Mean lifetime measurements of F II and F III levels using beam-foil technique

Pramana ◽  
1998 ◽  
Vol 50 (3) ◽  
pp. 231-237
Author(s):  
B N Raja Sekhar ◽  
S Padmanabhan ◽  
Aparna Shastri ◽  
P Meenakshi Raja Rao ◽  
M B Kurup ◽  
...  
Keyword(s):  
Lifetime Measurements ◽  
Mean Lifetime ◽  
Beam Foil ◽  
Foil Technique

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.

Beam-foil lifetime measurements for Ga II and Ga III using a field-emission ion source

1985 ◽  
Vol 63 (10) ◽  
pp. 1330-1333 ◽  
Author(s):  
W. Ansbacher ◽  
E. H. Pinnington ◽  
J. L. Bahr ◽  
J. A. Kernahan
Keyword(s):  
Field Emission ◽  
Ion Source ◽  
Resonance Transition ◽  
Lifetime Measurements ◽  
Graaff Accelerator ◽  
Van De Graaff ◽  
Beam Foil ◽  
Foil Technique

A brief description is given of the modifications to a 2-MV Van de Graaff accelerator that are required to incorporate a field-emission ion source. The source is used to obtain a 1-μA beam of Ga+ ions. Lifetime measurements using the beam-foil technique are reported for the 4s5s1S, 4s4p1P, 4s4d1D, 4s5d1D, 4p21D, 4s5s3S, 4p23p, and 4s4d3D terms of Ga II and for the 5s2S, 4p2P, 4d2D, and 5f2F terms of Ga III. A detailed discussion is given of the cascading problem in the case of the Ga II resonance transition at 1414 Å.

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.

Lifetime measurements of autoionizing levels by the beam-foil technique

1971 ◽  
Vol 36 (3) ◽  
pp. 237-238 ◽  
Author(s):  
H.G. Berry ◽  
J. Desesquelles ◽  
M. Dufay
Keyword(s):  
Lifetime Measurements ◽  
Beam Foil ◽  
Foil Technique

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 in N III using the beam-foil technique and cascade corrections

1995 ◽  
Vol 52 (5) ◽  
pp. 506-510 ◽  
Author(s):  
P Bengtsson ◽  
L J Curtis ◽  
M Henderson ◽  
R E Irving ◽  
S T Maniak
Keyword(s):  
Lifetime Measurements ◽  
Beam Foil ◽  
Foil Technique

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.

Lifetime Measurements in Fluorine and Silicon in the Vacuum Ultraviolet

1973 ◽  
Vol 51 (8) ◽  
pp. 848-851 ◽  
Author(s):  
D. J. G. Irwin ◽  
A. E. Livingston
Keyword(s):  
Vacuum Ultraviolet ◽  
Lifetime Measurements ◽  
Radiative Lifetimes ◽  
Beam Foil ◽  
Theory And Experiment ◽  
Foil Technique ◽  
Silicon Beams

We have measured radiative lifetimes for 19 excited levels in F I–IV and Si II–IV by the beam–foil technique. The production of silicon beams by the use of SF6 as the source gas is discussed. The lifetime results are compared with theory and experiment where possible, and 7 new experimental lifetimes are presented.

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
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