Zeitschrift für Naturforschung A

Resonanzstreuung von Licht an freien Ba+-Ionen

Hans Bucka, Jan-Christoph Eichler, Gebhard von Oppen

Published May 1, 1966• 14 citations

Abstract

Resonance scattering on Ba+-ions of the 4554 Å-line (6 2P3/2—6 2S1/2) of the Ba II-spectrum was observed at various magnetic fields. Measuring the change of polarisation degree (HANLE effect) the lifetime of the 6 2P3/2-term was deduced to be (0.70 ± 0.06) × 10-8 sec.

DOI: 10.1515/zna-1966-0524

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Zeitschrift für Naturforschung A

Resonanzstreuung von Licht an freien Ba+-Ionen

Hans Bucka, Jan-Christoph Eichler, Gebhard von Oppen

Published May 1, 1966• 14 citations

Publisher

Abstract

DOI: 10.1515/zna-1966-0524

Related papers

Untersuchung des 5p2P3/2-Terms im Silber I-Spektrum durch Resonanzstreuung von Licht in elektrischen und magnetischen Feldern

Hans Bucka, D. Einfeld, J. Ney +1 more

Abstract Using separated isotopes the hyperfine structure of the 5p 2P3/2-state in Ag I-spectrum was investigated by scattering the resonance line on an atomic beam in parallel magnetic and electric fields. With the theoretical positive sign of the Stark-constant β, the shift of the Heydenburg- and level-crossing-signals with electric fields can be explained by the following parameters: Ag (107) : A = - (32,4 ± 0.5) Mc/sec , Ag (109): A - - (37,3 ± 0.8) Mc/sec , β (2P3/2) = (5.15 ± 0.15) (kc/sec) (kV/cm) -2 , τ (2p3/2) = (6.3 ± 0.6 ) · 10-9 sec.Abstract Using separated isotopes the hyperfine structure of the 5p 2P3/2-state in Ag I-spectrum was investigated by scattering the resonance line on an atomic beam in parallel magnetic and electric fields. With the theoretical positive sign of the Stark-constant β, the shift of the Heydenburg- and level-crossing-signals with electric fields can be explained by the following parameters: Ag (107) : A = - (32,4 ± 0.5) Mc/sec , Ag (109): A - - (37,3 ± 0.8) Mc/sec , β (2P3/2) = (5.15 ± 0.15) (kc/sec) (kV/cm) -2 , τ (2p3/2) = (6.3 ± 0.6 ) · 10-9 sec.

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A thermal beam of helium (2 3 S 1 ) metastable atoms was used to excite coherently the 2 P 3/2 levels of Ca, Sr and Ba in a Penning ionising collision. The coherent excitation of the ions appears as a linear polarisation of the optical emission from the excited ions. The degree of linear polarisation is 5.5, 3.5 and 0.5% for Ca, Sr and Ba, respectively, with the polarisation parallel to the beam direction. Hanle effect signals from the 2 P 3/2 level of Sr were observed and the radioactive decay rate measured.A thermal beam of helium (2 3 S 1 ) metastable atoms was used to excite coherently the 2 P 3/2 levels of Ca, Sr and Ba in a Penning ionising collision. The coherent excitation of the ions appears as a linear polarisation of the optical emission from the excited ions. The degree of linear polarisation is 5.5, 3.5 and 0.5% for Ca, Sr and Ba, respectively, with the polarisation parallel to the beam direction. Hanle effect signals from the 2 P 3/2 level of Sr were observed and the radioactive decay rate measured.

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Lifetime of the First Excited Atomic States of Rb87

J. D. Feichtner, Joe H. Gallagher, Masataka Mizushima

The Hanle effect on the resonance lines of the ${\mathrm{Rb}}^{87}$ atom has been observed. The line shape of the signal for the $5^{2}S_{\frac{1}{2}}\ensuremath{\leftrightarrow}5^{2}P_{\frac{3}{2}}$ is found to be Lorentzian, while that for the $5^{2}S_{\frac{1}{2}}\ensuremath{\leftrightarrow}5^{2}P_{\frac{1}{2}}$ is dispersion-type. The half-width of these lines was observed to be 3.146\ifmmode\pm\else\textpm\fi{}0.13 G and 23.0 G\ifmmode\pm\else\textpm\fi{}5%, respectively. These values yield the lifetime of (2.71\ifmmode\pm\else\textpm\fi{}0.14) \ifmmode\times\else\texttimes\fi{}${10}^{\ensuremath{-}8}$sec and (3.0\ifmmode\pm\else\textpm\fi{}0.3)\ifmmode\times\else\texttimes\fi{}${10}^{\ensuremath{-}8}$sec for the $5^{2}P_{\frac{3}{2}}$ and $5^{2}P_{\frac{1}{2}}$ states, respectively. The oscillator strengths for the corresponding transitions are found to be 0.673\ifmmode\pm\else\textpm\fi{}0.03 and 0.32\ifmmode\pm\else\textpm\fi{}0.03, respectively. When the temperature of the scattering cell was changed from 0 to 36\ifmmode^\circ\else\textdegree\fi{}C, an apparent increase of the linewidth at higher temperature was observed. This effect has been explained as a magnetic-field-dependent radiative transfer effect at optical depth of the order of the scattering cell dimensions. When the data were analyzed with such an effect included, the reduced Hanle signal showed no temperature dependence of the half-width.The Hanle effect on the resonance lines of the ${\mathrm{Rb}}^{87}$ atom has been observed. The line shape of the signal for the $5^{2}S_{\frac{1}{2}}\ensuremath{\leftrightarrow}5^{2}P_{\frac{3}{2}}$ is found to be Lorentzian, while that for the $5^{2}S_{\frac{1}{2}}\ensuremath{\leftrightarrow}5^{2}P_{\frac{1}{2}}$ is dispersion-type. The half-width of these lines was observed to be 3.146\ifmmode\pm\else\textpm\fi{}0.13 G and 23.0 G\ifmmode\pm\else\textpm\fi{}5%, respectively. These values yield the lifetime of (2.71\ifmmode\pm\else\textpm\fi{}0.14) \ifmmode\times\else\texttimes\fi{}${10}^{\ensuremath{-}8}$sec and (3.0\ifmmode\pm\else\textpm\fi{}0.3)\ifmmode\times\else\texttimes\fi{}${10}^{\ensuremath{-}8}$sec for the $5^{2}P_{\frac{3}{2}}$ and $5^{2}P_{\frac{1}{2}}$ states, respectively. The oscillator strengths for the corresponding transitions are found to be 0.673\ifmmode\pm\else\textpm\fi{}0.03 and 0.32\ifmmode\pm\else\textpm\fi{}0.03, respectively. When the temperature of the scattering cell was changed from 0 to 36\ifmmode^\circ\else\textdegree\fi{}C, an apparent increase of the linewidth at higher temperature was observed. This effect has been explained as a magnetic-field-dependent radiative transfer effect at optical depth of the order of the scattering cell dimensions. When the data were analyzed with such an effect included, the reduced Hanle signal showed no temperature dependence of the half-width.

