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σ 1s σ 2s σ 2p σ 3s σ 3p σ 3d

H + + Er(nl=1s) → H + + Er + + e-

Table 1 (Theory)

E, MeV σ 1s , 10 -16 cm 2
KH69 BE78
0.10 — .1442E-15
0.15 — .1662E-14
0.20 — .7484E-14
0.30 — .5178E-13
0.50 — .4935E-12
0.70 .2751E-11 .1964E-11
1.0 .1064E-10 .8166E-11
1.5 .4796E-10 .3799E-10
2.0 .1272E-09 .1092E-09
3.0 .5248E-09 .4521E-09
5.0 .2446E-08 .2340E-08
7.0 .6273E-08 .6126E-08
10. .1555E-07 .1524E-07
15. .3752E-07 .3671E-07
20. .6207E-07 .6172E-07
30. .1095E-06 .1103E-06
50. .1791E-06 .1790E-06
70. .2161E-06 .2149E-06
100. .2344E-06 .2343E-06
150. .2301E-06 .2302E-06
200. .2127E-06 .2133E-06
300. .1786E-06 .1788E-06
500. .1324E-06 .1320E-06
700. .1035E-06 .1044E-06
1000. .7915E-07 .7997E-07
1500. — .5799E-07
2000. — .4591E-07
3000. — .3281E-07
5000. — .2132E-07
7000. — .1596E-07

H + + Er(nl=2s) → H + + Er + + e-

Table 2 (Theory)

E, MeV σ 2s , 10 -16 cm 2
CH73 BE78
0.01 — .6451E-15
0.015 — .3510E-13
0.02 — .2445E-12
0.03 — .2276E-11
0.05 — .2346E-10
0.07 — .9758E-10
0.10 — .3775E-09
0.15 — .1544E-08
0.20 .4541E-08 .3736E-08
0.30 .1206E-07 .1071E-07
0.50 .2709E-07 .2638E-07
0.70 .3555E-07 .3476E-07
1.0 .4942E-07 .4871E-07
1.5 .1836E-06 .1832E-06
2.0 .5253E-06 .5249E-06
3.0 .1677E-05 .1664E-05
5.0 .4305E-05 .4256E-05
7.0 .6179E-05 .6162E-05
10. .7877E-05 .7776E-05
15. .8610E-05 .8576E-05
20. .8413E-05 .8449E-05
30. .7409E-05 .7549E-05
50. .5691E-05 .5876E-05
70. .4542E-05 .4783E-05
100. .3499E-05 .3748E-05
150. .2560E-05 .2787E-05
200. .2039E-05 .2235E-05
300. .1471E-05 .1620E-05
500. .9646E-06 .1062E-05
700. .7249E-06 .8043E-06
1000. — .5935E-06
1500. — .4196E-06
2000. — .3271E-06

H + + Er(nl=2p) → H + + Er + + e-

Table 3 (Theory)

E, MeV σ 2p , 10 -16 cm 2
CH73 BE78
0.007 — .5756E-20
0.01 — .7267E-16
0.015 — .4922E-14
0.02 — .4235E-13
0.03 — .5754E-12
0.05 — .9917E-11
0.07 — .5690E-10
0.10 — .3108E-09
0.15 — .1962E-08
0.20 .1090E-07 .6547E-08
0.30 .4356E-07 .3115E-07
0.50 .1775E-06 .1697E-06
0.70 .4561E-06 .4434E-06
1.0 .1091E-05 .1069E-05
1.5 .2561E-05 .2530E-05
2.0 .4340E-05 .4302E-05
3.0 .8254E-05 .8197E-05
5.0 .1554E-04 .1545E-04
7.0 .2086E-04 .2090E-04
10. .2627E-04 .2611E-04
15. .2994E-04 .2980E-04
20. .3057E-04 .3050E-04
30. .2869E-04 .2881E-04
50. .2345E-04 .2372E-04
70. .1922E-04 .1971E-04
100. .1499E-04 .1563E-04
150. .1100E-04 .1168E-04
200. .8758E-05 .9366E-05
300. .6303E-05 .6780E-05
500. .4114E-05 .4445E-05
700. .3082E-05 .3350E-05
1000. — .2467E-05
1500. — .1742E-05
2000. — .1356E-05

H + + Er(nl=3s) → H + + Er + + e-

Table 4 (Theory)

E, MeV σ 3s , 10 -16 cm 2
JO79
0.002 .1149E-10
0.003 .5276E-10
0.005 .3359E-09
0.007 .1065E-08
0.01 .3337E-08
0.015 .1041E-07
0.02 .2032E-07
0.03 .3865E-07
0.05 .5830E-07
0.07 .1434E-06
0.10 .5450E-06
0.15 .1499E-05
0.20 .2130E-05
0.30 .3349E-05
0.50 .1415E-04
0.70 .3416E-04
1.0 .6697E-04
1.5 .1097E-03
2.0 .1356E-03
3.0 .1557E-03
5.0 .1555E-03
7.0 .1414E-03
10. .1210E-03
15. .9649E-04
20. .8079E-04
30. .6082E-04
50. .4141E-04
70. .3182E-04
100. .2384E-04
150. .1707E-04
200. .1356E-04
300. .9585E-05
500. .6172E-05
700. .4625E-05
1000. .3387E-05

H + + Er(nl=3p) → H + + Er + + e-

Table 5 (Theory)

E, MeV σ 3p , 10 -16 cm 2
JO79
0.002 .5512E-11
0.003 .3782E-10
0.005 .3994E-09
0.007 .1774E-08
0.01 .7955E-08
0.015 .3862E-07
0.02 .1055E-06
0.03 .3598E-06
0.05 .1170E-05
0.07 .2112E-05
0.10 .3819E-05
0.15 .8521E-05
0.20 .1624E-04
0.30 .4025E-04
0.50 .1125E-03
0.70 .1946E-03
1.0 .3072E-03
1.5 .4435E-03
2.0 .5247E-03
3.0 .6025E-03
5.0 .6099E-03
7.0 .5665E-03
10. .4957E-03
15. .4049E-03
20. .3413E-03
30. .2633E-03
50. .1826E-03
70. .1416E-03
100. .1072E-03
150. .7794E-04
200. .6199E-04
300. .4394E-04
500. .2862E-04
700. .2156E-04

H + + Er(nl=3d) → H + + Er + + e-

Table 6 (Theory)

E, MeV σ 3d , 10 -16 cm 2
JO79
0.001 .3293E-14
0.002 .2770E-12
0.003 .2945E-11
0.005 .5322E-10
0.007 .3427E-09
0.01 .2354E-08
0.015 .1889E-07
0.02 .7626E-07
0.03 .4781E-06
0.05 .3685E-05
0.07 .1158E-04
0.10 .3245E-04
0.15 .8193E-04
0.20 .1295E-03
0.30 .2482E-03
0.50 .4613E-03
0.70 .6672E-03
1.0 .9437E-03
1.5 .1290E-02
2.0 .1512E-02
3.0 .1727E-02
5.0 .1756E-02
7.0 .1634E-02
10. .1425E-02
15. .1148E-02
20. .9580E-03
30. .7214E-03
50. .4884E-03
70. .3735E-03
100. .2797E-03
150. .1999E-03
200. .1570E-03
300. .1111E-03
500. .7164E-04
700. .5350E-04