state the lifetime $\ensuremath{\tau}=1.26(5)\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}8}$ sec and the absorption oscillator strength for the 2053-\AA{} transition to the ground state was 0.041(8). For the $(6p7s)^{1}P_{1}^{0}$ state, $\ensuremath{\tau}=4.8(3)\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}9}$ sec, and the absorption oscillator strength for the 2022-\AA{} transition to the ground state was 0.020(12).

Physical Review A•Feb 1, 1973•4 citations

Lifetimes of levels in neutral strontium (Sr i)*

H. J. Andrä, H. -J. Plöhn, W. Wittmann +3 more

We have measured mean lives of five levels in three different configurations in Sr i by exciting them selectively in fast beams of neutralized ions by light from an argon-ion laser, and following their time-resolved decay downstream. The mean lives of these levels are 5s5d3D3, 16.29 ± 0.24 ns; 5s5d3D2, 16.34 ± 0.13 ns; 5s5d3D1, 16.49 ± 0.10 ns; 5p2 3P2, 7.89 ± 0.05 ns; and 5s4f F13°, 34.2 ± 0.4 ns.

Journal of the Optical Society of America•Dec 1, 1975•26 citations

Oscillator Strengths of Ca II, Sr II, and Ba II

Alan C. Gallagher

The lifetimes of the $5p^{2}P_{\frac{3}{2}}$ and $5p^{2}P_{\frac{1}{2}}$ states of ${\mathrm{Sr}}^{+}$ and the $6p^{2}P_{\frac{3}{2}}$ and $6p^{2}P_{\frac{1}{2}}$ states of ${\mathrm{Ba}}^{+}$ have been measured by the Hanle-effect technique with optical excitation from the ion ground state. (The lifetimes of the ${\mathrm{Mg}}^{+}$ $3p^{2}P_{\frac{3}{2}}$ and ${\mathrm{Ca}}^{+}$ $4p^{2}P_{\frac{3}{2}}$ states were obtained by the same technique and reported previously.) These ${\mathrm{Ca}}^{+}$, ${\mathrm{Sr}}^{+}$, and ${\mathrm{Ba}}^{+}$ states each decay to a $^{2}D_{\frac{3}{2},\frac{5}{2}}$ doublet as well as to the ground $^{2}S_{\frac{1}{2}}$ state, and the branching ratios for these transitions have been measured. The ions were produced by introducing traces of the atomic vapor into an argon discharge. Consequently, the cross sections for collisional depolarization of these $^{2}P_{J}$ states due to collisions with argon were also obtained from the measurements. The experimental results are given in Tables I and II. A discussion of the ion-atom collisional depolarization cross sections is included.

Physical Review•May 5, 1967•217 citations

Oscillator strength measurements of the 5s6s S10→5snp P11 Rydberg transitions of strontium

Sami Ul Haq, Mazhar Ali Kalyar, M. Rafiq +3 more

We report the experimentally determined oscillator strengths for the $5s6s$ ${^{1}S}_{0}\ensuremath{\rightarrow}5snp$ ${^{1}P}_{1}$ Rydberg transitions of strontium using two-step excitation in conjunction with a thermionic diode ion detector. The absolute photoionization cross section from the $5s6s$ ${^{1}S}_{0}$ excited state has been determined by adjusting the polarization vector of the ionizing laser beam parallel, perpendicular, and at the magic angle with respect to that of the exciting dye laser. The measured absolute value of the photoionization cross section $0.9\ifmmode\pm\else\textpm\fi{}0.2\text{ }\text{Mb}$ at the $5s$ threshold is used to extract the $f$ values of the $5s6s$ ${^{1}S}_{0}\ensuremath{\rightarrow}5snp$ ${^{1}P}_{1}$ $(26\ensuremath{\le}n\ensuremath{\le}73)$ Rydberg transitions. The oscillator strength in the discrete region merges smoothly to the oscillator strength density at the ionization threshold.

Physical Review A•Apr 3, 2009•11 citations

Level-Crossing Spectroscopy in 7S2 Thallium. I. Studies of Coherence-Narrowing, Collision-Broadening, and Buffer-Gas Effects