Physical ReviewDec 5, 196717 citations

G. Anger, Michael v. Hartrott, H.‐U. Martyn +1 more

Abstract Using atomic beam techniques the polarization of fluorescence lines of the Cu I-spectrum was measured in dependence on magnetic field strength. The Cu-atoms were excited by electron bombardment and the magnetic field was parallel to the electron beam. Due to the decoupling of the hyperfinestructure of excited levels of the Cu I-spectrum the polarization of some observed spectral lines [3247 Å (4p 2P3/2 -4s 2S1/2); 5153 Å (4d 2D3/2 -4p 2P1/2); 5218 Å (4d2D5/2 - 4p 2P3/2)] increases with increasing magnetic field strength. These polarization measurements, which correspond to investigations on resonance scattering of light done by HEYDENBURG et al., can be used for a determination of hfs-coupling constants of excited states. The measurements on the 3247 Å-resonance line are used for a comparison with results of accurate level-crossing-experiments. Satisfactory agreement is obtained. The discussion of the polarization of the 5153 Å-line yields an A-factor of (9.6 ± 1-0) MHz and a lifetime of τ ≈1.7 · 10 -8 sec for the 4d2D3/2-level.Abstract Using atomic beam techniques the polarization of fluorescence lines of the Cu I-spectrum was measured in dependence on magnetic field strength. The Cu-atoms were excited by electron bombardment and the magnetic field was parallel to the electron beam. Due to the decoupling of the hyperfinestructure of excited levels of the Cu I-spectrum the polarization of some observed spectral lines [3247 Å (4p 2P3/2 -4s 2S1/2); 5153 Å (4d 2D3/2 -4p 2P1/2); 5218 Å (4d2D5/2 - 4p 2P3/2)] increases with increasing magnetic field strength. These polarization measurements, which correspond to investigations on resonance scattering of light done by HEYDENBURG et al., can be used for a determination of hfs-coupling constants of excited states. The measurements on the 3247 Å-resonance line are used for a comparison with results of accurate level-crossing-experiments. Satisfactory agreement is obtained. The discussion of the polarization of the 5153 Å-line yields an A-factor of (9.6 ± 1-0) MHz and a lifetime of τ ≈1.7 · 10 -8 sec for the 4d2D3/2-level.

Zeitschrift für Naturforschung ANov 1, 19702 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.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 ReviewMay 5, 1967217 citations

Resonanzstreuung von Licht in magnetischen und elektrischen Feldern zur Untersuchung der Hyperfeinstruktur des 7d 2 D 3/2-Terms im Thallium I-Spektrum

P. Zimmermann

Zeitschrift für Physik A Hadrons and NucleiFeb 1, 19704 citations

The Hanle effect on the resonance lines of the

{\mathrm{Rb}}^{87}

atom has been observed. The line shape of the signal for the $5^{2}S_{\frac{1}{2}}\ensuremath{\leftrightarrow}5^{2}P_{\frac{3}{2}}$ is found to be Lorentzian, while that for the $5^{2}S_{\frac{1}{2}}\ensuremath{\leftrightarrow}5^{2}P_{\frac{1}{2}}$ is dispersion-type. The half-width of these lines was observed to be 3.146\ifmmode\pm\else\textpm\fi{}0.13 G and 23.0 G\ifmmode\pm\else\textpm\fi{}5%, respectively. These values yield the lifetime of (2.71\ifmmode\pm\else\textpm\fi{}0.14) \ifmmode\times\else\texttimes\fi{}${10}^{\ensuremath{-}8}$sec and (3.0\ifmmode\pm\else\textpm\fi{}0.3)\ifmmode\times\else\texttimes\fi{}${10}^{\ensuremath{-}8}$sec for the

5^{2}P_{\frac{3}{2}}

and

5^{2}P_{\frac{1}{2}}

states, respectively. The oscillator strengths for the corresponding transitions are found to be 0.673\ifmmode\pm\else\textpm\fi{}0.03 and 0.32\ifmmode\pm\else\textpm\fi{}0.03, respectively. When the temperature of the scattering cell was changed from 0 to 36\ifmmode^\circ\else\textdegree\fi{}C, an apparent increase of the linewidth at higher temperature was observed. This effect has been explained as a magnetic-field-dependent radiative transfer effect at optical depth of the order of the scattering cell dimensions. When the data were analyzed with such an effect included, the reduced Hanle signal showed no temperature dependence of the half-width.

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.