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σ 1s σ 2s σ 2p σ 3s σ 3p σ 3d

H + + At(nl=1s) → H + + At + + e-

Table 1 (Theory)

E, MeV σ 1s , 10 -16 cm 2
BE78
0.20 .1372E-15
0.30 .1329E-14
0.50 .1607E-13
0.70 .7030E-13
1.0 .3206E-12
1.5 .1637E-11
2.0 .5053E-11
3.0 .2341E-10
5.0 .1466E-09
7.0 .4445E-09
10. .1333E-08
15. .4042E-08
20. .8090E-08
30. .1853E-07
50. .4037E-07
70. .5770E-07
100. .7410E-07
150. .8535E-07
200. .8674E-07
300. .8042E-07
500. .6447E-07
700. .5271E-07
1000. .4127E-07
1500. .3039E-07
2000. .2420E-07
3000. .1736E-07
5000. .1132E-07
7000. .8476E-08

H + + At(nl=2s) → H + + At + + e-

Table 2 (Theory)

E, MeV σ 2s , 10 -16 cm 2
BE78
0.02 .4759E-15
0.03 .1743E-13
0.05 .3480E-12
0.07 .1838E-11
0.10 .8659E-11
0.15 .4573E-10
0.20 .1348E-09
0.30 .5473E-09
0.50 .2425E-08
0.70 .5237E-08
1.0 .9237E-08
1.5 .1258E-07
2.0 .1784E-07
3.0 .7304E-07
5.0 .4083E-06
7.0 .8904E-06
10. .1566E-05
15. .2284E-05
20. .2617E-05
30. .2738E-05
50. .2425E-05
70. .2079E-05
100. .1690E-05
150. .1292E-05
200. .1050E-05
300. .7721E-06
500. .5127E-06
700. .3893E-06
1000. .2875E-06
1500. .2040E-06
2000. .1592E-06

H + + At(nl=2p) → H + + At + + e-

Table 3 (Theory)

E, MeV σ 2p , 10 -16 cm 2
CH73 BE78
0.015 — .2596E-17
0.02 — .1372E-15
0.03 — .4604E-14
0.05 — .1261E-12
0.07 — .9185E-12
0.10 — .6012E-11
0.15 — .4633E-10
0.20 — .1790E-09
0.30 .1461E-08 .1070E-08
0.50 .1097E-07 .7996E-08
0.70 .2996E-07 .2652E-07
1.0 .8793E-07 .8080E-07
1.5 .2536E-06 .2429E-06
2.0 .5008E-06 .4777E-06
3.0 .1113E-05 .1096E-05
5.0 .2618E-05 .2604E-05
7.0 .4141E-05 .4129E-05
10. .6106E-05 .6092E-05
15. .8318E-05 .8309E-05
20. .9401E-05 .9538E-05
30. .1035E-04 .1038E-04
50. .9778E-05 .9807E-05
70. .8640E-05 .8695E-05
100. .7157E-05 .7235E-05
150. .5447E-05 .5587E-05
200. .4363E-05 .4544E-05
300. .3166E-05 .3325E-05
500. .2081E-05 .2189E-05
700. .1622E-05 .1652E-05
1000. .1167E-05 .1218E-05
1500. — .8584E-06
2000. — .6674E-06

H + + At(nl=3s) → H + + At + + e-

Table 4 (Theory)

E, MeV σ 3s , 10 -16 cm 2
JO79
0.005 .5064E-11
0.007 .1780E-10
0.01 .6537E-10
0.015 .2684E-09
0.02 .6874E-09
0.03 .2279E-08
0.05 .7454E-08
0.07 .1212E-07
0.10 .1572E-07
0.15 .3687E-07
0.20 .1123E-06
0.30 .3692E-06
0.50 .7057E-06
0.70 .1186E-05
1.0 .3485E-05
1.5 .1055E-04
2.0 .1839E-04
3.0 .3069E-04
5.0 .4154E-04
7.0 .4328E-04
10. .4141E-04
15. .3582E-04
20. .3098E-04
30. .2424E-04
50. .1704E-04
70. .1327E-04
100. .1005E-04
150. .7198E-05
200. .5671E-05
300. .4035E-05
500. .2619E-05
700. .1963E-05
1000. .1442E-05
1500. .1006E-05
2000. .7817E-06

H + + At(nl=3p) → H + + At + + e-

Table 5 (Theory)

E, MeV σ 3p , 10 -16 cm 2
JO79
0.003 .2816E-12
0.005 .3588E-11
0.007 .1751E-10
0.01 .9087E-10
0.015 .5495E-09
0.02 .1854E-08
0.03 .9207E-08
0.05 .5320E-07
0.07 .1378E-06
0.10 .3116E-06
0.15 .6458E-06
0.20 .1046E-05
0.30 .2314E-05
0.50 .7422E-05
0.70 .1577E-04
1.0 .3225E-04
1.5 .6257E-04
2.0 .9005E-04
3.0 .1301E-03
5.0 .1660E-03
7.0 .1744E-03
10. .1685E-03
15. .1489E-03
20. .1306E-03
30. .1041E-03
50. .7450E-04
70. .5846E-04
100. .4470E-04
150. .3243E-04
200. .2570E-04
300. .1845E-04
500. .1206E-04
700. .9039E-05
1000. .6672E-05
1500. .4706E-05

H + + At(nl=3d) → H + + At + + e-

Table 6 (Theory)

E, MeV σ 3d , 10 -16 cm 2
JO79
0.003 .1000E-13
0.005 .1960E-12
0.007 .1376E-11
0.01 .1041E-10
0.015 .9891E-10
0.02 .4669E-09
0.03 .3867E-08
0.05 .4505E-07
0.07 .1977E-06
0.10 .8205E-06
0.15 .3316E-05
0.20 .7681E-05
0.30 .2015E-04
0.50 .4865E-04
0.70 .7738E-04
1.0 .1189E-03
1.5 .1857E-03
2.0 .2457E-03
3.0 .3373E-03
5.0 .4300E-03
7.0 .4573E-03
10. .4510E-03
15. .4057E-03
20. .3586E-03
30. .2863E-03
50. .2026E-03
70. .1577E-03
100. .1190E-03
150. .8557E-04
200. .6740E-04
300. .4802E-04
500. .3102E-04
700. .2323E-04
1000. .1701E-04
1500. .1194E-04