Beam-foil lifetime measurements in Pb III and Pb IV

1988 ◽  
Vol 66 (5) ◽  
pp. 402-404 ◽  
Author(s):  
W. Ansbacher ◽  
E. H. Pinnington ◽  
J. A. Kernahan
Keyword(s):  
Wavelength Range ◽  
Decay Curve ◽  
Polarization Model ◽  
Lifetime Measurements ◽  
Recent Calculation ◽  
Core Correlation ◽  
Intensity Decay ◽  
Beam Foil ◽  
Good Agreement

Beam-foil intensity decay curves for transitions in the wavelength range from 900 to 2200 Å are used to derive the lifetimes of the 6s6p1P1 and 3P1 6s6d1D2, 6s7s1S0, and 6p21D2 levels of Pb III, and the 6p2P1/2 and 2P3/2, 6d2D3/2 and 2D5/2, 7s2S1/2, and 5d96s22D3/2 levels of Pb IV, arbitrarily normalized decay curve (ANDC) analyses being used for the 6s6p and 6p levels. In the case of the two 6s6p levels studied in Pb III, good agreement is found with a recent calculation in which a polarization model accounts for valence–core correlation. However, the agreement between the lifetimes observed for the 6p levels in Pb IV and a similar, earlier calculation is only fair.

Beam-foil measurements of lifetimes of energy levels belonging to Sn III and Sn IV

1987 ◽  
Vol 65 (1) ◽  
pp. 7-12 ◽  
Author(s):  
E. H. Pinnington ◽  
J. A. Kernahan ◽  
W. Ansbacher
Keyword(s):  
Decay Curve ◽  
Energy Levels ◽  
Resonance Transition ◽  
Isoelectronic Sequence ◽  
Core Polarization ◽  
Hartree Fock ◽  
Intensity Decay ◽  
Polarization Calculation ◽  
Beam Foil ◽  
Good Agreement

Beam-foil intensity decay curves for transitions in the wavelength range 750–5250 Å are used to derive the lifetimes of the 6s1S, 5p1P, 6p1P, 5d1D, 6d1D, 5p21D, 4f1F, 6s3S, 6p3p, 5p23p, 5d3D, 6d3D, and 4f3F levels of Sn III, and of the 6s2S, 5p2P, 6p2P, 5d2D, 6d2D, 4d95 s22D, and 4f2F levels of Sn IV. The arbitrarily normalized decay-curve analyses are used for most levels. Good agreement is found between experiment and a recent (relativistic Hartree–Fock + core-polarization) calculation for the resonance transition in low-Z members of the Cd 1 isoelectronic sequence, but the experimental f values are found to lie systematically about 20% above the theoretical trend obtained from a similar calculation for the Ag I sequence. Configuration interaction is found to produce very different lifetimes for the two 4d95s22D levels of Sn IV, and the energy of the J = 3/2 level is determined to be 177 060 ± 50 cm−1.

Beam-foil lifetime measurements for some 2p3nl terms of singly-ionized fluorine

1979 ◽  
Vol 57 (7) ◽  
pp. 1046-1050 ◽  
Author(s):  
Eric H. Pinnington ◽  
Robert N. Gosselin ◽  
David J. G. Irwin ◽  
James A. O'Neill
Keyword(s):  
Wavelength Region ◽  
Lifetime Measurements ◽  
Experimental Values ◽  
Beam Foil ◽  
Foil Technique ◽  
Good Agreement

We have used the beam-foil technique in the wavelength region between 3500 and 4500 Å to measure the lifetimes of 10 terms in F II having the configuration 2p3nl, and also to demonstrate the usefulness of the ANDC method for overcoming the effects of cascade repopulation in these measurements. Our results are in good agreement with theory and with other experimental values.

Accurate transition probabilities for the 2s2 1S - 2s2p 1P transition in Be I and B II

1999 ◽  
Vol 77 (2) ◽  
pp. 137-143 ◽  
Author(s):  
R E Irving ◽  
M Henderson ◽  
L J Curtis ◽  
I Martinson ◽  
P Bengtsson
Keyword(s):  
Decay Curve ◽  
Transition Probabilities ◽  
Theoretical Calculations ◽  
Transition Probability ◽  
Lifetime Measurements ◽  
Beam Foil

Transition probability determinations are reported for the 2s2 1S - 2s2p 1P transition in Be I and B II, based on lifetime measurements made by beam-foil excitation. The lifetimes were extracted by the ANDC method, which incorporates cascade-related decay curves into the analysis of the primary decay curve, thus accounting for the effects of cascade repopulation. The results are of higher precision than earlier measurements and improve the agreement with recent theoretical calculations. PACS No.: 32.70Cs

Cascade-corrected lifetime measurements for singly and doubly ionized indium

1986 ◽  
Vol 64 (10) ◽  
pp. 1365-1368 ◽  
Author(s):  
W. Ansbacher ◽  
E. H. Pinnington ◽  
J. A. Kernahan ◽  
R. N. Gosselin
Keyword(s):  
Resonance Transition ◽  
Lifetime Measurements ◽  
Hartree Fock ◽  
Beam Foil ◽  
Good Agreement

Lifetime measurements obtained by the beam-foil method are given for 13 levels in In II and 12 levels in In III. Particular attention has been paid to cascade correction with the application of a new arbitrarily normalized decay curves (ANDC) program. The results are compared with theory, and good agreement is found with recent multiconfiguration relativistic Hartree–Fock (MCRHF) calculations for the In II resonance transition. The results for 2P and 2D levels in In III and 1D levels in In II indicate a need for further calculations.

