Isobutene (C4H8) Energy (eV) BEB (A^2) 9.50 0.000 10.00 0.080 10.50 0.163 11.00 0.247 11.50 0.331 12.00 0.422 12.50 0.543 13.00 0.670 13.50 0.838 14.00 1.042 14.50 1.259 15.00 1.473 15.50 1.732 16.00 2.016 16.50 2.296 17.00 2.571 17.50 2.841 18.00 3.114 18.50 3.385 19.00 3.649 19.50 3.906 20.00 4.156 20.50 4.397 21.00 4.631 21.50 4.857 22.00 5.076 22.50 5.287 23.00 5.495 23.50 5.700 24.00 5.898 26.00 6.644 28.00 7.324 30.00 7.926 32.00 8.479 34.00 8.965 36.00 9.392 38.00 9.766 40.00 10.093 45.00 10.740 50.00 11.194 55.00 11.504 60.00 11.707 65.00 11.829 70.00 11.889 75.00 11.902 80.00 11.879 85.00 11.828 90.00 11.756 95.00 11.667 100.00 11.566 105.00 11.456 110.00 11.339 115.00 11.217 120.00 11.091 125.00 10.964 130.00 10.834 135.00 10.705 140.00 10.575 145.00 10.447 150.00 10.319 160.00 10.067 170.00 9.823 180.00 9.586 190.00 9.357 200.00 9.138 210.00 8.926 220.00 8.724 230.00 8.529 240.00 8.343 250.00 8.164 300.00 7.371 350.00 6.722 400.00 6.183 450.00 5.727 500.00 5.338 550.00 5.001 600.00 4.706 650.00 4.447 700.00 4.216 750.00 4.010 800.00 3.824 850.00 3.656 900.00 3.503 950.00 3.363 1000.00 3.235 1100.00 3.007 1200.00 2.812 1300.00 2.641 1400.00 2.492 1500.00 2.359 1600.00 2.241 1700.00 2.135 1800.00 2.039 1900.00 1.952 2000.00 1.873 2100.00 1.800 2200.00 1.733 2300.00 1.671 2400.00 1.613 2500.00 1.560 2600.00 1.510 2700.00 1.464 2800.00 1.421 2900.00 1.380 3000.00 1.341 4000.00 1.054 5000.00 0.872