Abstract

Lifetimes of the 3d 2D and 4d 2D terms of lithium are found to be 16.7±1.0 nsec and 42.3±1.5 nsec by counting single quanta with a delayed-coincidence method.

© 1967 Optical Society of America

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References

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  1. F. Karstensen, Z. Physik 187, 165 (1965).
    [CrossRef]
  2. F. Karstensen and J. Schramm, Z. Physik 195, 370 (1966).
    [CrossRef]
  3. D. R. Bates and A. Damgaard, Phil. Trans. Roy. Soc. London,  A242, 101 (1949).
  4. C. W. Allen, Astrophysical Quantities (Athlone Press, London, 1955), p. 60.
  5. O. S. Heavens, J. Opt. Soc. Am. 51, 1058 (1961).
    [CrossRef]

1966 (1)

F. Karstensen and J. Schramm, Z. Physik 195, 370 (1966).
[CrossRef]

1965 (1)

F. Karstensen, Z. Physik 187, 165 (1965).
[CrossRef]

1961 (1)

1949 (1)

D. R. Bates and A. Damgaard, Phil. Trans. Roy. Soc. London,  A242, 101 (1949).

Allen, C. W.

C. W. Allen, Astrophysical Quantities (Athlone Press, London, 1955), p. 60.

Bates, D. R.

D. R. Bates and A. Damgaard, Phil. Trans. Roy. Soc. London,  A242, 101 (1949).

Damgaard, A.

D. R. Bates and A. Damgaard, Phil. Trans. Roy. Soc. London,  A242, 101 (1949).

Heavens, O. S.

Karstensen, F.

F. Karstensen and J. Schramm, Z. Physik 195, 370 (1966).
[CrossRef]

F. Karstensen, Z. Physik 187, 165 (1965).
[CrossRef]

Schramm, J.

F. Karstensen and J. Schramm, Z. Physik 195, 370 (1966).
[CrossRef]

J. Opt. Soc. Am. (1)

Phil. Trans. Roy. Soc. London (1)

D. R. Bates and A. Damgaard, Phil. Trans. Roy. Soc. London,  A242, 101 (1949).

Z. Physik (2)

F. Karstensen, Z. Physik 187, 165 (1965).
[CrossRef]

F. Karstensen and J. Schramm, Z. Physik 195, 370 (1966).
[CrossRef]

Other (1)

C. W. Allen, Astrophysical Quantities (Athlone Press, London, 1955), p. 60.

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Figures (2)

Fig. 1
Fig. 1

Term scheme of lithium, with observed lines (——) and cascading transitions (— — — —).

Fig. 2
Fig. 2

Standardized number of counts as function of time. Upper curve for the 4D term of lithium, lower curves for the 3D term with different influence of cascading effects.

Tables (3)

Tables Icon

Table I Relative total cross sections for excitation of lithium by 11 eV electrons.

Tables Icon

Table II Calculated lifetimes and branching ratios.

Equations (9)

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n 2 = n 20 e - t / τ 2 .
d n 1 / d t = - ( n 1 / τ 1 ) + ( n 20 / τ 2 ) e - t / τ 1 .
n 1 = n 10 e - t / τ 1 [ 1 + C ( t ) ] .
C ( t ) = ( n 20 / n 10 a ) ( e at / τ 2 - 1 )
a = ( τ 2 / τ 1 ) - 1.
I = const n 1 .
α = d log I d t | t = 0 = - 1 τ 1 + n 20 n 10 τ 2 .
n 20 = n 20 e - t / τ 2 ,             from ( 6 )             n 10 = const I ,
1 / τ 1 = - α + ( A / I ) e - t τ 2