Abstract

A nomograph for finding the Doppler linewidth in terms of a given wavelength, temperature, and atomic mass is described. For a more accurate evaluation in terms of elemental atomic number Z, a table of constants is provided.

© 1980 Optical Society of America

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References

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  1. D. H. Menzel, Fundamental Formulas of Physics (Dover, New York, 1960), Chap. 3.

Menzel, D. H.

D. H. Menzel, Fundamental Formulas of Physics (Dover, New York, 1960), Chap. 3.

Other (1)

D. H. Menzel, Fundamental Formulas of Physics (Dover, New York, 1960), Chap. 3.

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Figures (1)

FIG. 1
FIG. 1

Nomograph for Doppler linewidths: λ in Å; T in °K; M is the atomic weight, (a) Use left-hand scales (λ, T) to find x. (b) Use right-hand scales (x,M) to find Δλ.

Tables (1)

Tables Icon

TABLE I Values of kz (Z = atomic number) for use in the Doppler linewidth formula Δλ = kzT1/2) × 10−7

Equations (3)

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ln Δ λ = ln k λ + ½ ln T ½ ln M
| ξ / 2 ½ 1 u 1 1 1 u 2 0 1 | = 0 ,
y 1 = 5 ln ( 10 5 / 2 k λ ) ; y 2 = 10 ln ( k λ T 1 / 2 ) ; y 3 = ( 5 / 2 ) ln ( k λ T 1 / 2 ) ; y 4 = 5 ln Δ λ + ( 5 / 2 ) ln 10 ; y 5 = 5 ln ( T 1 / 2 / 10 5 / 2 ) ; y 6 = 5 ln ( 10 / M ) .