I 11 Continued I 11—Continued Config. Desig. J Level Interval Obs. g Config. Desig. J Level Obs. g 582 5p3 (Po) 68 582 5p3 (2P°) 6p 6p' S 1 128570. 61 1. 73 582 573 (-Do)6d 1 130622. 62 or Interval 60. 66 624. 78 4007. 6 -311. 72 5 124749. 64 58. 35 583 5p8('8°) 7P 7p SP 1 124958. 36 133. 43 1. 09 582 5p) ('80)5f 5f 'F 0.83 1. 04 2 125229. 61 4. 76 585p3 (Do)78 – 125. 28 582 5p3 ("8°)6d 6d Do 3 125295. 68 40. 80 1. 28 1. 095 0. 674 585p3 ("°) 98 583 5p) (ap) 6p 6p" :D 582 573 (+8°)98 1 125532. 05 3906. 70 0.83 585p* (-Do)78 7. Do 127897 0.89 1 2 3 I 11 (“Siy) December 1957. 5р эр 5pt is { { 5p3 3po 5p3 ipo 5, 6d' 3po 5, 6d' 3D° 50' 37° 6, 7p' 3P 6, 7p' 3D 6, 7p' 3F 6, 7p' 'P 6p' D 6, 7p' IF 6p'' 3P 6p'' :D { { 50' 1Go 68” “P 68'' ipo 6p'' 3S 5d” 3D° K I. P. volts Seth has reported 20 levels, based on measurements by L. and E. Bloch, which he assigns to 68, 6p, and 5d electrons. In the 1949 reference below it is stated that a few additional levels, and possibly two series members are known. Spectrograms of I III covering a long spectral range are needed to confirm and extend the present work on analysis. In OBSERVED TERMS* Configuration Observed Terms 582 5p4 58 5p5 ns (n=6) np (n26) nd (n>5) nf (n>4) 582 5p8(*S°)nx 6, to 98 58° 6, to 98 38° 6, 7p5P 6p 3P 5 to 7d 5Do 5, 6d 3Do 58 SF 585p (Dont' 582 5p3 (P°) nx'' *For predicted terms in the spectrum of the Te i isoelectronic sequence, see Vol. III, Introduction. I III (Sb I sequence; 51 electrons) Z=53 Ground state 182 282 2p 3s 3p 3,10 482 4po 4d10 585p8 48 % 5p3 Six REFERENCES J. B. Seth, Proc. Indian Acad. Sci. 1A, 593 (1935). (T) (CL) 8. G. Krishnamurty and T. V. Parthasaradhy, Nature 164, 407 (1949). October 1953. This spectrum has not been adequately investigated. Krishnamurty has reported 68 lines between 2224.43 A and 3546.90 A, half of which he has classified as combinations among 9 even levels and 10 odd levels. By a comparison of isoelectronic data he assigns some term designations and assumes an arbitrary absolute value of 192000.0 K for 68 3P%. Accurate measurements in the short-wave region are needed to establish the ground term and extend the study. Lacking these, the writer has made a crude extrapolation that places 68 8P, roughly 154000 K above the ground state zero. She estimates the value of the limit as approximately 345000 K, and the ionization potential as roughly 43 + volts. The error in all these estimates is probably large. Krishnamurty and Fernando have utilized measurements by L. and E. Bloch to work out an array of 6 multiplets from 17 lines in the range 483 A to 919 A. They suggest combinations giving intervals for the 5p 3po term that are not inconsistent with those extrapolated along the sequence. Confirmation is needed. REFERENCE 8. G. Krishnamurty and I. Fernando, Indian J. Phys. 23, 172 (1949). (CL) August 1953. Little is known about this spectrum. Five lines measured by L. Bloch, E. Bloch, and N. Felici have been attributed to I vil and classified by Fernando. The terms have been worked out by the writer from these lines. Kruger and Shoupp have classified three lines between 190 A and 196 A as combinations with the ground term, and determined the limit from a study of the Moseley diagram of the isoelectronic sequence. The writer has rounded off their term values, and assigned the J-value of the parent term by analogy with Pd 1. Two of the lines have been classified independently in the 1937 paper listed below. The quoted ionization potential may be in error by several volts. REFERENCES The observations of Xe i extend from 926 A to 21048 A. Those in the infrared region beyond the photographic limit are listed in the 1949 and 1952 references by Sittner and Peck, and by Humphreys and Kostkowski, respectively. The ultraviolet observations have been extended by Beutler to 926 A, i. e. beyond the limit, 1192 A, reached by Boyce. The energy levels have been taken from an unpublished manuscript kindly furnished by Edlén, who has made a critical study of the published papers on Xe 1. Most of the levels are listed in the extensive term array given by Humphreys and Meggers in 1933. Three-place entries are from interferometric measurements. Predicted values, furnished by Edlén, are in brackets. The observed g-values are from the 1941 paper, by Green, Hurlburt, and Bowman. Pogány has also published a shorter list of g-values. The limit given by Boyce, 97834.4 K, has been used for the present compilation. The other levels are relative to the absolute value of 68[14];=30766.353, adopted by Humphreys and Meggers. White has discussed the effect of autoionization on the appearance of higher series members having the limit ’Pöy Beutler has observed a number of these lines in absorption. The levels ns'[0x4]°, n=8 to 12 and nd'[1%]o, n=6 to 18, are from his paper. The separation of the two limits 'Pix-Pox as observed by Edlén (1944) in Xe 1 is 10537.01 K. The Paschen notation is entered in the first column of the table. The letters X, Y, T, Z, U, V, and W, adopted when configurations involving f-electrons were found, are also included in this column. As for the other inert gases, Edlén has suggested a pair-coupling notation to take into account the departure from LS-coupling. By analogy with the other inert gas spectra, and by taking into account the general run of the observed g-values, the writer has assigned the following provisional LS-designations, although they have little, if any, significance in most 3–7d0 3-7d8 3-7d3 3-7d 3-9d, 3–7d;' 3–7d; 3-7d, 5- 9d 'P8 5- 9d'P; 5- 9d'P; 5- 9d'F; 5-11d'F; 5- 9d'F; 5- 9d 'F: 5- 9diPi 381 38%. 381 381 50'D: 2-4210 2-4p0 2-578 2-421 2-5po 2-5p8 6-8p's 4-6X 4-63:D 4-68'D 4-6 D 4-69 D, |