Doubly Excited 1,3Fe States of Two-Electron Atoms under Weakly Coupled Plasma Environment *

S. Dutta,J. K. Saha,S. Bhattacharyya,T. K. Mukherjee

Table 5 Absolute values of the 2pnf (1,3Fe) →2pn’d(1,3D°) (n = 4-6; n’ = 3-6) transition energies (in meV) of plasma embedded He below the He+ (2p) threshold under Debye screening.

Debye screening length (D) in a.u. Transition 100 90 80 70 60 50 40 30 20 1Fe ^ 1D° 2p4f ^ 2p3d 854.25 851.72 848.21 843.20 835.57 823.21 801.09 754.79 623.78 ^ 2p4d 71.70 72.01 72.44 73.01 73.81 75.06 76.97 79.81 77.62 ^ 2p5d* 264.68 360.44 381.82 413.23 ^ 2p6d* 433.29 2p5f — 2p3d 1154.46 1148.52 1140.35 1128.69 1111.15 1082.97 1033.10 929.71 630.08 ^ 2p4d 371.91 368.81 364.58 358.50 349.40 334.82 308.98 254.73 83.92 —2p5d* 35.53 63.63 89.69 127.74 —2p6d* 133.06 2p6f — 2p3d 1307.43 1297.78 1284.57 1265.82 1237.82 1193.17 1114.51 946.91 634.08 — 2p4d 524.89 518.07 508.80 495.63 476.06 445.02 390.38 271.94 87.92 — 2 p5 d 188.50 85.62 54.53 9.39 — 2p6d 19.89 3Fe 3D° 2p4f — 2p3d 734.25 732.05 729.02 724.65 718.03 707.29 688.04 647.69 532.15 — 2p4d 21.93 22.59 23.48 24.75 26.60 29.49 34.28 42.84 55.08 —2p5d* 288.62 284.67 279.28 271.66 —2p6d* 445.89 2p5f — 2p3d 1034.40 1028.79 1021.08 1010.07 993.54 966.98 919.97 822.52 538.40 — 2p4d 322.07 319.32 315.55 310.17 302.12 289.18 266.21 217.67 61.33 — 2 p5 d 11.53 12.07 12.79 13.77 —2p6d* 145.74 2p6f — 2p3d 1187.31 1177.99 1165.24 1147.14 1120.14 1077.10 1001.31 839.68 542.41 — 2p4d 474.99 468.52 459.71 447.24 428.72 399.29 347.55 234.83 65.34 — 2 p5 d 164.44 161.26 156.95 150.84 — 2p6d 7.17