Jin-Yuan Hsieh, James C. Baird

The lifetime, coherence narrowing, and collision broadening of the $7^{2}S_{\frac{1}{2}}$ excited state of atomic thallium has been studied by the technique of zero-field level-crossing spectroscopy. The lifetime of the $7^{2}S_{\frac{1}{2}}$ state is determined to be 7.55 (0.08) nsec. The full coherence-narrowing effect gave a branching ratio, from $F=0$ of $7^{2}S_{\frac{1}{2}}$ to the ground state, of 43%. The cross section for thallium-thallium resonance-broadening collisions is ${\ensuremath{\sigma}}_{\mathrm{T}\mathrm{l}\ensuremath{-}\mathrm{T}\mathrm{l}}=\frac{5.38(0.49)\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}8}}{\overline{v}}$ ${\mathrm{cm}}^{2}$. The effect of 426-torr helium on the thallium lifetime, coherence narrowing, and resonance broadening was also investigated. From the low-thallium-density region the cross section for helium depolarization of the thallium $7^{2}S$ state is ${\ensuremath{\sigma}}_{\mathrm{T}\mathrm{l}\ensuremath{-}\mathrm{H}\mathrm{e}}\ensuremath{\cong}\frac{7\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}13}}{\overline{v}}$ ${\mathrm{cm}}^{2}$. There is also indication of a buildup of population in the metastable $6^{2}P_{\frac{3}{2}}$ thallium state. From the data, the cross section for the process $\mathrm{Tl}(6^{2}P_{\frac{3}{2}})\ensuremath{\rightarrow}\mathrm{Tl}(6^{2}P_{\frac{1}{2}})$ by helium collisions is $\ensuremath{\sigma}\ensuremath{\simeq}1\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}21}$ ${\mathrm{cm}}^{2}$. The Tl branching ratio in the presence of helium is 39%. It was also found that the thallium-thallium resonance-broadening cross section is ${\ensuremath{\sigma}}_{\mathrm{T}\mathrm{l}\ensuremath{-}\mathrm{T}\mathrm{l}}=\frac{4.04(0.32)\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}8}}{\overline{v}}$ ${\mathrm{cm}}^{2}$ in the presence of 426 torr of helium. In the presence of 113 torr of He, the resonance-broadening cross section was found to be ${\ensuremath{\sigma}}_{\mathrm{T}\mathrm{l}\ensuremath{-}\mathrm{T}\mathrm{l}}=\frac{5.22(0.13)\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}8}}{\overline{v}}$ ${\mathrm{cm}}^{2}$. In the case of Ar as the buffer gas, ${\ensuremath{\sigma}}_{\mathrm{T}\mathrm{l}\ensuremath{-}\mathrm{A}\mathrm{r}}=\frac{8\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}13}}{\overline{v}}$ ${\mathrm{cm}}^{2}$.

