†This paper is based upon a Ph.D. thesis submitted by David R. Wood to Purdue University (June 1967). Present address: Department of Physics, Wright State University, Dayton, Ohio 45431.
New grating and interferometric measurements of the first emission spectrum of lead have been made using electrodeless discharge tubes containing halides of 208Pb. In the spectral region from 1977 to 12561 Å, 370 classified lines were measured, of which 90 are new. Nineteen new even levels and four new odd levels have been established; the classifications of nine levels have been changed to different electron configurations. The lower series limit of lead was determined from three Rydberg series to be 59819.4 ± 0.3 cm−1, and the separation of the two limits, 14081.074 ± 0.004 cm−1, was measured directly from the forbidden Pb ii transition,
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A series of hydrogenic levels observed by Gieseler and Grotrian in 1925 but omitted from AEL was confirmed for n = 5 to 9 and extended to n = 10. We have identified this as the 6png1/2[7/2]3 series of levels, the observed lines being forbidden Δl = 3 transitions to the J = 2 members of the 6p2 and 6p7p configurations. This is believed to be the first ng series identified in a two-electron neutral spectrum. In addition to the formerly observed even-even forbidden transitions between individual members of the 6p2 ground configuration, we also observed such transitions to 6p2 from 6p7p and 6p5f levels.
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The symbols following the intensity describe the character of the line; A for asymmetric, D for diffuse, and R for self reversed.
The symbol N is included before the wave number of each new line, and a C precedes the wave number of each newly classified transition. Interferometric measurements are indicated by an I before the wave number.
The classification is given in terms of the code numbers for the two levels; jj or jK designations may be found in Tables III and IV. Even–even forbidden transitions are designated by an F following the classification.
Vacuum wavelengths are given below 2000 Å. Above this value the wavelengths are those for standard air. The Fabry–Perot measurements were made in vacuum and corrections were made to standard air by means of Edlén’s formula. Paschen–Runge wavelengths were corrected to standard atmospheric conditions, also by use of Edlén’s formula.
New energy levels are preceded by the symbol N. Levels which have been reclassified are preceded by C and levels determined from the infrared measurements of Humphreys are preceded by H. Energy levels determined from only one transition are enclosed in parentheses.
New energy levels are preceded by the symbol N. Levels which have been reclassified are preceded by C and levels determined from the infrared measurements of Humphreys are preceded by H. Energy levels determined from only one transition are enclosed in parentheses.
Table V
Average purity (%) of eigenvectors in the four representations.
The symbols following the intensity describe the character of the line; A for asymmetric, D for diffuse, and R for self reversed.
The symbol N is included before the wave number of each new line, and a C precedes the wave number of each newly classified transition. Interferometric measurements are indicated by an I before the wave number.
The classification is given in terms of the code numbers for the two levels; jj or jK designations may be found in Tables III and IV. Even–even forbidden transitions are designated by an F following the classification.
Vacuum wavelengths are given below 2000 Å. Above this value the wavelengths are those for standard air. The Fabry–Perot measurements were made in vacuum and corrections were made to standard air by means of Edlén’s formula. Paschen–Runge wavelengths were corrected to standard atmospheric conditions, also by use of Edlén’s formula.
New energy levels are preceded by the symbol N. Levels which have been reclassified are preceded by C and levels determined from the infrared measurements of Humphreys are preceded by H. Energy levels determined from only one transition are enclosed in parentheses.
New energy levels are preceded by the symbol N. Levels which have been reclassified are preceded by C and levels determined from the infrared measurements of Humphreys are preceded by H. Energy levels determined from only one transition are enclosed in parentheses.
Table V
Average purity (%) of eigenvectors in the four representations.