Beam-foil lifetime measurements for some 5d10nl and 5d96s6p levels of Pb IV

1991 ◽  
Vol 69 (5) ◽  
pp. 594-596 ◽  
Author(s):  
E. H. Pinnington ◽  
W. Ansbacher ◽  
A. Tauheed ◽  
J. A. Kernahan
Keyword(s):  
Decay Curve ◽  
Lifetime Measurements ◽  
Rigorous Calculation ◽  
Coulomb Approximation ◽  
Beam Foil ◽  
Foil Technique

The beam-foil technique was used to measure the lifetimes of the 5d105f, 5g, 6d, 6h, 7p, 7d, 8s and 5d96s6p [2]0, [3]0, [6]0, [14]0, [17]0 levels of Pb IV. Correlated decay-curve analyses were used to correct for the effects of cascading in the case of the 5d105f, 5g, 6d, and 7p levels. The numerical Coulomb approximation was used to calculate comparison values for the 5d10nl levels. The need for a more rigorous calculation for specific levels is discussed.

Line identifications and lifetime measurements in singly and doubly excited C IV and in C V

1980 ◽  
Vol 58 (8) ◽  
pp. 1093-1098 ◽  
Author(s):  
C. Jacques ◽  
E. J. Knystautas ◽  
R. Drouin ◽  
H. G. Berry
Keyword(s):  
Lifetime Measurements ◽  
Radiative Lifetimes ◽  
Doubly Excited ◽  
Theoretical Predictions ◽  
Beam Foil ◽  
Foil Technique ◽  
Good Agreement

Forty-eight new uv lines have been observed and identified in the singly and doubly excited systems of C IV, and in C V. The beam-foil technique was used to excite the spectra and to measure radiative lifetimes for 16 levels. Good agreement is found with available theoretical predictions.

Lifetime measurements for low-lying levels in Hg I and Hg II using the beam-foil technique

1988 ◽  
Vol 66 (11) ◽  
pp. 960-962 ◽  
Author(s):  
E. H. Pinnington ◽  
W. Ansbacher ◽  
J. A. Kernahan ◽  
T. Ahmad ◽  
Z.-Q. Ge
Keyword(s):  
Energy Loss ◽  
Curve Fitting ◽  
Doppler Shift ◽  
Decay Curve ◽  
Carbon Foil ◽  
Lifetime Measurements ◽  
Resonance Transitions ◽  
Shift Technique ◽  
Beam Foil ◽  
Foil Technique

The techniques of beam-foil spectroscopy are applied to obtain measurements of the lifetimes of the 6s6p1P1, 3P1, 6s6d1D2, 3D1, 3D2, and 3D3 levels of Hg I and the 6p2P1/2, 2P3/2, 6d2D3/2, 2D5/2, and 7s2S1/2 levels of Hg II. The energy loss sustained by the ions in passing through the carbon foil is determined using an extended Doppler-shift technique. Constrained curve-fitting and arbitrarily normalized decay curve analyses are used to overcome problems caused by blending between transitions from the 6s6d1D2 and 3D1 levels of Hg I. The f values obtained from the resonance transitions are 1.14 ± 0.04 (Hg I) and 0.648 ± 0.022 (Hg II), in agreement with the trends found previously for higher Z ions in the Hg I and Au I isoelectronic sequences.

Mean-life measurements for some fluorine transitions in the quartz region

1978 ◽  
Vol 56 (5) ◽  
pp. 517-521 ◽  
Author(s):  
E. H. Pinnington ◽  
D. J. G. Irwin ◽  
A. E. Livingston ◽  
J. A. Kernahan ◽  
R. N. Gosselin ◽  
...  
Keyword(s):  
Data Analysis ◽  
Wavelength Range ◽  
Decay Curve ◽  
The Mean ◽  
Beam Foil ◽  
Foil Technique

The beam-foil technique has been applied to the measurement of the mean lives of seven terms in F III and three terms in F IV, giving rise to transitions in the wavelength range 2150 to 3200 Å. The results are compared with other experimental and theoretical values. Forecasts are made for f-values of some F IV transitions below 500 Å in the 2s2p3–2s22p3p array. Examples of the application of the arbitrarily normalized decay curve (ANDC) method for including the effects of cascade repopulation in the data analysis are discussed.

Lifetime measurements of excited levels in C II and C III by beam-foil experiments

1996 ◽  
Vol 54 (2) ◽  
pp. 179-182 ◽  
Author(s):  
Tapan Nandi ◽  
Nandini Bhattacharya ◽  
M B Kurup ◽  
K G Prasad
Keyword(s):  
Lifetime Measurements ◽  
Beam Foil

Fluorine mean-life measurements below 1000 Å using the beam–foil technique

1976 ◽  
Vol 54 (10) ◽  
pp. 1014-1021 ◽  
Author(s):  
E. H. Pinnington ◽  
D. J. G. Irwin ◽  
A. E. Livingston ◽  
J. A. Kernahan
Keyword(s):  
Satellite Data ◽  
Wavelength Region ◽  
Wave Functions ◽  
Interstellar Clouds ◽  
Beam Foil ◽  
Foil Technique ◽  
Good Agreement

We have used the beam–foil technique to measure mean lives for 16 transitions in F I–F IV in the wavelength region 400 Å–1000 Å. Good agreement is found with the results of recent calculations, particularly those employing correlated wave functions. The f-value trends for 5 isoelectronic sequences are presented in detail (2p5 2P0–2p43s2 D and 2p5 2P0–2p43s 2P in F I; 2p4 3P–2p33s 3D0 in F II; 2p3 2D0–2s2p4 2D and 2p3 4S0–2s2p4 4P in F III). Our f value for the 955 Å multiplet in F I is also used in conjunction with some new satellite data to show that the fluorine abundance is apparently depleted in interstellar clouds by a factor of at least 3 below its solar value.

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