Supplementary data Excited electronic states of Sr_2: ab initio predictions and experimental observation of the 2^1\Sigma^+_u state J. Szczepkowski,M. Gronowski, A. Grochola, W. Jastrzebski, M. Tomza, P. Kowalczyk ------------------------------------------------------------------------------------ The rotationless RKR potential energy curve for the 2^1\Sigma^+_u state of Sr_2. The first line refers to the bottom of the potential curve, the corresponding R value is the equilibrium distance. T_e= 17358.70(10)[cm-1] v' Gv[cm-1] R-[A] R+[A] ------------------------------------------ 0 4.1763 0 42.024 4.0840 4.2751 1 125.703 4.0202 4.3521 2 208.838 3.9779 4.4076 3 291.421 3.9446 4.4545 4 373.445 3.9165 4.4963 5 454.903 3.8920 4.5347 6 535.786 3.8700 4.5708 7 616.087 3.8500 4.6051 8 695.797 3.8317 4.6380 9 774.908 3.8147 4.6698 10 853.411 3.7989 4.7007 11 931.296 3.7840 4.7308 12 1008.555 3.7700 4.7604 13 1085.178 3.7568 4.7895 14 1161.155 3.7442 4.8182 15 1236.475 3.7323 4.8465 16 1311.129 3.7209 4.8747 17 1385.106 3.7101 4.9026 18 1458.395 3.6997 4.9304 19 1530.984 3.6897 4.9581 20 1602.863 3.6802 4.9858 21 1674.020 3.6710 5.0135 22 1744.442 3.6622 5.0412 23 1814.117 3.6537 5.0690 24 1883.034 3.6456 5.0968 25 1951.179 3.6377 5.1248 26 2018.540 3.6302 5.1530 27 2085.103 3.6229 5.1814 28 2150.854 3.6159 5.2100 29 2215.780 3.6091 5.2389 30 2279.868 3.6026 5.2681 31 2343.102 3.5963 5.2975 32 2405.468 3.5902 5.3274 33 2466.952 3.5843 5.3576 34 2527.538 3.5787 5.3883 35 2587.211 3.5732 5.4194 36 2645.955 3.5679 5.4510 37 2703.756 3.5628 5.4831 38 2760.596 3.5579 5.5158 39 2816.459 3.5532 5.5491 40 2871.329 3.5486 5.5830 41 2925.189 3.5442 5.6177 42 2978.022 3.5399 5.6530 43 3029.811 3.5358 5.6892 44 3080.537 3.5318 5.7262 45 3130.183 3.5280 5.7641 46 3178.731 3.5242 5.8030 47 3226.162 3.5206 5.8429 48 3272.459 3.5171 5.8840 49 3317.601 3.5137 5.9262 50 3361.570 3.5104 5.9697 51 3404.346 3.5071 6.0145 52 3445.910 3.5039 6.0609