Physical Review A•Jul 1, 1972•28 citations
Coherence narrowing and collision broadening of the 5s5p1P1 level of strontium have been studied. The natural lifetime of this level has been determined to be 4.68 ± 0.10 ns. The oscillator strength of the 4607 Å transition is 1.94 ± 0.06, and the f values of the transitions from the 5s6p, 5s7p, and 5s8p1P1 levels to the ground level and the 5s4d1D2 metastable level have been reevaluated. The cross section for Sr–Sr collisions is found to be [Formula: see text].
The lifetimes, oscillator strengths, and coherence narrowing of the (6p8s)3P10(6p8s)^{3}P_{1}^{0}(6p8s)3P10​ and (6p7s)1P10(6p7s)^{1}P_{1}^{0}(6p7s)1P10​ states of Pb208{\mathrm{Pb}}^{208}Pb208 were measured in this work by zero-field level-crossing spectroscopy. For the (6p8s)3P10(6p8s)^{3}P_{1}^{0}(6p8s)3P10​ state the lifetime $\ensuremath{\tau}=1.26(5)\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}8}$ sec and the absorption oscillator strength for the 2053-\AA{} transition to the ground state was 0.041(8). For the (6p7s)1P10(6p7s)^{1}P_{1}^{0}(6p7s)1P10​ state, $\ensuremath{\tau}=4.8(3)\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}9}$ sec, and the absorption oscillator strength for the 2022-\AA{} transition to the ground state was 0.020(12).
The lifetimes of the 5p2P325p^{2}P_{\frac{3}{2}}5p2P23​​ and 5p2P125p^{2}P_{\frac{1}{2}}5p2P21​​ states of Sr+{\mathrm{Sr}}^{+}Sr+ and the 6p2P326p^{2}P_{\frac{3}{2}}6p2P23​​ and 6p2P126p^{2}P_{\frac{1}{2}}6p2P21​​ states of Ba+{\mathrm{Ba}}^{+}Ba+ have been measured by the Hanle-effect technique with optical excitation from the ion ground state. (The lifetimes of the Mg+{\mathrm{Mg}}^{+}Mg+ 3p2P323p^{2}P_{\frac{3}{2}}3p2P23​​ and Ca+{\mathrm{Ca}}^{+}Ca+ 4p2P324p^{2}P_{\frac{3}{2}}4p2P23​​ states were obtained by the same technique and reported previously.) These Ca+{\mathrm{Ca}}^{+}Ca+, Sr+{\mathrm{Sr}}^{+}Sr+, and Ba+{\mathrm{Ba}}^{+}Ba+ states each decay to a 2D32,52^{2}D_{\frac{3}{2},\frac{5}{2}}2D23​,25​​ doublet as well as to the ground 2S12^{2}S_{\frac{1}{2}}2S21​​ state, and the branching ratios for these transitions have been measured. The ions were produced by introducing traces of the atomic vapor into an argon discharge. Consequently, the cross sections for collisional depolarization of these 2PJ^{2}P_{J}2PJ​ states due to collisions with argon were also obtained from the measurements. The experimental results are given in Tables I and II. A discussion of the ion-atom collisional depolarization cross sections is included.
We report the experimentally determined oscillator strengths for the 5s6s5s6s5s6s ${^{1}S}_{0}\ensuremath{\rightarrow}5snp$ 1P1{^{1}P}_{1}1P1​ Rydberg transitions of strontium using two-step excitation in conjunction with a thermionic diode ion detector. The absolute photoionization cross section from the 5s6s5s6s5s6s 1S0{^{1}S}_{0}1S0​ excited state has been determined by adjusting the polarization vector of the ionizing laser beam parallel, perpendicular, and at the magic angle with respect to that of the exciting dye laser. The measured absolute value of the photoionization cross section $0.9\ifmmode\pm\else\textpm\fi{}0.2\text{ }\text{Mb}$ at the 5s5s5s threshold is used to extract the fff values of the 5s6s5s6s5s6s ${^{1}S}_{0}\ensuremath{\rightarrow}5snp$ 1P1{^{1}P}_{1}1P1​ $(26\ensuremath{\le}n\ensuremath{\le}73)$ Rydberg transitions. The oscillator strength in the discrete region merges smoothly to the oscillator strength density at the ionization threshold.
The lifetime, coherence narrowing, and collision broadening of the 72S127^{2}S_{\frac{1}{2}}72S21​​ excited state of atomic thallium has been studied by the technique of zero-field level-crossing spectroscopy. The lifetime of the 72S127^{2}S_{\frac{1}{2}}72S21​​ state is determined to be 7.55 (0.08) nsec. The full coherence-narrowing effect gave a branching ratio, from F=0F=0F=0 of 72S127^{2}S_{\frac{1}{2}}72S21​​ to the ground state, of 43%. The cross section for thallium-thallium resonance-broadening collisions is ${\ensuremath{\sigma}}_{\mathrm{T}\mathrm{l}\ensuremath{-}\mathrm{T}\mathrm{l}}=\frac{5.38(0.49)\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}8}}{\overline{v}}$ cm2{\mathrm{cm}}^{2}cm2. The effect of 426-torr helium on the thallium lifetime, coherence narrowing, and resonance broadening was also investigated. From the low-thallium-density region the cross section for helium depolarization of the thallium 72S7^{2}S72S state is ${\ensuremath{\sigma}}_{\mathrm{T}\mathrm{l}\ensuremath{-}\mathrm{H}\mathrm{e}}\ensuremath{\cong}\frac{7\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}13}}{\overline{v}}$ cm2{\mathrm{cm}}^{2}cm2. There is also indication of a buildup of population in the metastable 62P326^{2}P_{\frac{3}{2}}62P23​​ thallium state. From the data, the cross section for the process $\mathrm{Tl}(6^{2}P_{\frac{3}{2}})\ensuremath{\rightarrow}\mathrm{Tl}(6^{2}P_{\frac{1}{2}})$ by helium collisions is $\ensuremath{\sigma}\ensuremath{\simeq}1\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}21}$ cm2{\mathrm{cm}}^{2}cm2. The Tl branching ratio in the presence of helium is 39%. It was also found that the thallium-thallium resonance-broadening cross section is ${\ensuremath{\sigma}}_{\mathrm{T}\mathrm{l}\ensuremath{-}\mathrm{T}\mathrm{l}}=\frac{4.04(0.32)\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}8}}{\overline{v}}$ cm2{\mathrm{cm}}^{2}cm2 in the presence of 426 torr of helium. In the presence of 113 torr of He, the resonance-broadening cross section was found to be ${\ensuremath{\sigma}}_{\mathrm{T}\mathrm{l}\ensuremath{-}\mathrm{T}\mathrm{l}}=\frac{5.22(0.13)\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}8}}{\overline{v}}$ cm2{\mathrm{cm}}^{2}cm2. In the case of Ar as the buffer gas, ${\ensuremath{\sigma}}_{\mathrm{T}\mathrm{l}\ensuremath{-}\mathrm{A}\mathrm{r}}=\frac{8\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}13}}{\overline{v}}$ cm2{\mathrm{cm}}^{2}cm2.