Abstract

Line-absorption calculations of the 388.9 nm triplet and the 501.6 nm singlet lines of helium have been performed for the Voigt profile. These results can be used to measure the absolute concentration of He 2s 3S and 2s 1S metastable atoms for the various discharge conditions by the reabosorption method.

© 1978 Optical Society of America

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References

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  1. I. Ya Fugol, D. A. Myshkis, and O. N. Grigorashchenko, “Absorption methods for measuring the absolute concentration of metastable helium atoms in a plasma,” Opt. Spectrosc. 31, 282–285 (1971).
  2. A. C. G. Mitchell and M. W. Zemansky, Resonance Radiation and Excited Atoms, 2nd ed. (Cambridge U.P., London, 1971), Chap. III.

1971 (1)

I. Ya Fugol, D. A. Myshkis, and O. N. Grigorashchenko, “Absorption methods for measuring the absolute concentration of metastable helium atoms in a plasma,” Opt. Spectrosc. 31, 282–285 (1971).

Grigorashchenko, O. N.

I. Ya Fugol, D. A. Myshkis, and O. N. Grigorashchenko, “Absorption methods for measuring the absolute concentration of metastable helium atoms in a plasma,” Opt. Spectrosc. 31, 282–285 (1971).

Mitchell, A. C. G.

A. C. G. Mitchell and M. W. Zemansky, Resonance Radiation and Excited Atoms, 2nd ed. (Cambridge U.P., London, 1971), Chap. III.

Myshkis, D. A.

I. Ya Fugol, D. A. Myshkis, and O. N. Grigorashchenko, “Absorption methods for measuring the absolute concentration of metastable helium atoms in a plasma,” Opt. Spectrosc. 31, 282–285 (1971).

Ya Fugol, I.

I. Ya Fugol, D. A. Myshkis, and O. N. Grigorashchenko, “Absorption methods for measuring the absolute concentration of metastable helium atoms in a plasma,” Opt. Spectrosc. 31, 282–285 (1971).

Zemansky, M. W.

A. C. G. Mitchell and M. W. Zemansky, Resonance Radiation and Excited Atoms, 2nd ed. (Cambridge U.P., London, 1971), Chap. III.

Opt. Spectrosc. (1)

I. Ya Fugol, D. A. Myshkis, and O. N. Grigorashchenko, “Absorption methods for measuring the absolute concentration of metastable helium atoms in a plasma,” Opt. Spectrosc. 31, 282–285 (1971).

Other (1)

A. C. G. Mitchell and M. W. Zemansky, Resonance Radiation and Excited Atoms, 2nd ed. (Cambridge U.P., London, 1971), Chap. III.

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Figures (3)

FIG. 1
FIG. 1

Values of the parameter a for various discharge conditions. Solid lines are for the 388.9 nm line and dashed lines are for the 501.6 nm line.

FIG. 2
FIG. 2

Dependence of the line absorption AL on k0l for the 388.9 nm line. 1: a = 0 (purely Doppler profile); 2: a = 0.0125; 3: a = 0.05; 4: a = 0.1; 5: a = 0.5.

FIG. 3
FIG. 3

Dependence of the line absorption AL on k0l for the 501.6 nm line. 1: a = 0 (purely Doppler profile); 2: a = 0.0105; 3: a = 0.05; 4: a = 0.1; 5: a = 0.5.

Equations (10)

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k ν = k 0 i = 1 C i H ( ω + Δ ω i , a ) ,
H ( ω + Δ ω i , a ) = a π - exp ( - y 2 ) a 2 + [ ( ω + Δ ω i ) - y ] 2 d y ,
ω = [ 2 ( ν - ν i ) / Δ ν D ] ( ln 2 ) 1 / 2 ,
Δ ω i = [ 2 ( ν i - ν 1 ) / Δ ν D ] ( ln 2 ) 1 / 2 .
a = [ ( Δ ν N + Δ ν C ) / Δ ν D ] ( ln 2 ) 1 / 2 .
a = 1 . 5 × 10 6 + 2.1 × 10 6 ( 1 + 0.134 T ) P 2.76 × 10 8 T ( ln 2 ) 1 / 2 ,
a = 2.33 × 10 6 + 2.1 × 10 6 ( 1 + 0.170 T ) P 2.136 × 10 8 T ( ln 2 ) 1 / 2 ,
A L = 0 [ 1 - exp ( - k ν l ) ] 2 d ν 0 [ 1 - exp ( - k ν l ) ] d ν ,
A L = 1 + r - I m / I wm r ,
N = 8 π λ 0 2 · g 1 g 2 τ 0 k ν d ν = 8 π λ 0 2 g 1 g 2 1 2 ( π ln 2 ) 1 / 2 Δ ν D k 0 ,