Mean lives of 7 of the 10 5p atomic levels in Ar i have been determined using electronic excitation and a method of delayed coincidence. The measured values, in nanoseconds, of the mean lives of the 3p1 and 3p5 through 3p10 levels (Paschen notation) in neutral argon are: 3p1, 71±2; 3p5, 95±2; 3p6, 124±3; 3p7, 149±3; 3p8, 166±5; 3p9, 141±2; and 3p10, 189±3. The error given with each lifetime is the standard deviation in the mean as evaluated from the dispersion of the individual measurements. Wavelengths used in the determinations ranged from 4159 to 4702 Å. The lifetimes were estimated to contain systematic errors varying from 5% to 15% and are presented in comparison with values obtained by combining theoretical calculations with other experimental results.
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H. M. Crosswhite and G. H. Dieke, in American Institute of Physics Handbook (McGraw-Hill Book Company, New York, 1963), 2nd ed., p. 7.
H. M. Crosswhite (private communication).
Determined from energy levels given by C. E. Moore, Atomic Energy Levels, NIBS Circular 467 (U. S. Government Printing Office, Washington, D. C., 1949), Vol. 1, p. 212.
The error given here is the standard error (standard deviation in the mean) in the mean life.
The relative values adopted for the probabilities of the 5p → 4s transitions (conventional notation) are the mean relative values from the literature, determined by C. H. Corliss and J. B. Shumaker, Jr., J. Res. Natl. Bur. Std. (U. S.) 71A, 575 (1967).
Probabilities for 5p → 4s transitions not included in the reference in note b were supplied on the same relative scale by J. B. Shumaker, Jr. (private communication).
The absolute scale adopted for the 5p → 4s transition array is the one suggested by W. L. Wiese, in Contributed Papers of the Eighth International Conference on Phenomena in Ionized Gases, Vienna, Austria, Aug. 27–Sept. 2, 1967 (Springer-Verlag, Vienna, 1967), p. 447.
The transition probabilities adopted for the 5p → 5s array were determined from the intermediate-coupling calculations of P. W. Murphy (private communication).
Transition probabilities for the 5p → 3d array were calculated from line strengths tabulated by B. Warner, Mon. Not. Roy. Astron. Soc. 139, 273 (1968).
Tables (2)
Table I
Wavelengths in angstrom units for the 3p → 1s transition array (Paschen notation) in Ar i.a,b
H. M. Crosswhite and G. H. Dieke, in American Institute of Physics Handbook (McGraw-Hill Book Company, New York, 1963), 2nd ed., p. 7.
H. M. Crosswhite (private communication).
Determined from energy levels given by C. E. Moore, Atomic Energy Levels, NIBS Circular 467 (U. S. Government Printing Office, Washington, D. C., 1949), Vol. 1, p. 212.
The error given here is the standard error (standard deviation in the mean) in the mean life.
The relative values adopted for the probabilities of the 5p → 4s transitions (conventional notation) are the mean relative values from the literature, determined by C. H. Corliss and J. B. Shumaker, Jr., J. Res. Natl. Bur. Std. (U. S.) 71A, 575 (1967).
Probabilities for 5p → 4s transitions not included in the reference in note b were supplied on the same relative scale by J. B. Shumaker, Jr. (private communication).
The absolute scale adopted for the 5p → 4s transition array is the one suggested by W. L. Wiese, in Contributed Papers of the Eighth International Conference on Phenomena in Ionized Gases, Vienna, Austria, Aug. 27–Sept. 2, 1967 (Springer-Verlag, Vienna, 1967), p. 447.
The transition probabilities adopted for the 5p → 5s array were determined from the intermediate-coupling calculations of P. W. Murphy (private communication).
Transition probabilities for the 5p → 3d array were calculated from line strengths tabulated by B. Warner, Mon. Not. Roy. Astron. Soc. 139, 273 (1968).
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